CA1278604C - Line switching control system for mobile communication - Google Patents
Line switching control system for mobile communicationInfo
- Publication number
- CA1278604C CA1278604C CA000549306A CA549306A CA1278604C CA 1278604 C CA1278604 C CA 1278604C CA 000549306 A CA000549306 A CA 000549306A CA 549306 A CA549306 A CA 549306A CA 1278604 C CA1278604 C CA 1278604C
- Authority
- CA
- Canada
- Prior art keywords
- switching
- modem
- transmitter
- data
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
Abstract
ABSTRACT OF THE DISCLOSURE
A line switching control system effects switching between a data communication mode and a voice communication mode in mobile communication, particularly mobile telephone service. The line switching control system includes a transmitter/receiver unit for transmitting and receiving signals through an antenna, an input device combined with a telephone, a switching device for effecting switching between the data communication mode and the voice communication mode, and a control unit for controlling switching between the data communication mode and the voice communication mode based on a mode switching command entered through the input device. When a key of the input device at the user's hand is depressed, switching between the data communication mode and the voice communication mode can smoothly be performed.
A line switching control system effects switching between a data communication mode and a voice communication mode in mobile communication, particularly mobile telephone service. The line switching control system includes a transmitter/receiver unit for transmitting and receiving signals through an antenna, an input device combined with a telephone, a switching device for effecting switching between the data communication mode and the voice communication mode, and a control unit for controlling switching between the data communication mode and the voice communication mode based on a mode switching command entered through the input device. When a key of the input device at the user's hand is depressed, switching between the data communication mode and the voice communication mode can smoothly be performed.
Description
1~78~j~4 27sg8-36 TITLE OF THE INVENTION
__ _ LINE SWITCHING CONTROL SYSTEM
FOR ~IOBILE: COHMIJNICATION
BACXGR0UNU OF THE IN~E~TIO~
1. Field of the Invention The present invention relates to a line switching control system for effecting line switching between a facsimile communication mode or a data communication mode and a voice communication mode in mobile communication, particularly mobile telephone service where a facsimile or a data terminal is added to an automobile telephone unit.
__ _ LINE SWITCHING CONTROL SYSTEM
FOR ~IOBILE: COHMIJNICATION
BACXGR0UNU OF THE IN~E~TIO~
1. Field of the Invention The present invention relates to a line switching control system for effecting line switching between a facsimile communication mode or a data communication mode and a voice communication mode in mobile communication, particularly mobile telephone service where a facsimile or a data terminal is added to an automobile telephone unit.
2. Description of the Prior Ar~:
As social and economic activities are more and more complicated and diversified, there are demands for increa~ed capacity and improved quality of electronic communication services.
Mobile communication plays an important role as it allows users to communicate anytime and anywhere.
Particularly, the mobile communication system has already entered the commercial stage in various countries such as the U.S.A., Japan, and European countries. Moreover, data communication and facsimile communication have also started to be available in the mobile communication, especially, the mohile telephone network.
Since the marke~ for such new communication service has not yet been full-fledged, it is the current practice to carry out data communication through the mobile ,, 1 ,, ,;
1;~78~i()fL
telephone network by either e~ecting switching between a data mode or a voice mode wi~h a manual ~witch as~ociated with a modem or performing ~ode switching with the switch of a switch box coupled between a mobile telephone set and a modem. The latter switching arrangement is employed ~or ~acsimile communication.
For data or facsimile communication using a general telephone ne~work, it is customary to attach an NCU(Network Control Unit) to a modem or assemble the NCU
in the modem, and to effect channel switching between data and facsimile modes with a manual switch having an NCU
function.
However, where data or facsimile communication is to be carried out using the mobile telephone network, since no device with the above control function is available now, switching has to be controlled only by the manual switch of a modem or a switching box between the modem or facsimile and the mobile telephone set.
At present, priority i9 given to the installation of a ~mobile telephone unit in an automobile, and a modem or switching box, as referred to above, is often located in a place remote from the user (such as at the assistant driver's seat or the dashboard in front of the assistant driver's seat). Consequently, the user or driver must reach for the switch or move to the modem or switching box for the access to the switch.
When there is an incoming call while the automobile ~78~
is running, the call cannot be answered by the driver since accessing the switch at such a time is extremely dangerous.
