CA2245339C - Digital video receiving apparatus - Google Patents
Digital video receiving apparatus Download PDFInfo
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- CA2245339C CA2245339C CA 2245339 CA2245339A CA2245339C CA 2245339 C CA2245339 C CA 2245339C CA 2245339 CA2245339 CA 2245339 CA 2245339 A CA2245339 A CA 2245339A CA 2245339 C CA2245339 C CA 2245339C
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4347—Demultiplexing of several video streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
- H04N19/436—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation using parallelised computational arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
- H04N5/45—Picture in picture, e.g. displaying simultaneously another television channel in a region of the screen
Abstract
The present invention provides a digital video receiving apparatus for displaying a plurality of digital TV pictures on a plurality of receiving terminal apparatuses. The digital video receiving apparatus includes a tuner for extracting the received digital TV multiplexed signal, a demodulator for decoding the digital signals provided from the tuner, a demultiplexer for demultiplexing the multiplexed signals outputted from the demodulator to obtain a bit stream including a video signal, an audio signal and a data signal. The digital video receiving apparatus further includes a video decoder, an audio decoder and a data decoder for decoding signals outputted from the demultiplexer. The digital video receiving apparatus decodes the input multiplexed digital TV signal and outputs a video signal, an audio signal and a data signal corresponding to respective programs.
Description
DIGITAL VIDEO RECEIVING APPARATUS
Field of the Invention The present invention relates to a digital video receiving apparatus for receiving a digital video signal especially in relation to digital TV, digital CATV or a digital broadcasting device.
Description of the Prior A_rt FIG. 14 shows a multimedia information processing apparatus disclosed in "A
codec having broadcasting quality for satellite communication" , Hattori, Tanaka, Asano, Asai and Sakado, Mitsubishi Denki Technical Gazette, Vol. G7, No. 7, pp. 33 -38 (1993).
A conventional digital video receiving apparatus is explained using FIG. 13 and FIG. 14. FIG. 13 shows an example of a signal frequency layout on a satellite transponder having a two-wave transmission mode. In FIG. 13, a high picture quality mode means a mode for transmitting two-waves on a transponder and a higher quality video and audio. SNG (Satellite News Gathering) multiplex mode means a mode for multiplexing two programs of SNG mode, which can transmit a maximum of four waves via a transponder of a communication satellite "Super Bird" , and for transmitting two video programs via one wave. In FIG. 13, the two-waves are multiplexed and each wave multiplexes two programs.
When the two-waves shown in FIG. 13 are demultiplexed and received simultaneously, four program digital video receiving apparatuses 400 ( two apparatuses x two programs) (shown in FIG. 14) are necessary. In the high picture quality mode, one wave carries one program, but in the SNG multiplex mode two programs are carried in one wave as shown in FIG. 14. The decoding operation of the SNG multiplex mode is explained below.
In FIG. 14, a down converter 402 selects any one of SNG multiplexed waves 511 or 512 in FIG. 13 from a received IF (Intermediate Frequency) signal 401.
QPSK
demodulator 403 digitally demodulates the selected wave. A Viterbi decoder 404 corrects errors and a 2CH demultiplexer 410 demultiplexes the wave signal into two program signals. One of the program signals is corrected through a de-interleave portion 411, a Reed-Solomon decoder 412 and a de-scramble portion 413 and outputted to a demultiplexer 430.
The other program signal is demultiplexed by the 2CH demultiplexer 410 into a digital video output signal 422, which is inputted into the 2CH demultiplexer 410 of the other program digital video receiving apparatus 400 as a digital video input signal 421.
The output signal from the 2CH demultiplexer 410 of the other program digital video receiving apparatus 400 is also corrected through the circuits 41 l, 412 and 413 and outputted to the demultiplexer 430 in the same manner as described above.
Conventionally, one SNG multiplexed wave includes two programs. The respective SNG multiplexed wave is demultiplexed by the 2CH demultiplexer 410 into two programs, one ofwhich is outputted to the demultiplexer 430 and demultiplexed. A
video decoder 432 receives a VBI (vertical blanking line interval) signal 431 from the demultiplexer 430 and outputs a video signal 441 to a terminal. An audio decoder 433 decodes an audio coded signal received from the demultiplexer 430 to output an audio signal 422. Similarly, an order-wire-interface 434 outputs a communication signal 443 and a data-interface 435 outputs a terminal data signal 444.
Conventionally, only digitally coded programs can be received. Therefore, an analog video picture and a digital video picture cannot be received by the same receiving terminal apparatus.
A conventional digital video receiving terminal apparatus only can receive one digital video program. It cannot display a multi-channel digital video picture.
Also, the conventional digital video receiving terminal apparatus cannot display respective different digital video pictures on a plurality of terminals (monitors).
A data demultiplexer of the conventional digital video receiving terminal apparatus can only demultiplex data accompanying one program. It cannot demultiplex data corresponding to a plurality of digital video programs.
For example, when the computing requirement for decoding HDTV (High Definition Television) of a high picture quality digital TV is six times as much as that for SDTV (Standard Definition Television) of a normal digital TV, a data decoder of the conventional digital video receiving terminal apparatus can decode one HDTV
picture or one SDTV picture, but it cannot decode a plurality of SDTV pictures, simultaneously, or a plurality of SDTV pictures plus one HDTV picture, simultaneously.
SUMMARY OF THE INVENTION
According to one aspect of the invention, there is provided a digital video receiving apparatus for receiving digital broadcasting programs including a plurality of multiplexed media such as video, audio and data, and providing the programs to subscribers. The apparatus includes a tuner for receiving a multiplexed signal and converting it to a digital base band signal and a demodulator for decoding the digital base band signal provided from the tuner. The apparatus further includes a demultiplexer for selecting one or more programs from the multiplexed programs including a plurality of media such as a video signal, an audio signal and a data signal according to a program selection signal provided from outside, and for demultiplexing respective bit streams including a video signal, an audio signal or a data signal. The apparatus further includes a video decoder for decoding the video signal demultiplexed by the demultiplexer, an audio decoder for decoding the audio signal demultiplexed by the demultiplexer, and a data decoder for decoding the data signal demultiplexed by the demultiplexer.
According to one embodiment of the invention, the video decoder in the digital video receiving apparatus includes a bit stream divider and a plurality of video decoding units, each of the video decoding units including a partial video decoder and a memory.
The bit stream divider generates video streams including a video signal, an audio signal and a data signal for each channel, using a clock and a stream identification signal. Each video decoding unit decodes the respective video stream for each channel using the partial video decoder and the memory, and outputs the decoded signal a.s a video output signal.
According to a further embodiment of the invention, the digital video receiving apparatus further includes a channel demultiplexer for generating a video stream, a. clock 1 S signal and a stream identification signal for each channel, using a bit stream including a video signal, an audio signal and a data signal, a clock signal and a stream identification signal each of which is outputted from the demultiplexer. The video decoder, the audio decoder and the data decoder process the respective signals for each channel, decode and output the video signal, the audio signal and the data signal for each program.
According to a still further embodiment of the invention, the video decoder in the digital video receiving apparatus includes a plurality of video decoding units, each of the video decoding units including a partial video decoder and a memory. Each video decoding unit decodes the bit stream including a video signal, an audio signal and a data signal outputted from the channel demultiplexer, using a clock signal and a stream identification signal, and outputs a decoded signal as a video output signal.
According to another aspect of the invention, there is provided a digital video receiving apparatus for receiving digital broadcasting programs including a plurality of multiplexed media such as a video, audio and data, and providing the programs to subscribers. The digital video receiving apparatus includes a tuner for receiving a 5 multiplexed signal and converting it to a digital base band signal and a demodulator for decoding the digital base band signal provided from the tuner. The digital video receiving apparatus further includes a demultiplexer for demultiplexing and outputting a bit stream including a video signal, an audio signal and a data signal, a clock and a stream identification signal for each channel according to a selection signal, when a multiplexed signal is SDTV, and for demultiplexing and outputting a bit stream including a video signal, an audio signal and a data signal, a clock and a stream identification signal for each partial picture according to a selection signal, when the multiplexed signal is HDTV. The digital video receiving apparatus further includes a video decoder for decoding the video signal demultiplexed by the demultiplexer, an audio decoder for decoding the audio signal demultiplexed by the demultiplexer, a data decoder for decoding the data signal demultiplexed by the demultiplexer, a display synthesizer for synthesizing a plurality of the signals outputted from the video decoder and generating a video signal to display it on one monitor, an audio selector for selecting one of the audio signals outputted from the audio decoder, and a data selector for selecting one of the data signals outputted from the data decoder.
According to an embodiment of the invention, the video decoder in the digital video receiving apparatus includes a bit stream divider and a plurality of video decoding units, each of the video decoding units including a partial video decoder and a memory.
The bit stream divider generates video streams for each channel from the video signal outputted from the demultiplexer, according to the switching signal and each of the video decoding units decodes the video stream for each channel to output a video signal, G
when the multiplexed signal is SDTV. The bit stream divider further generates video streams for each partial picture from the video signal outputted from the demultiplexer, according to the switching signal and each of the video decoding units decodes the video stream for each partial picture to output a video signal, when the multiplexed signal is HDTV.
According to a further embodiment of the invention, the display synthesizer in the digital video receiving apparatus includes a plurality of enlarger/
reducer units and a screen overlay unit. The display synthesizer enlarges or reduces sizes of the decoded signals inputted from the video decoder, superposes a plurality of the enlarged or reduced video signals and generates a video signal to display on one monitor in the case of SDTV.
According to a further embodiment of the invention, the digital video receiving apparatus further includes an NTSC/ PAL decoder. The tuner branches a received multiplexed signal to an analog base band signal and a digital base band signal. The NTSC/ PAL decoder decodes the analog base band signal provided from the tuner to generate a decoding video signal. The display synthesizer synthesizes the analog video signal from the NTSC/ PAL decoder and the digital video signal from the video decoder, and generates a video signal to display the analog video signal and the digital video signal on one monitor.
According to a further embodiment of the invention, the display synthesizer in the digital video receiving apparatus includes a screen regenerator and a screen overlay unit. When no analog TV signal is inputted from the NTSC/ PAL decoder, the display synthesizer synthesizes the digital HDTV video signal received from the video decoder to generate a video signal to display on one monitor. When the analog TV
signal is inputted from the NTSC/ PAL decoder, the screen overlay unit superposes the HDTV
video signal and the analog TV signal and generates a video signal to display on one monitor.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood by the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention and wherein:
F1G. 1 shows a digital video receiving apparatus of a first embodiment of the present invention;
FIG. 2 shows a video decoder used in the digital video receiving apparatus of the first embodiment of the present invention;
F1G. 3 shows a plurality of monitors connected to the digital video receiving apparatus of the first embodiment of the present invention;
FIG. 4 shows a digital video receiving apparatus of a second embodiment of the present invention;
FIG. 5 shows a video decoder used in the digital video receiving apparatus of the second embodiment of the present invention;
FIG. 6 shows a digital video receiving apparatus of a third embodiment of the present invention;
FIG. 7 shows a video decoder used in the digital video receiving apparatus of the third embodiment of the present invention;
FIG. 8 shows a monitor which displays a plurality of SDTV pictures from the digital video receiving apparatus of the third embodiment of the present invention;
FIG. 9 shows a monitor which displays HDTV pictures from the digital video receiving apparatus of the third embodiment of the present invention;
g FIG. 10 shows a digital video receiving apparatus of a fourth embodiment of the present invention;
FIG. 1 I shows a monitor which displays one SDTV picture and one HDTV
picture from the digital video receiving apparatus of the fourth embodiment of the present invention on one monitor;
FIG. I 2 shows an example of multiplexed signals in the embodiments of the present invention;
FIG. 13, labelled PRIOR ART, shows an example of a conventional signal frequency layout on a satellite transponder;
FIG. 14, labelled PRIOR ART, shows an example of a conventional digital video receiving terminal apparatus.
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
Embodiment 1.
A digital video receiving apparatus of a first embodiment of the present invention is explained using FIGS. 1 - 3. FIG. 1 shows a schematic diagram of a digital video receiving apparatus of the first embodiment of the present invention. The digital video receiving apparatus of FIG. 1 includes an input terminal 111, a tuner 103, a demodulator 104, a demultiplexer 105, a video decoder 106, an audio decoder 107, a data decoder 108, a received input signal 149, a multiplexed signal 185, a program selection signal 1 S0, a video stream 153, a clock signal 154, a stream identification signal 155, video output signals (lS6a, 156b ... 156n), audio output signals (157a, 157b ...
157n), and data output signals (160a, 160b ... 160n).
The operation of the digital video receiving apparatus of the first embodiment of the present invention is explained. The received input signal is inputted to the input terminal 11 I and the necessary signal elements thereof are extracted in the tuner 103.
Then, the extracted signals are demodulated in the demodulator 104 and output as multiplexed signal 185 to the demultiplexer 105. The multiplexed signal 185 input to the demultiplexer 105 is a multiplexed signal in which a plurality of programs are coded and multiplexed to one stream. The multiplexed signal 185 includes a bit stream comprised of a plurality of programs as shown in FIG. 12. The multiplexed signal 185 in FIG. 12 includes n-channel video signals, n-channel audio signals and n-channel data signals. Headers of each of the video signals, audio signals and data signals include accompanying data such as a clock necessary for each channel.
The demultiplexer 105 demultiplexs a video signal, an audio signal and a data signal from the multiplexed signal 185 and extracts only coded data of a desired program by the program selection signal 150. For example, the demultiplexed video signal includes a video stream 153, a clock signal 154 corresponding to a program, and a stream identification signal 155 which is a control signal for extracting programs.
These demultiplexed video signals are outputted to the video decoder 106. The demultiplexed audio signal includes an audio stream signal 170, a clock signal corresponding to a program, and a stream identification signal 172 which is a control signal for extracting a program. These demultiplexed audio signals are outputted to an > audio decoder 107. On the other hand, the demultiplexed data signal includes a demultiplexed data signal 180, a clock signal 181 corresponding to a program, and a stream identification signal 182 which is a control signal for extracting a program. The demultiplexed data signals are outputted to the data decoder 108.
The video decoder 106 decodes each video stream using the input clock signal 10 corresponding to the program and the stream identification signal 155, and outputs decoded video signals (156a, 1566, ... 156n) for each program as video output signals.
The video decoder 106 in the digital video receiving apparatus of the first embodiment of the present invention is explained using FIG. 2. The video decoder of FIG. 2 includes a bit stream divider 201 for dividing input bit streams for each program, video decoders (202a, 2026, ... 202n) for each channel, partial video decoders (203a, 2036, ... 203n) for decoding video signals for each channel, memories (204a, 2046, ...
204n) for each channel which are used to decode video signals and video bit streams (250a, 2506, ... ZSOn) for each channel.
The video decoder 106 is explained using FIG. 2. The video stream 153 input to the video decoder 106 is divided into bit streams for each channel corresponding to programs using the stream identification signal 155. A bit stream 250a of an a-channel (CHa) is sent to the video decoding unit 202a, a bit stream 2506 of a b-channel (CHb) is sent to the video decoding unit 2026, a bit stream 250c of a c-channel (CHc) is sent to the video decoding unit 202c, and a bit stream 250n of an n-channel (CHn) is sent to the video decoding unit 202n.
The video decoders (202a, 202b, ... 202n) respectively have a video decoding ability of a conventional SDTV (Standard Definition TV) class. The video decoders (202a, 202b ... 202n) respectively decode respective video bit streams (250a, 250b, 250n) divided for each channel, and output them as video output signals (156a, 156b, ...
156n) for each channel. The video decoders (202a, 202b, ... 202n) carry out the video decoding according to the video clock 154 which is provided as a master clock.
The video decoders (202a, 202b, ... 202n) respectively decode video signals using respective internal partial video decoders (203a, 203b ... 203n) and memories (204a, 204b, ...
204n), and output respective video output signals (156a, 156b, ... 156n).
The audio decoder 107 decodes the inputted audio stream signal 170 and outputs decoded audio signals (157a, 157b, ... 157n) for each program as audio output signals.
The data decoder 108 similarly decodes the inputted data stream 180 and outputs decoded data signals (160x, 160b, ... 160n) for each program as data output signals.
FIG. 3 shows a plurality of monitors (332a, 332b, ... 332n) connected to the digital I 5 video receiving apparatus of the first embodiment of the present invention. Video output terminals (330a, 330b, ... 330n) are shown in FIG. 3. The video output terminal 330a includes the video output signal 156a, the audio output signal 157a and the data output signal 160a shown in FIG. 1. The video output terminal 330b includes the video output signal 156b, the audio output signal 157b and the data output signal 160b shown in FIG. 1. The video output terminal 330n includes the video output signal 156n, the audio output signal 157n and the data output signal 160n shown in FIG. I. In this way, each set of output signals from the video decoder 106, the audio decoder 107 and the data decoder 108 is outputted to each monitor. Each of video, audio and data can be reproduced on each monitor.
The decoded video signals (156a, 156b, ... 156n) outputted from the video decoder 106, the decoded audio signals ( 157a, 157b, ... 157n) outputted from the audio decoder 10'7 and the decoded data signals (160a, 160b, ... 160n) outputted from the data decoder 108 are outputted from the digital video receiving terminals as independent signals. Accordingly different pictures can be displayed on the different monitors by connecting the different monitors to the corresponding terminals of the digital video receiving apparatus.
Cmbodiment 2.
A digital video receiving apparatus of a second embodiment of the present invention is explained using FIG. 4. FIG. 4 shows a schematic diagram of the digital video receiving apparatus of the second embodiment of the present invention.
In the second embodiment, a multiplexed video stream is demultiplexed by a demultiplexer and also demultiplexed for each channel by a channel-demultiplexer 115. The demultiplexed signal for each channel is provided to a video decoder 106. The digital video receiving apparatus of FIG. 4 includes an input terminal 111, a tuner 103, a demodulator 104, a demultiplexer IOS, a video decoder 106, an audio decoder 107, a data decoder 108, a 1 S channel-demultiplexer 11 S, a multiplexed signal 18S, demultiplexed channel video streams (lS3a, lS3b, ... lS3n), demultiplexed channel clock signals (lS4a lS4b, ...
lS4n), video output signals (lS6a, lS6b, ... 156n), audio streams (170a, 170b, ... 170n), audio output signals (lS7a, 157b, ... lS7n), demultiplexed data signals (180a, 180b, ...
180n), and data output signals 160a, 160b, ... 160n).
The operation of the digital video receiving apparatus of the second embodiment of the present invention is explained using FIG. 4. A multiplexed digital signal is inputted to an input terminal 111 of the digital video receiving apparatus and the necessary signal elements thereof are extracted in the tuner 103. Then, the extracted signals are demodulated in the demodulator 104 and output as a multiplexed signal 18S
to the demultiplexer IOS. The multiplexed signal 18S input to the demultiplexer lOS
has the same construction as that of the stream of the first embodiment of the present invention.
The demultiplexer 105 generates a stream identification signal (not shown) for demultiplexing a video stream, a clock signal and a channel from the multiplexed signal 185. The channel-demultiplexer 1 I S generates demultiplexed channel video streams (153a, 153b, ... 153n) for each channel and demultiplexed Channel clock signals (154a, 154b, ... 154n) for each channel using the stream identification signal (not shown) generated by the demultiplexer 105. The video decoder 106 receives the demultiplexed channel video streams (153a, 153b, ... 153n) corresponding to the programs and decodes them using the demultiplexed channel clock signals (154a, 154b, ...
154n). The video decoder 106 outputs the decoded video signals ( 156a, 156b, ... 156n) as video output signals.
The audio decoder 107 receives audio streams (170a, 170b, ... 170n) corresponding to the programs and decodes them. The audio decoder 107 outputs I S decoded audio signals (157a, 157b, ... 157n) for each program as audio output signals.
The data decoder 108 similarly receives data streams (180a, 180b, ... 180n) corresponding to the programs and decodes them. The data decoder 108 outputs decoded data signals (160a, 160b, ... 160n) for each program as data output signals.
Each set of output signals from the video decoder 106, the audio decoder 107 and the data decoder 108 is outputted to each monitor. Each video, audio and data can be reproduced on each monitor in the same manner shown in the first embodiment of F1G.
J.
The decoded video signals ( 156a, 156b, ... 156n) outputted from the video decoder 106, the decoded audio signals (157a, 157b, ... 157n) outputted from the audio decoder 107 and the decoded data signals (160a, 160b, ... 160n) outputted from the data decoder 108 are outputted from the digital video receiving terminals as independent signals. Accordingly different pictures can be displayed on the different monitors by connecting the different monitors to the corresponding terminals of the digital video receiving apparatus.
The video decoder 106 in the digital video receiving apparatus of the second embodiment of the present invention is explained using FIG. 5. In FIG. 5, the input signal to the video decoder 106 is not an n-channel multiplexed video signal, but it is a demultiplexed video signal for each channel, which is different from tlae video decoder 106 of the first embodiment of the present invention. The video decoder I 06 of FIG. 5 includes video decoders (202a, 202b, ... 202n), video decoders (203a, 203b, ... 203n) for each channel and memories (204a, 204b, ... 204n), each corresponding to the video decoders (202a, 202b, ... 202n).
The video stream 153a, the clock signal 154a and the stream identification signal 155a are input to the video decoding unit 202a and decoded therein. Since the operation of the video decoding unit 202a is the same as that of the first embodiment shown in FIG. 3, the detailed description thereof is omitted. Similarly, other video decoders (202a, 202b, ... 202n) also output decoded video signals (156a, 156b, ...
156n), respectively. The different pictures for each channel can be reproduced by connecting the decoded video signals (156a, 156b, ... 156n) to the respective monitors.
Embodiment 3.
A digital video receiving apparatus of a third embodiment of the present invention is explained using FIG. 6. FIG. 6 shows a schematic diagram of the digital video receiving apparatus of the third embodiment of the present invention. The digital video receiving apparatus of FIG. 6 includes an input terminal 111, a tuner 103, a demodulator 104, a demultiplexer 105, a video decoder 106, an audio decoder 107, a data decoder 108, a display synthesizer 109, an audio selector 110, a data selector 1 16, a selection signal 148, a video stream 153, a clock signal 154, a stream identification signal 155, decoded video signals (156a, 156b, ... 156n), decoded audio signals (157a, 157b, ...
157n), a video output signal 158, an audio output signal 159, decoded data signals (160a, 160b, ... 160n), a data output signal 161 and a multiplexed signal 185.
5 The operation of the digital video receiving apparatus of the third embodiment of the present invention is explained using FIG. 6. A multiplexed digital signal is inputted to the input terminal 111 of the digital video receiving apparatus and the desired signal elements thereof are extracted in the tuner 103. The extracted digital signals are demodulated by the demodulator 104 and inputted to the demultiplexer 105. In the 10 digital video receiving apparatus in the first and the second embodiments of the present invention, only normal SDTV signals are input to the input terminal 1 1 I. On the other hand, in the digital video receiving apparatus of the third embodiment of the present invention, a HDTV signal or both SDTV signals and a HDTV signal are input to the input terminal 111. In the case of SDTV, processing from the tuner 103 to the video 15 decoder 106 is similar to that of the digital video receiving apparatus described of the first embodiment of the present invention. In HDTV, however, since the bandwidth of the signal is broader, each video decoder 106 cannot decode all bandwidth of the HDTV
signals at once. Therefore, the HDTV signal is divided into a plurality of partial signals corresponding to a plurality of pictures. The partial video decoders (203a, 203b, ...
203n) in the video decoder 106 decode the respective divided partial signals (250a, 250b, ... 250n) and regenerate HDTV by synthesizing the decoded signals (156a, 156b, ... 156n). The partial video decoders (203a, 203b, ... 203n) operate in the same way as the partial video decoders (203a, 203b, ... 203n) in the first embodiment.
The operation of the video decoder 106 is explained in the case that SDTV
signals and a HDTV signal are input therein using FIG. 7. A switching signal 205 switches the dividing mode according to whether the bit stream 153 inputted to a bit stream divider 201 is the conventional SDTV(Standard Definition TV) or HDTV (High Definition TV). The switching signal 205 may be generated within the bit stream divider according to the kind of the video stream 153.
In the case of DTV
The operation of the video decoder 106 is explained in the case that the SDTV
signals are input therein. In the bit stream divider 201, the video stream 153, the clock signal 154 and the stream identification signal 155 are divided for each channel and axe sent to respective video decoders (202a, 202b, ... 202n). Respective video decoders (202a, 202b, ... 202n) output respective decoded video signals (156a, 156b, ... 156n).
Since the method for generating the decoded video signals is similar to that of the first embodiment, the explanation thereof is omitted.
In the case of HDTV' The operation of the video decoder 106 is explained in the case that HDTV is inputted therein. The HDTV signal inputted into the video decoder 106 is divided into each partial video signal corresponding to each partial picture based on the video stream 153, the clock signal 154 and the stream identification signal 155, and the respective divided partial video signal are sent to respective video decoders (202a, 202b, ... 202n).
The partial video decoders (203a, 203b, ... 203n) in the respective video decoders (202a, 202b, ... 202n) decode each partial video signal. If data from adjacent video decoders (202a, 202b, ... 202n) are needed for decoding, respective video decoders (202a, 202b, ... 202n) decode the signals using inter-video decoder connection lines (255a, 255b, ... 255n) and memories (204a, 204b, ... 204n), and output decoded signals (156a, 156b, ... 156n).
The decoded signals (156a, 156b, ... 156n) outputted from the video decoder are input to the display synthesizer 109 as shown in FIG. 6. The display synthesizer 109 synthesizes the video output signals (156a, 156b, ... 156n) and a plurality of partial pictures are displayed on a monitor. Examples thereof are shown in FIG. 8 and FIG. 9.
In the case of a lurality of SDTV si_g;nals~
FIG. 8 shows an example for displaying a plurality of SDTV decoded signals on a monitor. A display synthesizer 109 of FIG. 8 includes enlarger/ reducer units (310a, 310b, ... 310n), and a screen overlay unit 302. In FIG. 8, the respective decoded video signals (156a, 156b, ... 156n) received from the video decoder 106 are input to the enlarger/ reducer units(310a, 3 lOb, ... 3 l On) for each channel. The respective decoded video signals (156a, 156b, ... 156n) are enlarged or reduced to desired sizes according to a plurality of screen sizes in the monitor 332. Then, the enlarged or reduced signals are synthesized in the screen overlay unit 302 and outputted to the monitor 332 as a synthesized signal 352. As a result, a plurality of pictures corresponding to respective channels are displayed on a monitor 332.
In the case of a I-IDTV signal FIG. 9 shows an example for enlarging/ reducing the divided decoded video signals, and synthesizing them to display a HDTV picture on a monitor. A
display synthesizer 109 of FIG. 9 includes enlarger/ reducer units (3 I Oa, 31 Ob, ...
Field of the Invention The present invention relates to a digital video receiving apparatus for receiving a digital video signal especially in relation to digital TV, digital CATV or a digital broadcasting device.
Description of the Prior A_rt FIG. 14 shows a multimedia information processing apparatus disclosed in "A
codec having broadcasting quality for satellite communication" , Hattori, Tanaka, Asano, Asai and Sakado, Mitsubishi Denki Technical Gazette, Vol. G7, No. 7, pp. 33 -38 (1993).
A conventional digital video receiving apparatus is explained using FIG. 13 and FIG. 14. FIG. 13 shows an example of a signal frequency layout on a satellite transponder having a two-wave transmission mode. In FIG. 13, a high picture quality mode means a mode for transmitting two-waves on a transponder and a higher quality video and audio. SNG (Satellite News Gathering) multiplex mode means a mode for multiplexing two programs of SNG mode, which can transmit a maximum of four waves via a transponder of a communication satellite "Super Bird" , and for transmitting two video programs via one wave. In FIG. 13, the two-waves are multiplexed and each wave multiplexes two programs.
When the two-waves shown in FIG. 13 are demultiplexed and received simultaneously, four program digital video receiving apparatuses 400 ( two apparatuses x two programs) (shown in FIG. 14) are necessary. In the high picture quality mode, one wave carries one program, but in the SNG multiplex mode two programs are carried in one wave as shown in FIG. 14. The decoding operation of the SNG multiplex mode is explained below.
In FIG. 14, a down converter 402 selects any one of SNG multiplexed waves 511 or 512 in FIG. 13 from a received IF (Intermediate Frequency) signal 401.
QPSK
demodulator 403 digitally demodulates the selected wave. A Viterbi decoder 404 corrects errors and a 2CH demultiplexer 410 demultiplexes the wave signal into two program signals. One of the program signals is corrected through a de-interleave portion 411, a Reed-Solomon decoder 412 and a de-scramble portion 413 and outputted to a demultiplexer 430.
The other program signal is demultiplexed by the 2CH demultiplexer 410 into a digital video output signal 422, which is inputted into the 2CH demultiplexer 410 of the other program digital video receiving apparatus 400 as a digital video input signal 421.
The output signal from the 2CH demultiplexer 410 of the other program digital video receiving apparatus 400 is also corrected through the circuits 41 l, 412 and 413 and outputted to the demultiplexer 430 in the same manner as described above.
Conventionally, one SNG multiplexed wave includes two programs. The respective SNG multiplexed wave is demultiplexed by the 2CH demultiplexer 410 into two programs, one ofwhich is outputted to the demultiplexer 430 and demultiplexed. A
video decoder 432 receives a VBI (vertical blanking line interval) signal 431 from the demultiplexer 430 and outputs a video signal 441 to a terminal. An audio decoder 433 decodes an audio coded signal received from the demultiplexer 430 to output an audio signal 422. Similarly, an order-wire-interface 434 outputs a communication signal 443 and a data-interface 435 outputs a terminal data signal 444.
Conventionally, only digitally coded programs can be received. Therefore, an analog video picture and a digital video picture cannot be received by the same receiving terminal apparatus.
A conventional digital video receiving terminal apparatus only can receive one digital video program. It cannot display a multi-channel digital video picture.
Also, the conventional digital video receiving terminal apparatus cannot display respective different digital video pictures on a plurality of terminals (monitors).
A data demultiplexer of the conventional digital video receiving terminal apparatus can only demultiplex data accompanying one program. It cannot demultiplex data corresponding to a plurality of digital video programs.
For example, when the computing requirement for decoding HDTV (High Definition Television) of a high picture quality digital TV is six times as much as that for SDTV (Standard Definition Television) of a normal digital TV, a data decoder of the conventional digital video receiving terminal apparatus can decode one HDTV
picture or one SDTV picture, but it cannot decode a plurality of SDTV pictures, simultaneously, or a plurality of SDTV pictures plus one HDTV picture, simultaneously.
SUMMARY OF THE INVENTION
According to one aspect of the invention, there is provided a digital video receiving apparatus for receiving digital broadcasting programs including a plurality of multiplexed media such as video, audio and data, and providing the programs to subscribers. The apparatus includes a tuner for receiving a multiplexed signal and converting it to a digital base band signal and a demodulator for decoding the digital base band signal provided from the tuner. The apparatus further includes a demultiplexer for selecting one or more programs from the multiplexed programs including a plurality of media such as a video signal, an audio signal and a data signal according to a program selection signal provided from outside, and for demultiplexing respective bit streams including a video signal, an audio signal or a data signal. The apparatus further includes a video decoder for decoding the video signal demultiplexed by the demultiplexer, an audio decoder for decoding the audio signal demultiplexed by the demultiplexer, and a data decoder for decoding the data signal demultiplexed by the demultiplexer.
According to one embodiment of the invention, the video decoder in the digital video receiving apparatus includes a bit stream divider and a plurality of video decoding units, each of the video decoding units including a partial video decoder and a memory.
The bit stream divider generates video streams including a video signal, an audio signal and a data signal for each channel, using a clock and a stream identification signal. Each video decoding unit decodes the respective video stream for each channel using the partial video decoder and the memory, and outputs the decoded signal a.s a video output signal.
According to a further embodiment of the invention, the digital video receiving apparatus further includes a channel demultiplexer for generating a video stream, a. clock 1 S signal and a stream identification signal for each channel, using a bit stream including a video signal, an audio signal and a data signal, a clock signal and a stream identification signal each of which is outputted from the demultiplexer. The video decoder, the audio decoder and the data decoder process the respective signals for each channel, decode and output the video signal, the audio signal and the data signal for each program.
According to a still further embodiment of the invention, the video decoder in the digital video receiving apparatus includes a plurality of video decoding units, each of the video decoding units including a partial video decoder and a memory. Each video decoding unit decodes the bit stream including a video signal, an audio signal and a data signal outputted from the channel demultiplexer, using a clock signal and a stream identification signal, and outputs a decoded signal as a video output signal.
According to another aspect of the invention, there is provided a digital video receiving apparatus for receiving digital broadcasting programs including a plurality of multiplexed media such as a video, audio and data, and providing the programs to subscribers. The digital video receiving apparatus includes a tuner for receiving a 5 multiplexed signal and converting it to a digital base band signal and a demodulator for decoding the digital base band signal provided from the tuner. The digital video receiving apparatus further includes a demultiplexer for demultiplexing and outputting a bit stream including a video signal, an audio signal and a data signal, a clock and a stream identification signal for each channel according to a selection signal, when a multiplexed signal is SDTV, and for demultiplexing and outputting a bit stream including a video signal, an audio signal and a data signal, a clock and a stream identification signal for each partial picture according to a selection signal, when the multiplexed signal is HDTV. The digital video receiving apparatus further includes a video decoder for decoding the video signal demultiplexed by the demultiplexer, an audio decoder for decoding the audio signal demultiplexed by the demultiplexer, a data decoder for decoding the data signal demultiplexed by the demultiplexer, a display synthesizer for synthesizing a plurality of the signals outputted from the video decoder and generating a video signal to display it on one monitor, an audio selector for selecting one of the audio signals outputted from the audio decoder, and a data selector for selecting one of the data signals outputted from the data decoder.
According to an embodiment of the invention, the video decoder in the digital video receiving apparatus includes a bit stream divider and a plurality of video decoding units, each of the video decoding units including a partial video decoder and a memory.
The bit stream divider generates video streams for each channel from the video signal outputted from the demultiplexer, according to the switching signal and each of the video decoding units decodes the video stream for each channel to output a video signal, G
when the multiplexed signal is SDTV. The bit stream divider further generates video streams for each partial picture from the video signal outputted from the demultiplexer, according to the switching signal and each of the video decoding units decodes the video stream for each partial picture to output a video signal, when the multiplexed signal is HDTV.
According to a further embodiment of the invention, the display synthesizer in the digital video receiving apparatus includes a plurality of enlarger/
reducer units and a screen overlay unit. The display synthesizer enlarges or reduces sizes of the decoded signals inputted from the video decoder, superposes a plurality of the enlarged or reduced video signals and generates a video signal to display on one monitor in the case of SDTV.
According to a further embodiment of the invention, the digital video receiving apparatus further includes an NTSC/ PAL decoder. The tuner branches a received multiplexed signal to an analog base band signal and a digital base band signal. The NTSC/ PAL decoder decodes the analog base band signal provided from the tuner to generate a decoding video signal. The display synthesizer synthesizes the analog video signal from the NTSC/ PAL decoder and the digital video signal from the video decoder, and generates a video signal to display the analog video signal and the digital video signal on one monitor.
According to a further embodiment of the invention, the display synthesizer in the digital video receiving apparatus includes a screen regenerator and a screen overlay unit. When no analog TV signal is inputted from the NTSC/ PAL decoder, the display synthesizer synthesizes the digital HDTV video signal received from the video decoder to generate a video signal to display on one monitor. When the analog TV
signal is inputted from the NTSC/ PAL decoder, the screen overlay unit superposes the HDTV
video signal and the analog TV signal and generates a video signal to display on one monitor.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood by the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention and wherein:
F1G. 1 shows a digital video receiving apparatus of a first embodiment of the present invention;
FIG. 2 shows a video decoder used in the digital video receiving apparatus of the first embodiment of the present invention;
F1G. 3 shows a plurality of monitors connected to the digital video receiving apparatus of the first embodiment of the present invention;
FIG. 4 shows a digital video receiving apparatus of a second embodiment of the present invention;
FIG. 5 shows a video decoder used in the digital video receiving apparatus of the second embodiment of the present invention;
FIG. 6 shows a digital video receiving apparatus of a third embodiment of the present invention;
FIG. 7 shows a video decoder used in the digital video receiving apparatus of the third embodiment of the present invention;
FIG. 8 shows a monitor which displays a plurality of SDTV pictures from the digital video receiving apparatus of the third embodiment of the present invention;
FIG. 9 shows a monitor which displays HDTV pictures from the digital video receiving apparatus of the third embodiment of the present invention;
g FIG. 10 shows a digital video receiving apparatus of a fourth embodiment of the present invention;
FIG. 1 I shows a monitor which displays one SDTV picture and one HDTV
picture from the digital video receiving apparatus of the fourth embodiment of the present invention on one monitor;
FIG. I 2 shows an example of multiplexed signals in the embodiments of the present invention;
FIG. 13, labelled PRIOR ART, shows an example of a conventional signal frequency layout on a satellite transponder;
FIG. 14, labelled PRIOR ART, shows an example of a conventional digital video receiving terminal apparatus.
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
Embodiment 1.
A digital video receiving apparatus of a first embodiment of the present invention is explained using FIGS. 1 - 3. FIG. 1 shows a schematic diagram of a digital video receiving apparatus of the first embodiment of the present invention. The digital video receiving apparatus of FIG. 1 includes an input terminal 111, a tuner 103, a demodulator 104, a demultiplexer 105, a video decoder 106, an audio decoder 107, a data decoder 108, a received input signal 149, a multiplexed signal 185, a program selection signal 1 S0, a video stream 153, a clock signal 154, a stream identification signal 155, video output signals (lS6a, 156b ... 156n), audio output signals (157a, 157b ...
157n), and data output signals (160a, 160b ... 160n).
The operation of the digital video receiving apparatus of the first embodiment of the present invention is explained. The received input signal is inputted to the input terminal 11 I and the necessary signal elements thereof are extracted in the tuner 103.
Then, the extracted signals are demodulated in the demodulator 104 and output as multiplexed signal 185 to the demultiplexer 105. The multiplexed signal 185 input to the demultiplexer 105 is a multiplexed signal in which a plurality of programs are coded and multiplexed to one stream. The multiplexed signal 185 includes a bit stream comprised of a plurality of programs as shown in FIG. 12. The multiplexed signal 185 in FIG. 12 includes n-channel video signals, n-channel audio signals and n-channel data signals. Headers of each of the video signals, audio signals and data signals include accompanying data such as a clock necessary for each channel.
The demultiplexer 105 demultiplexs a video signal, an audio signal and a data signal from the multiplexed signal 185 and extracts only coded data of a desired program by the program selection signal 150. For example, the demultiplexed video signal includes a video stream 153, a clock signal 154 corresponding to a program, and a stream identification signal 155 which is a control signal for extracting programs.
These demultiplexed video signals are outputted to the video decoder 106. The demultiplexed audio signal includes an audio stream signal 170, a clock signal corresponding to a program, and a stream identification signal 172 which is a control signal for extracting a program. These demultiplexed audio signals are outputted to an > audio decoder 107. On the other hand, the demultiplexed data signal includes a demultiplexed data signal 180, a clock signal 181 corresponding to a program, and a stream identification signal 182 which is a control signal for extracting a program. The demultiplexed data signals are outputted to the data decoder 108.
The video decoder 106 decodes each video stream using the input clock signal 10 corresponding to the program and the stream identification signal 155, and outputs decoded video signals (156a, 1566, ... 156n) for each program as video output signals.
The video decoder 106 in the digital video receiving apparatus of the first embodiment of the present invention is explained using FIG. 2. The video decoder of FIG. 2 includes a bit stream divider 201 for dividing input bit streams for each program, video decoders (202a, 2026, ... 202n) for each channel, partial video decoders (203a, 2036, ... 203n) for decoding video signals for each channel, memories (204a, 2046, ...
204n) for each channel which are used to decode video signals and video bit streams (250a, 2506, ... ZSOn) for each channel.
The video decoder 106 is explained using FIG. 2. The video stream 153 input to the video decoder 106 is divided into bit streams for each channel corresponding to programs using the stream identification signal 155. A bit stream 250a of an a-channel (CHa) is sent to the video decoding unit 202a, a bit stream 2506 of a b-channel (CHb) is sent to the video decoding unit 2026, a bit stream 250c of a c-channel (CHc) is sent to the video decoding unit 202c, and a bit stream 250n of an n-channel (CHn) is sent to the video decoding unit 202n.
The video decoders (202a, 202b, ... 202n) respectively have a video decoding ability of a conventional SDTV (Standard Definition TV) class. The video decoders (202a, 202b ... 202n) respectively decode respective video bit streams (250a, 250b, 250n) divided for each channel, and output them as video output signals (156a, 156b, ...
156n) for each channel. The video decoders (202a, 202b, ... 202n) carry out the video decoding according to the video clock 154 which is provided as a master clock.
The video decoders (202a, 202b, ... 202n) respectively decode video signals using respective internal partial video decoders (203a, 203b ... 203n) and memories (204a, 204b, ...
204n), and output respective video output signals (156a, 156b, ... 156n).
The audio decoder 107 decodes the inputted audio stream signal 170 and outputs decoded audio signals (157a, 157b, ... 157n) for each program as audio output signals.
The data decoder 108 similarly decodes the inputted data stream 180 and outputs decoded data signals (160x, 160b, ... 160n) for each program as data output signals.
FIG. 3 shows a plurality of monitors (332a, 332b, ... 332n) connected to the digital I 5 video receiving apparatus of the first embodiment of the present invention. Video output terminals (330a, 330b, ... 330n) are shown in FIG. 3. The video output terminal 330a includes the video output signal 156a, the audio output signal 157a and the data output signal 160a shown in FIG. 1. The video output terminal 330b includes the video output signal 156b, the audio output signal 157b and the data output signal 160b shown in FIG. 1. The video output terminal 330n includes the video output signal 156n, the audio output signal 157n and the data output signal 160n shown in FIG. I. In this way, each set of output signals from the video decoder 106, the audio decoder 107 and the data decoder 108 is outputted to each monitor. Each of video, audio and data can be reproduced on each monitor.
The decoded video signals (156a, 156b, ... 156n) outputted from the video decoder 106, the decoded audio signals ( 157a, 157b, ... 157n) outputted from the audio decoder 10'7 and the decoded data signals (160a, 160b, ... 160n) outputted from the data decoder 108 are outputted from the digital video receiving terminals as independent signals. Accordingly different pictures can be displayed on the different monitors by connecting the different monitors to the corresponding terminals of the digital video receiving apparatus.
Cmbodiment 2.
A digital video receiving apparatus of a second embodiment of the present invention is explained using FIG. 4. FIG. 4 shows a schematic diagram of the digital video receiving apparatus of the second embodiment of the present invention.
In the second embodiment, a multiplexed video stream is demultiplexed by a demultiplexer and also demultiplexed for each channel by a channel-demultiplexer 115. The demultiplexed signal for each channel is provided to a video decoder 106. The digital video receiving apparatus of FIG. 4 includes an input terminal 111, a tuner 103, a demodulator 104, a demultiplexer IOS, a video decoder 106, an audio decoder 107, a data decoder 108, a 1 S channel-demultiplexer 11 S, a multiplexed signal 18S, demultiplexed channel video streams (lS3a, lS3b, ... lS3n), demultiplexed channel clock signals (lS4a lS4b, ...
lS4n), video output signals (lS6a, lS6b, ... 156n), audio streams (170a, 170b, ... 170n), audio output signals (lS7a, 157b, ... lS7n), demultiplexed data signals (180a, 180b, ...
180n), and data output signals 160a, 160b, ... 160n).
The operation of the digital video receiving apparatus of the second embodiment of the present invention is explained using FIG. 4. A multiplexed digital signal is inputted to an input terminal 111 of the digital video receiving apparatus and the necessary signal elements thereof are extracted in the tuner 103. Then, the extracted signals are demodulated in the demodulator 104 and output as a multiplexed signal 18S
to the demultiplexer IOS. The multiplexed signal 18S input to the demultiplexer lOS
has the same construction as that of the stream of the first embodiment of the present invention.
The demultiplexer 105 generates a stream identification signal (not shown) for demultiplexing a video stream, a clock signal and a channel from the multiplexed signal 185. The channel-demultiplexer 1 I S generates demultiplexed channel video streams (153a, 153b, ... 153n) for each channel and demultiplexed Channel clock signals (154a, 154b, ... 154n) for each channel using the stream identification signal (not shown) generated by the demultiplexer 105. The video decoder 106 receives the demultiplexed channel video streams (153a, 153b, ... 153n) corresponding to the programs and decodes them using the demultiplexed channel clock signals (154a, 154b, ...
154n). The video decoder 106 outputs the decoded video signals ( 156a, 156b, ... 156n) as video output signals.
The audio decoder 107 receives audio streams (170a, 170b, ... 170n) corresponding to the programs and decodes them. The audio decoder 107 outputs I S decoded audio signals (157a, 157b, ... 157n) for each program as audio output signals.
The data decoder 108 similarly receives data streams (180a, 180b, ... 180n) corresponding to the programs and decodes them. The data decoder 108 outputs decoded data signals (160a, 160b, ... 160n) for each program as data output signals.
Each set of output signals from the video decoder 106, the audio decoder 107 and the data decoder 108 is outputted to each monitor. Each video, audio and data can be reproduced on each monitor in the same manner shown in the first embodiment of F1G.
J.
The decoded video signals ( 156a, 156b, ... 156n) outputted from the video decoder 106, the decoded audio signals (157a, 157b, ... 157n) outputted from the audio decoder 107 and the decoded data signals (160a, 160b, ... 160n) outputted from the data decoder 108 are outputted from the digital video receiving terminals as independent signals. Accordingly different pictures can be displayed on the different monitors by connecting the different monitors to the corresponding terminals of the digital video receiving apparatus.
The video decoder 106 in the digital video receiving apparatus of the second embodiment of the present invention is explained using FIG. 5. In FIG. 5, the input signal to the video decoder 106 is not an n-channel multiplexed video signal, but it is a demultiplexed video signal for each channel, which is different from tlae video decoder 106 of the first embodiment of the present invention. The video decoder I 06 of FIG. 5 includes video decoders (202a, 202b, ... 202n), video decoders (203a, 203b, ... 203n) for each channel and memories (204a, 204b, ... 204n), each corresponding to the video decoders (202a, 202b, ... 202n).
The video stream 153a, the clock signal 154a and the stream identification signal 155a are input to the video decoding unit 202a and decoded therein. Since the operation of the video decoding unit 202a is the same as that of the first embodiment shown in FIG. 3, the detailed description thereof is omitted. Similarly, other video decoders (202a, 202b, ... 202n) also output decoded video signals (156a, 156b, ...
156n), respectively. The different pictures for each channel can be reproduced by connecting the decoded video signals (156a, 156b, ... 156n) to the respective monitors.
Embodiment 3.
A digital video receiving apparatus of a third embodiment of the present invention is explained using FIG. 6. FIG. 6 shows a schematic diagram of the digital video receiving apparatus of the third embodiment of the present invention. The digital video receiving apparatus of FIG. 6 includes an input terminal 111, a tuner 103, a demodulator 104, a demultiplexer 105, a video decoder 106, an audio decoder 107, a data decoder 108, a display synthesizer 109, an audio selector 110, a data selector 1 16, a selection signal 148, a video stream 153, a clock signal 154, a stream identification signal 155, decoded video signals (156a, 156b, ... 156n), decoded audio signals (157a, 157b, ...
157n), a video output signal 158, an audio output signal 159, decoded data signals (160a, 160b, ... 160n), a data output signal 161 and a multiplexed signal 185.
5 The operation of the digital video receiving apparatus of the third embodiment of the present invention is explained using FIG. 6. A multiplexed digital signal is inputted to the input terminal 111 of the digital video receiving apparatus and the desired signal elements thereof are extracted in the tuner 103. The extracted digital signals are demodulated by the demodulator 104 and inputted to the demultiplexer 105. In the 10 digital video receiving apparatus in the first and the second embodiments of the present invention, only normal SDTV signals are input to the input terminal 1 1 I. On the other hand, in the digital video receiving apparatus of the third embodiment of the present invention, a HDTV signal or both SDTV signals and a HDTV signal are input to the input terminal 111. In the case of SDTV, processing from the tuner 103 to the video 15 decoder 106 is similar to that of the digital video receiving apparatus described of the first embodiment of the present invention. In HDTV, however, since the bandwidth of the signal is broader, each video decoder 106 cannot decode all bandwidth of the HDTV
signals at once. Therefore, the HDTV signal is divided into a plurality of partial signals corresponding to a plurality of pictures. The partial video decoders (203a, 203b, ...
203n) in the video decoder 106 decode the respective divided partial signals (250a, 250b, ... 250n) and regenerate HDTV by synthesizing the decoded signals (156a, 156b, ... 156n). The partial video decoders (203a, 203b, ... 203n) operate in the same way as the partial video decoders (203a, 203b, ... 203n) in the first embodiment.
The operation of the video decoder 106 is explained in the case that SDTV
signals and a HDTV signal are input therein using FIG. 7. A switching signal 205 switches the dividing mode according to whether the bit stream 153 inputted to a bit stream divider 201 is the conventional SDTV(Standard Definition TV) or HDTV (High Definition TV). The switching signal 205 may be generated within the bit stream divider according to the kind of the video stream 153.
In the case of DTV
The operation of the video decoder 106 is explained in the case that the SDTV
signals are input therein. In the bit stream divider 201, the video stream 153, the clock signal 154 and the stream identification signal 155 are divided for each channel and axe sent to respective video decoders (202a, 202b, ... 202n). Respective video decoders (202a, 202b, ... 202n) output respective decoded video signals (156a, 156b, ... 156n).
Since the method for generating the decoded video signals is similar to that of the first embodiment, the explanation thereof is omitted.
In the case of HDTV' The operation of the video decoder 106 is explained in the case that HDTV is inputted therein. The HDTV signal inputted into the video decoder 106 is divided into each partial video signal corresponding to each partial picture based on the video stream 153, the clock signal 154 and the stream identification signal 155, and the respective divided partial video signal are sent to respective video decoders (202a, 202b, ... 202n).
The partial video decoders (203a, 203b, ... 203n) in the respective video decoders (202a, 202b, ... 202n) decode each partial video signal. If data from adjacent video decoders (202a, 202b, ... 202n) are needed for decoding, respective video decoders (202a, 202b, ... 202n) decode the signals using inter-video decoder connection lines (255a, 255b, ... 255n) and memories (204a, 204b, ... 204n), and output decoded signals (156a, 156b, ... 156n).
The decoded signals (156a, 156b, ... 156n) outputted from the video decoder are input to the display synthesizer 109 as shown in FIG. 6. The display synthesizer 109 synthesizes the video output signals (156a, 156b, ... 156n) and a plurality of partial pictures are displayed on a monitor. Examples thereof are shown in FIG. 8 and FIG. 9.
In the case of a lurality of SDTV si_g;nals~
FIG. 8 shows an example for displaying a plurality of SDTV decoded signals on a monitor. A display synthesizer 109 of FIG. 8 includes enlarger/ reducer units (310a, 310b, ... 310n), and a screen overlay unit 302. In FIG. 8, the respective decoded video signals (156a, 156b, ... 156n) received from the video decoder 106 are input to the enlarger/ reducer units(310a, 3 lOb, ... 3 l On) for each channel. The respective decoded video signals (156a, 156b, ... 156n) are enlarged or reduced to desired sizes according to a plurality of screen sizes in the monitor 332. Then, the enlarged or reduced signals are synthesized in the screen overlay unit 302 and outputted to the monitor 332 as a synthesized signal 352. As a result, a plurality of pictures corresponding to respective channels are displayed on a monitor 332.
In the case of a I-IDTV signal FIG. 9 shows an example for enlarging/ reducing the divided decoded video signals, and synthesizing them to display a HDTV picture on a monitor. A
display synthesizer 109 of FIG. 9 includes enlarger/ reducer units (3 I Oa, 31 Ob, ...
3 l On), and a screen overlay unit 302. In FIG. 9, the respective decoded video signals (156a, 156b, ...
156n) received from the video decoder 106 are input to the enlarger/ reducer units (310a, 310b, ... 310n) for each part. The respective decoded video signals (156a, 156b, ... 156n) are enlarged or reduced to desired sizes according to positions of screen sizes in the monitor 332. Then, the enlarged or reduced signals are synthesized in the screen overlay unit 302 and outputted to the monitor 332 as a synthesized signal 352.
As a result, a HDTV picture combined by the respective parts is displayed on one monitor 332.
The audio decoder 107 in FIG. 6 decodes audio streams 170 including a plurality of audio signals and sends them to the audio selector 110. The audio selector selects a desired audio signal (in this case of HDTV, only 157a is selected) according to an audio selection signal 117 and outputs the selected audio signal as an audio output signal 159. The data decoder 108 similarly decodes the data stream 180 and sends the decoded signal to a data selector 116. The data selector 116 selects a desired data signal (in this case of HDTV, only 160a is selected) according to a data selection signal 118 and outputs the selected data signal as a data output signal 161.
I mbodiment 4.
A digital video receiving apparatus of a fourth embodiment of the present invention is explained using FIGS. 10 and 11. FIG. 10 shows a schematic diagram of I 5 the digital video receiving apparatus of the fourth embodiment of the present invention.
The digital video receiving apparatus of FIG. IO includes a tuner 101, an NTSC/PAL
decoder 102, a demodulator 104, a demultiplexer 105, a video decoder 106, an audio decoder 107, a data decoder 108, a display synthesizer 109, an audio selector 110, a data selector 116, a selection signal 148, a digital base band signal 149, a multiplexed signal 185, an analog base band signal 151, an analog video signal 152, a video stream 153, a clock signal 154, a stream identification signal 155, decoded video signals (156a, 156b, ... 156n), decoded audio signals (157a, 157b, ... 157n), an audio selection signal 117, data selection signal 118, a video output signal 158, an audio output signal 159, decoded data signals (160a, 160b, ... 160n), and a data output signal 161.
,, CA 02245339 1998-08-19 The operation of the digital video receiving apparatus shown in FIG. 10 of a fourth embodiment of the present invention is explained. Signals received via a satellite communication or a ground wave communication are branched to an analog base band signal 151 and a digital base band signal 149 by the tuner 101. The analog base band signal 151 is converted to an analog video signal 152 by the NTSC/PAL decoder 102.
The digital base band video signal 149 is demodulated by the demodulator 104 and the demodulated multiplexed signal 185 is sent to the demultiplexer 105. The demodulated multiplexed signal 185 is a multiplexed bit stream including a plurality of SDTV
programs or a bit stream including one HDTV program. FIG. 12 shows a bi.t stream comprising a plurality of SDTV programs. Accompanying data such as clock are included in the header of each packet.
The demultiplexer 105 receives the input multiplexed signal 185 and demultiplexes it to a video signal, an audio signal and a data signal. The respective signals are divided into a stream signal, a clock signal and a stream identification signal in the case of SDTV. For example, as for the video signal, the demultiplexer 105 outputs the video stream 153, the clock signal 154, and the stream identification signal 155 to the video decoder 106. The clock signal 154 corresponds to a plurality of programs, and the stream identification signal 155 is a control signal for selecting a desired program. As for the audio signal, the demultiplexer 105 outputs the audio signal and outputs the audio stream 170, the clock signal 171, and the stream identification signal 172 to the audio decoder 107. The clock signal 171 corresponds to a plurality of programs, and the stream identification signal 172 is a control signal for selecting a desired program.
As for the data signal, the same process is carried out. In the case of SDTV, the demultiplexer 105 extracts only necessary programs and outputs the video stream 153 based on the selection signal 148 inputted from the outside.
In the case of HDTV, the demultiplexer 1 OS outputs a partial signal stream I
53, a clock signal 154 and a stream identification signal I55. The clock signal 154 corresponds to a plurality of programs, and the stream identification signal I
55 is a control signal for selecting a desired partial signal from the multiplexed signal 185.
5 In the case of SDTV, the video decoder 106 outputs the decoded video signals (156a, 156b, ... 156n) corresponding to each program. In the case of HDTV, the video decoder 106 outputs the decoded video signals (156a, 156b, ... 156n) corresponding to each part. Since the decoding method in the video decoder 1 O6 is same as that of the third embodiment, the explanation thereof is omitted.
10 The display synthesizer 109 in the fourth embodiment synthesizes a plurality of decoded HDTV partial video signals (156a, 156b, ... 156n) outputted from the video decoder 106. When the analog video 152 is outputted from the NTSC/PAL decoder 102, the display synthesizer 109 synthesizes the analog SDTV and the digital HDTV and outputs the video signal 158 to display it on a monitor.
15 An example of synthesizing the analog SDTV picture and the digital HDTV
picture is depicted in FIG. 1 I. In FIG. 1 I, the screen regenerator 301 synthesizes the decoded HDTV partial video signals (156a, 156b, ... 156n) outputted from the video decoder 106 and regenerates a HDTV video signal 350. When one of the HDTV
picture and the SDTV picture is displayed in the picture-in-picture system on one 20 monitor, a screen overlay unit 302 overlays the HDTV signal and SDTV signal and outputs a video signal 158 to a monitor 332. The monitor 332 can display the analog picture and the digital picture in one monitor as shown in FIG. I 1 in the picture-in-picture system. When the multiplexed signal 185 is a SDTV signal, as stated in the third embodiment, the screen regenerator 301 synthesizes a plurality of the SDTV
video signals. Then, the screen overlay unit 302 may overlay a plurality of the SDTV
pictures and an analog picture on one monitor.
Advantageously, embodiments of the present invention allow different programs to be seen independently on a plurality of monitors using one digital video receiving apparatus.
Embodiments of the present invention may allow one HDTV program as well as a plurality of SDTV programs to be viewed at the same time on a monitor using one digital video receiving apparatus.
Embodiments of the present invention allow the viewing of digital TV programs sent by digital signal as well as analog TV programs sent by analog signal at the same time on a monitor using one digital video receiving apparatus.
Embodiments of the invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
156n) received from the video decoder 106 are input to the enlarger/ reducer units (310a, 310b, ... 310n) for each part. The respective decoded video signals (156a, 156b, ... 156n) are enlarged or reduced to desired sizes according to positions of screen sizes in the monitor 332. Then, the enlarged or reduced signals are synthesized in the screen overlay unit 302 and outputted to the monitor 332 as a synthesized signal 352.
As a result, a HDTV picture combined by the respective parts is displayed on one monitor 332.
The audio decoder 107 in FIG. 6 decodes audio streams 170 including a plurality of audio signals and sends them to the audio selector 110. The audio selector selects a desired audio signal (in this case of HDTV, only 157a is selected) according to an audio selection signal 117 and outputs the selected audio signal as an audio output signal 159. The data decoder 108 similarly decodes the data stream 180 and sends the decoded signal to a data selector 116. The data selector 116 selects a desired data signal (in this case of HDTV, only 160a is selected) according to a data selection signal 118 and outputs the selected data signal as a data output signal 161.
I mbodiment 4.
A digital video receiving apparatus of a fourth embodiment of the present invention is explained using FIGS. 10 and 11. FIG. 10 shows a schematic diagram of I 5 the digital video receiving apparatus of the fourth embodiment of the present invention.
The digital video receiving apparatus of FIG. IO includes a tuner 101, an NTSC/PAL
decoder 102, a demodulator 104, a demultiplexer 105, a video decoder 106, an audio decoder 107, a data decoder 108, a display synthesizer 109, an audio selector 110, a data selector 116, a selection signal 148, a digital base band signal 149, a multiplexed signal 185, an analog base band signal 151, an analog video signal 152, a video stream 153, a clock signal 154, a stream identification signal 155, decoded video signals (156a, 156b, ... 156n), decoded audio signals (157a, 157b, ... 157n), an audio selection signal 117, data selection signal 118, a video output signal 158, an audio output signal 159, decoded data signals (160a, 160b, ... 160n), and a data output signal 161.
,, CA 02245339 1998-08-19 The operation of the digital video receiving apparatus shown in FIG. 10 of a fourth embodiment of the present invention is explained. Signals received via a satellite communication or a ground wave communication are branched to an analog base band signal 151 and a digital base band signal 149 by the tuner 101. The analog base band signal 151 is converted to an analog video signal 152 by the NTSC/PAL decoder 102.
The digital base band video signal 149 is demodulated by the demodulator 104 and the demodulated multiplexed signal 185 is sent to the demultiplexer 105. The demodulated multiplexed signal 185 is a multiplexed bit stream including a plurality of SDTV
programs or a bit stream including one HDTV program. FIG. 12 shows a bi.t stream comprising a plurality of SDTV programs. Accompanying data such as clock are included in the header of each packet.
The demultiplexer 105 receives the input multiplexed signal 185 and demultiplexes it to a video signal, an audio signal and a data signal. The respective signals are divided into a stream signal, a clock signal and a stream identification signal in the case of SDTV. For example, as for the video signal, the demultiplexer 105 outputs the video stream 153, the clock signal 154, and the stream identification signal 155 to the video decoder 106. The clock signal 154 corresponds to a plurality of programs, and the stream identification signal 155 is a control signal for selecting a desired program. As for the audio signal, the demultiplexer 105 outputs the audio signal and outputs the audio stream 170, the clock signal 171, and the stream identification signal 172 to the audio decoder 107. The clock signal 171 corresponds to a plurality of programs, and the stream identification signal 172 is a control signal for selecting a desired program.
As for the data signal, the same process is carried out. In the case of SDTV, the demultiplexer 105 extracts only necessary programs and outputs the video stream 153 based on the selection signal 148 inputted from the outside.
In the case of HDTV, the demultiplexer 1 OS outputs a partial signal stream I
53, a clock signal 154 and a stream identification signal I55. The clock signal 154 corresponds to a plurality of programs, and the stream identification signal I
55 is a control signal for selecting a desired partial signal from the multiplexed signal 185.
5 In the case of SDTV, the video decoder 106 outputs the decoded video signals (156a, 156b, ... 156n) corresponding to each program. In the case of HDTV, the video decoder 106 outputs the decoded video signals (156a, 156b, ... 156n) corresponding to each part. Since the decoding method in the video decoder 1 O6 is same as that of the third embodiment, the explanation thereof is omitted.
10 The display synthesizer 109 in the fourth embodiment synthesizes a plurality of decoded HDTV partial video signals (156a, 156b, ... 156n) outputted from the video decoder 106. When the analog video 152 is outputted from the NTSC/PAL decoder 102, the display synthesizer 109 synthesizes the analog SDTV and the digital HDTV and outputs the video signal 158 to display it on a monitor.
15 An example of synthesizing the analog SDTV picture and the digital HDTV
picture is depicted in FIG. 1 I. In FIG. 1 I, the screen regenerator 301 synthesizes the decoded HDTV partial video signals (156a, 156b, ... 156n) outputted from the video decoder 106 and regenerates a HDTV video signal 350. When one of the HDTV
picture and the SDTV picture is displayed in the picture-in-picture system on one 20 monitor, a screen overlay unit 302 overlays the HDTV signal and SDTV signal and outputs a video signal 158 to a monitor 332. The monitor 332 can display the analog picture and the digital picture in one monitor as shown in FIG. I 1 in the picture-in-picture system. When the multiplexed signal 185 is a SDTV signal, as stated in the third embodiment, the screen regenerator 301 synthesizes a plurality of the SDTV
video signals. Then, the screen overlay unit 302 may overlay a plurality of the SDTV
pictures and an analog picture on one monitor.
Advantageously, embodiments of the present invention allow different programs to be seen independently on a plurality of monitors using one digital video receiving apparatus.
Embodiments of the present invention may allow one HDTV program as well as a plurality of SDTV programs to be viewed at the same time on a monitor using one digital video receiving apparatus.
Embodiments of the present invention allow the viewing of digital TV programs sent by digital signal as well as analog TV programs sent by analog signal at the same time on a monitor using one digital video receiving apparatus.
Embodiments of the invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
Claims (9)
1. A digital video receiving apparatus for receiving digital broadcasting programs including a plurality of multiplexed media including a video, audio and data, and for providing the programs to subscribers, the apparatus comprising:
a tuner for receiving a multiplexed signal and converting the multiplexed signal to a digital base band signal;
a demodulator for decoding the digital base band signal provided from said tuner;
a demultiplexer for selecting one or more programs from the digital broadcasting programs including a plurality of multiplexed media including a video signal, an audio signal and a data signal according to a program selection signal, and for demultiplexing respective bit streams including a video signal, an audio signal or a data signal;
a video decoder for decoding a video signal demultiplexed by said demultiplexer;
an audio decoder for decoding an audio signal demultiplexed by said demultiplexer; and a data decoder for decoding a data signal demultiplexed by said demultiplexer.
a tuner for receiving a multiplexed signal and converting the multiplexed signal to a digital base band signal;
a demodulator for decoding the digital base band signal provided from said tuner;
a demultiplexer for selecting one or more programs from the digital broadcasting programs including a plurality of multiplexed media including a video signal, an audio signal and a data signal according to a program selection signal, and for demultiplexing respective bit streams including a video signal, an audio signal or a data signal;
a video decoder for decoding a video signal demultiplexed by said demultiplexer;
an audio decoder for decoding an audio signal demultiplexed by said demultiplexer; and a data decoder for decoding a data signal demultiplexed by said demultiplexer.
2. The digital video receiving apparatus of claim 1, wherein said video decoder includes a bit stream divider and a plurality of video decoding units, each of said video decoding units including a partial video decoder and a memory, said bit stream divider generates video streams including a video signal, an audio signal and a data signal for each channel, using a clock and a stream identification signal, and said each video decoding unit decodes the respective video stream for each channel using said partial video decoder and said memory, and outputs the decoded signal as a video output signal.
3.~The digital video receiving apparatus of claim 1, further comprising:
a channel demultiplexer for generating a video stream, a clock signal and a stream identification signal for each channel, using a bit stream including a video signal, an audio signal and a data signal, a clock signal and a stream identification signal each of which is outputted from said demultiplexer, wherein said video decoder, said audio decoder and said data decoder process said respective signals for each channel, and decode and output the video signal, the audio signal and the data signal for each program.
a channel demultiplexer for generating a video stream, a clock signal and a stream identification signal for each channel, using a bit stream including a video signal, an audio signal and a data signal, a clock signal and a stream identification signal each of which is outputted from said demultiplexer, wherein said video decoder, said audio decoder and said data decoder process said respective signals for each channel, and decode and output the video signal, the audio signal and the data signal for each program.
4. ~The digital video receiving apparatus of claim 3, wherein said video decoder includes a plurality of video decoding units, each of said video decoding units including a partial video decoder and a memory, said each video decoding unit decodes the bit stream including a video signal, an audio signal and a data signal outputted from said channel demultiplexer, using a clock signal and a stream identification signal, and outputs a decoded signal as a video output signal.
5.~A digital video receiving apparatus for receiving digital broadcasting programs including a plurality of multiplexed media including a video, audio and data, and for providing the programs to subscribers, the apparatus comprising:
a tuner for receiving a multiplexed signal and converting the multiplexed signal to a digital base band signal;
a demodulator for decoding the digital base band signal provided from said tuner;
a demultiplexer for demultiplexing and outputting a, bit stream including a video signal, an audio signal and a data signal, a clock and a stream identification signal for each channel according to a selection signal, when a multiplexed signal is SDTV, and for demultiplexing and outputting a bit stream including a video signal, an audio signal and a data signal, a clock and a stream identification signal for each partial picture according to a selection signal, when the multiplexed signal is HDTV;
a video decoder for decoding the video signal demultiplexed by said demultiplexer;
an audio decoder for decoding the audio signal demultiplexed by said demultiplexer;
a data decoder for decoding the data signal demultiplexed by said demultiplexer;
a display synthesizer for synthesizing a plurality of the signals outputted from said video decoder and generating a video signal to display on one monitor;
an audio selector for selecting one of the audio signals outputted from said audio decoder; and a data selector for selecting one of the data signals outputted from said data decoder.
a tuner for receiving a multiplexed signal and converting the multiplexed signal to a digital base band signal;
a demodulator for decoding the digital base band signal provided from said tuner;
a demultiplexer for demultiplexing and outputting a, bit stream including a video signal, an audio signal and a data signal, a clock and a stream identification signal for each channel according to a selection signal, when a multiplexed signal is SDTV, and for demultiplexing and outputting a bit stream including a video signal, an audio signal and a data signal, a clock and a stream identification signal for each partial picture according to a selection signal, when the multiplexed signal is HDTV;
a video decoder for decoding the video signal demultiplexed by said demultiplexer;
an audio decoder for decoding the audio signal demultiplexed by said demultiplexer;
a data decoder for decoding the data signal demultiplexed by said demultiplexer;
a display synthesizer for synthesizing a plurality of the signals outputted from said video decoder and generating a video signal to display on one monitor;
an audio selector for selecting one of the audio signals outputted from said audio decoder; and a data selector for selecting one of the data signals outputted from said data decoder.
6. The digital video receiving apparatus of claim 5, wherein said video decoder includes a bit stream divider and a plurality of video decoding units, each of said video decoding units including a partial video decoder and a memory, when the multiplexed signal is SDTV, said bit stream divider generates video streams for each channel from the video signal outputted from the demultiplexer, according to a switching signal, each of said video decoding units decodes said video stream for each channel to output a video signal, and when the multiplexed signal is HDTV, said bit stream divider further generates video streams for each partial picture from the video signal outputted from the demultiplexer, according to the switching signal, and each of said video decoding units decodes said video stream for each partial picture to output a video signal.
7. The digital video receiving apparatus of claim 5, wherein said display synthesizer includes a plurality of enlarger/ reducer units and a screen overlay unit, said display synthesizer enlarges or reduces sizes of the decoded signals inputted from the video decoder, superposes a plurality of the enlarged or reduced video signals and generates a video signal to display on one monitor when a multiplexed signal is SDTV.
8. The digital video receiving apparatus of claim 5, further comprising:
an NTSC/ PAL decoder;
wherein said tuner separates a received multiplexed signal into an analog base band signal and a digital base band signal,~
said NTSC/ PAL decoder decodes the analog base band signal provided from said tuner to generate a decoding video signal, said display synthesizer synthesizes the analog video signal from said NTSC/
PAL decoder and the digital video signal from said video decoder and generates a video signal to display the analog video signal and the digital video signal on one monitor.
an NTSC/ PAL decoder;
wherein said tuner separates a received multiplexed signal into an analog base band signal and a digital base band signal,~
said NTSC/ PAL decoder decodes the analog base band signal provided from said tuner to generate a decoding video signal, said display synthesizer synthesizes the analog video signal from said NTSC/
PAL decoder and the digital video signal from said video decoder and generates a video signal to display the analog video signal and the digital video signal on one monitor.
9. The digital video receiving apparatus of claim 8, wherein said display synthesizer includes a screen regenerator and a screen overlay unit, when no analog TV signal is inputted from said NTSC/ PAL decoder, said display synthesizer synthesizes the digital HDTV video signal received from said video decoder to generate a video signal to display on one monitor, and when the analog TV signal is inputted from said NTSC/ PAL decoder, said screen overlay unit superposes the HDTV video signal and the analog TV signal and generates a video signal to display on one monitor.
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| JP10-075303 | 1998-03-24 |
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| CA2245339C true CA2245339C (en) | 2005-02-15 |
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Families Citing this family (61)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4066212B2 (en) * | 1998-06-10 | 2008-03-26 | 船井電機株式会社 | Digital broadcast receiver and control method thereof |
| US6731347B1 (en) * | 1999-04-09 | 2004-05-04 | Sony Corporation | Method for switching signal input based on device capability |
| AU4208600A (en) * | 1999-04-09 | 2000-11-14 | Sony Electronics Inc. | Method for switching signal input based on device capability |
| EP1226712B1 (en) * | 1999-11-04 | 2003-04-23 | Thomson Licensing S.A. | Television receiver in a television program distribution system |
| JP2001358668A (en) * | 2000-06-16 | 2001-12-26 | Pioneer Electronic Corp | Receiving apparatus for digital broadcast |
| JP2002044559A (en) * | 2000-07-31 | 2002-02-08 | Sony Corp | Image processing method and image processing unit |
| CN1555620A (en) * | 2000-09-11 | 2004-12-15 | 松下电器产业株式会社 | Stream decoder |
| JP2002094401A (en) * | 2000-09-14 | 2002-03-29 | Sony Corp | Processing device for broadcast signal reception |
| JP2002112268A (en) * | 2000-09-29 | 2002-04-12 | Toshiba Corp | Compressed image data decoding apparatus |
| GB0026208D0 (en) * | 2000-10-26 | 2000-12-13 | Koninkl Philips Electronics Nv | A decoder supporting multiple inputs |
| US6630964B2 (en) * | 2000-12-28 | 2003-10-07 | Koninklijke Philips Electronics N.V. | Multi-standard channel decoder for real-time digital broadcast reception |
| US6828987B2 (en) * | 2001-08-07 | 2004-12-07 | Ati Technologies, Inc. | Method and apparatus for processing video and graphics data |
| US7253818B2 (en) * | 2001-08-07 | 2007-08-07 | Ati Technologies, Inc. | System for testing multiple devices on a single system and method thereof |
| US7016418B2 (en) * | 2001-08-07 | 2006-03-21 | Ati Technologies, Inc. | Tiled memory configuration for mapping video data and method thereof |
| US7042950B2 (en) * | 2001-11-14 | 2006-05-09 | Matsushita Electric Industrial Co., Ltd. | Multichannel video processing unit and method |
| US7120168B2 (en) * | 2001-11-20 | 2006-10-10 | Sony Corporation | System and method for effectively performing an audio/video synchronization procedure |
| AU2003218251A1 (en) * | 2002-03-21 | 2003-10-08 | Thomson Licensing S.A. | Signal receiver for reveiveg simultaneously a plurality of broadcast signals |
| US20030189666A1 (en) * | 2002-04-08 | 2003-10-09 | Steven Dabell | Multi-channel digital video broadcast to composite analog video converter |
| JP2003319374A (en) * | 2002-04-24 | 2003-11-07 | Sony Corp | Remote supervisory apparatus and remote supervisory system |
| US7092256B1 (en) * | 2002-04-26 | 2006-08-15 | Sandisk Corporation | Retractable card adapter |
| US7921443B2 (en) | 2003-01-31 | 2011-04-05 | Qwest Communications International, Inc. | Systems and methods for providing video and data services to a customer premises |
| US8490129B2 (en) | 2003-01-31 | 2013-07-16 | Qwest Communications International Inc. | Methods, systems and apparatus for selectively distributing urgent public information |
| US10142023B2 (en) | 2003-01-31 | 2018-11-27 | Centurylink Intellectual Property Llc | Antenna system and methods for wireless optical network termination |
| US7194249B2 (en) | 2003-01-31 | 2007-03-20 | Qwest Communications International Inc. | Methods, systems and apparatus for providing urgent public information |
| US20040150749A1 (en) * | 2003-01-31 | 2004-08-05 | Qwest Communications International Inc. | Systems and methods for displaying data over video |
| US8713617B2 (en) | 2003-01-31 | 2014-04-29 | Qwest Communications International Inc. | Systems and methods for providing television signals using a network interface device |
| US20040163126A1 (en) * | 2003-01-31 | 2004-08-19 | Qwest Communications International Inc. | Methods and apparatus for delivering a computer data stream to a video appliance with a network interface device |
| US20040150748A1 (en) * | 2003-01-31 | 2004-08-05 | Qwest Communications International Inc. | Systems and methods for providing and displaying picture-in-picture signals |
| US8112449B2 (en) | 2003-08-01 | 2012-02-07 | Qwest Communications International Inc. | Systems and methods for implementing a content object access point |
| US20050157215A1 (en) * | 2003-09-11 | 2005-07-21 | Echostar Techonologies Corporation | Method and apparatus for detecting an inactive channel selecting resource in a television converter |
| KR100585741B1 (en) | 2003-10-20 | 2006-06-07 | 엘지전자 주식회사 | Multimedia mobile terminal |
| US20050138670A1 (en) * | 2003-12-20 | 2005-06-23 | Alcatel | Digital video overlay for passive optical networks |
| KR100896684B1 (en) * | 2004-01-27 | 2009-05-14 | 삼성전자주식회사 | Digital broadcasting transmission/reception capable of improving receiving performance and signal processing method thereof |
| JP4475396B2 (en) * | 2004-03-25 | 2010-06-09 | 日本電気株式会社 | Data broadcasting system and format conversion method |
| US7152801B2 (en) * | 2004-04-16 | 2006-12-26 | Sandisk Corporation | Memory cards having two standard sets of contacts |
| US7487265B2 (en) * | 2004-04-16 | 2009-02-03 | Sandisk Corporation | Memory card with two standard sets of contacts and a hinged contact covering mechanism |
| US7720113B2 (en) * | 2004-04-23 | 2010-05-18 | Panasonic Corporation | Receiving apparatus, receiving system using same, and receiving method thereof |
| US8087057B2 (en) | 2004-04-28 | 2011-12-27 | Echostar Technologies L.L.C. | Television converter device including an internet protocol interface |
| US8112784B1 (en) | 2004-04-28 | 2012-02-07 | Echostar Corporation | Device comprising multiple channel selectors |
| US20060061682A1 (en) * | 2004-09-22 | 2006-03-23 | Bradley Bruce R | User selectable content stream |
| JP2006109290A (en) * | 2004-10-08 | 2006-04-20 | Matsushita Electric Ind Co Ltd | Decoding apparatus |
| US7986846B2 (en) * | 2004-10-26 | 2011-07-26 | Samsung Electronics Co., Ltd | Apparatus and method for processing an image signal in a digital broadcast receiver |
| TWI248762B (en) * | 2004-11-10 | 2006-02-01 | Realtek Semiconductor Corp | Video processing device and method thereof |
| US20090251616A1 (en) * | 2005-04-28 | 2009-10-08 | Samsung Electronics Co., Ltd. | Apparatus and method for processing data in digital broadcasting receiver |
| WO2006115388A1 (en) * | 2005-04-28 | 2006-11-02 | Samsung Electronics Co., Ltd. | Apparatus and method for processing data in digital broadcasting receiver |
| KR20060115465A (en) * | 2005-05-06 | 2006-11-09 | 주식회사 팬택앤큐리텔 | Apparatus for receiving a digital multimedia broadcasting |
| US7710736B2 (en) | 2005-08-02 | 2010-05-04 | Sandisk Corporation | Memory card with latching mechanism for hinged cover |
| US9948882B2 (en) | 2005-08-11 | 2018-04-17 | DISH Technologies L.L.C. | Method and system for toasted video distribution |
| JP4534975B2 (en) * | 2005-12-08 | 2010-09-01 | 株式会社日立製作所 | REPRODUCTION DEVICE, REPRODUCTION METHOD, RECORDING METHOD, VIDEO DISPLAY DEVICE, AND RECORDING MEDIUM |
| JP4534974B2 (en) * | 2005-12-08 | 2010-09-01 | 株式会社日立製作所 | REPRODUCTION DEVICE, REPRODUCTION METHOD, RECORDING METHOD, VIDEO DISPLAY DEVICE, AND RECORDING MEDIUM |
| JP2007334071A (en) * | 2006-06-16 | 2007-12-27 | Sony Corp | Video signal processor and display device |
| KR101086423B1 (en) * | 2007-01-12 | 2011-11-25 | 삼성전자주식회사 | Method of improving channel switching speed in a digital TV receiver and digital TV receiver thereof |
| US20100182339A1 (en) * | 2007-09-26 | 2010-07-22 | Nobutaka Kitajima | Data processing apparatus and method |
| CN101425863B (en) * | 2007-10-30 | 2011-03-23 | 中兴通讯股份有限公司 | Mobile terminal for supporting rich media service |
| JP5018515B2 (en) | 2007-11-20 | 2012-09-05 | ソニー株式会社 | Information processing apparatus, information processing method, display control apparatus, display control method, and program |
| US20090150940A1 (en) * | 2007-12-05 | 2009-06-11 | Echostar Technologies Corporation | Downloading of an interactive application to a broadcast programming receiver |
| WO2011132398A1 (en) * | 2010-04-20 | 2011-10-27 | パナソニック株式会社 | Input/output switching device and input/output switching method |
| WO2015005833A1 (en) * | 2013-07-08 | 2015-01-15 | Telefonaktiebolaget L M Ericsson (Publ) | Control of a distributed data grid layer in a federated database system |
| CN106131666A (en) * | 2016-07-18 | 2016-11-16 | 杭州当虹科技有限公司 | A kind of set-top box video navigation system based on many tracks Video Composition technology |
| CN108462849A (en) * | 2018-06-29 | 2018-08-28 | 深圳市索飞翔科技有限公司 | HDMI video dispenser |
| CN112770174A (en) * | 2020-12-30 | 2021-05-07 | 稿定（厦门）科技有限公司 | Video file streaming method and device |
Family Cites Families (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0766478B1 (en) | 1991-03-27 | 2002-03-27 | Matsushita Electric Industrial Co., Ltd. | Signal transmission system |
| EP0823818B1 (en) | 1991-08-13 | 2002-01-09 | Canon Kabushiki Kaisha | Image transmission apparatus |
| US5892879A (en) * | 1992-03-26 | 1999-04-06 | Matsushita Electric Industrial Co., Ltd. | Communication system for plural data streams |
| US5289276A (en) * | 1992-06-19 | 1994-02-22 | General Electric Company | Method and apparatus for conveying compressed video data over a noisy communication channel |
| JPH0622215A (en) | 1992-07-06 | 1994-01-28 | Toshiba Corp | Video transmission method, video transmitter and video receiver used for the same |
| US5493339A (en) * | 1993-01-21 | 1996-02-20 | Scientific-Atlanta, Inc. | System and method for transmitting a plurality of digital services including compressed imaging services and associated ancillary data services |
| US5583562A (en) * | 1993-12-03 | 1996-12-10 | Scientific-Atlanta, Inc. | System and method for transmitting a plurality of digital services including imaging services |
| KR100332743B1 (en) * | 1994-11-26 | 2002-11-07 | 엘지전자주식회사 | Device and method for preventing illegal copy or unauthorized watching of digital image |
| KR970007893B1 (en) * | 1994-12-31 | 1997-05-17 | 삼정전자 주식회사 | Automatic setting device for channel |
| JP4001942B2 (en) | 1995-02-06 | 2007-10-31 | ソニー株式会社 | Receiving apparatus and receiving method, and broadcasting system and broadcasting method |
| US5909257A (en) * | 1996-02-27 | 1999-06-01 | Victor Company Of Japan, Ltd. | Apparatus and method of receiving broadcasted digital signal |
| JP4642161B2 (en) * | 1996-04-12 | 2011-03-02 | ソニー株式会社 | Data decoding apparatus and data decoding method |
| CN1051193C (en) | 1997-01-30 | 2000-04-05 | 广播电影电视部广播科学研究院电视研究所 | System for transmission of high distinctness TV by use of existing digital broadcast equipment |
| US5844636A (en) * | 1997-05-13 | 1998-12-01 | Hughes Electronics Corporation | Method and apparatus for receiving and recording digital packet data |
| US6233253B1 (en) * | 1997-05-23 | 2001-05-15 | Thomson Licensing S.A. | System for digital data format conversion and bit stream generation |
| US6101195A (en) * | 1997-05-28 | 2000-08-08 | Sarnoff Corporation | Timing correction method and apparatus |
| US5907582A (en) * | 1997-08-11 | 1999-05-25 | Orbital Sciences Corporation | System for turbo-coded satellite digital audio broadcasting |
| US6118498A (en) * | 1997-09-26 | 2000-09-12 | Sarnoff Corporation | Channel scanning and channel change latency reduction in an ATSC television receiver |
| KR100294663B1 (en) * | 1997-12-29 | 2001-09-17 | 구자홍 | Mpeg decoder and decoding control method |
| JPH11239305A (en) * | 1998-02-24 | 1999-08-31 | Sony Corp | Digital television broadcast receiver |
| US6160570A (en) * | 1998-04-20 | 2000-12-12 | U.S. Philips Corporation | Digital television system which selects images for display in a video sequence |
| US6115080A (en) * | 1998-06-05 | 2000-09-05 | Sarnoff Corporation | Channel selection methodology in an ATSC/NTSC television receiver |
-
1998
- 1998-03-24 JP JP07530398A patent/JP3937564B2/en not_active Expired - Fee Related
- 1998-07-30 TW TW087112543A patent/TW376643B/en active
- 1998-08-12 US US09/132,676 patent/US6330036B1/en not_active Expired - Lifetime
- 1998-08-19 CA CA 2245339 patent/CA2245339C/en not_active Expired - Fee Related
- 1998-08-19 FR FR9810558A patent/FR2776880B1/en not_active Expired - Fee Related
- 1998-08-20 CN CN98118608A patent/CN1115872C/en not_active Expired - Fee Related
-
2001
- 2001-10-05 US US09/970,951 patent/US6590615B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2245339A1 (en) | 1999-09-24 |
| FR2776880A1 (en) | 1999-10-01 |
| TW376643B (en) | 1999-12-11 |
| US6330036B1 (en) | 2001-12-11 |
| US20020012069A1 (en) | 2002-01-31 |
| JP3937564B2 (en) | 2007-06-27 |
| US6590615B2 (en) | 2003-07-08 |
| JPH11275480A (en) | 1999-10-08 |
| CN1230076A (en) | 1999-09-29 |
| FR2776880B1 (en) | 2000-12-01 |
| CN1115872C (en) | 2003-07-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
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| MKLA | Lapsed |
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