S UMMARY OF THE I NVENT I ON
Therefore, it i5 an ohject of the present invention to provide a line switching control system for mobile communication, which is capable of easily effecting switching between a data communication mode and a voice communication (telephonic communication) mode at the user's hand.
o 6J'~c t/ ~
~ o accomplish the above object, a line ~witching control system according to the pre~ent invention includes transmitter/receiver means for transmitting and receiving signalfi through an antenna, input means comprising dial keys and function keys combined with a handset, switching means for effecting switching between a data communication mode and a voice communication mode, and control means for switching between the data communication mode and the voice communication mode based on a mode switching command entered through the input means. When a key of the input means at the user's hand is depressed, a switching command i9 generated and applied to the control means which recognizes the switching command and controls the switching means to switch from the voice communication mode to the data communication mode or from the data communication mode to the voice communication mode. As a consequence, a signal line from the transmitter/receiver 1~7~j()4 275g8-36 means is selectively connected to a modem or a facsimile or the handse~ through the switching means, so that switching between the data communication mode and the voice communication mode can smoothly be effected.
In accordance with a broad aspect of the invention there is provided a line switching control system comprising:
~ a) a transmitter/receiver means for transmitting and receiving signals through an antenna;
(b) an input means combined with a handset;
(c) a switching means for effecting switching between a first mode in which a signal line from said transmitter/receiver means is connected to a modem and a second mode in which said signal line is connected to said handset; and (d) a control means for detecting line switching information whicn is inputted by said input means and for controlling said switching means in response to a switching command comprising coded line switching information which is sent from said handset to said modem via said transmitter/receiver means.
In accordance with another broad aspect of the invention there is provided a line switching control system used in a mobile telephone set including a transmitter/receiver unit, a control unit which comprises a handset and a cradle, and a data modem, comprising:
(a) a key switch means combined with said handset for inputting line switching information;
8()4 2759~-36 (b) a common data bus for electrically connecting said transmitter/receiver unit, said control u~it, and said modem;
(c) signal lines for electrically connectlny said transmitter/receiver unit, said control unit, and said data modem, said signal lines including at least one signal line for transmittiny an audio frequency signal;
(d~ a first control means provided in said control unit for detecting said line switching information and generating a predetermined data pattern in response to said detection of said line switching information;
(e) a second control means provided in said data modem for detecting said predetermined data pattern sent from said first control means via said common data bus, said second control means generating a control signal in response to detection of said predetermined data pattern; and (f) a switching means provided in said data modem for effecting switching, in response to said control signals, between a first mode in which said signal lines from said transmitter/receiver unit are electrically connec~ed to said data 2~ modem and a second mode in which said signal lines are electrically connected to said control unit.
The above and other objectives, features and advantages of the pxesent invention will become more apparent from the following description when taken in conjunction with the accompanying drawings in which a preferred embodiment of the present invention is shown by way of illustrative example.
4a ~8~0~
2759~3-36 B IEE DESCRIPTION O~ TH~ D_AWINGS
Figs. lA, lB, and lC, when arranged together, are a bloGk diayraTn of a mobile telephone unit, a handset and a data terminal according to a irst embodiment of the present invention;
Fig. 2 is a flo~lchart of operation for switching from a voice communication mode to a data communication mode;
Fig. 3 is a circuit diagram of a switch; and Figs. 4A 4B, and 4C, when arranged together, show a block diagram of a mobile telephone unit according to a second embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Figs. lA, lB, and lC, when arranged together, show in block form a mobile telephone unit according to a first embodiment of the present invention. The mobile telephone unit has switching means in a data modem for effecting switching between a data communication mode and a voice communication mode.
The mobile telephone unit includes a transmitter/receiver unit (TRU) 1 generally having a 4b 1;~7~ 4 receiver l~, a transmitter 12, a controller 13, a~ I/O
port L4, and a du~lexer 15.
The receiver l.l ha~ a radio-frequency amplifier lla for amplifying a received ~ignal (radio-frequency ~ignal) comin~ in through the duplexer 15, a local o~cillator llb for generating a local frequency, a mixer llc for mixing the radio-frequency signal and the local frequency into an intermediate-frequency signal, an intermediate-frequency amplifier lld (including a limiter and a discriminator) for amplifying, controlling the amplitude of, and demodulating the intermediate-frequency signal, and an audio-frequency amplifier lle for amplifying an audio-frequency signal to a prescribed level.
The transmitter 12 has an audio-frequency amplifier 12a for amplifying an audio-frequency signal, an oscillator 12b for generating a radio-frequency signal serving a~ a ba~i~ for a radio wave to be transmitted, a modulator 12c for phase-modulating the radio-frequency signal from the oscillator 12b with the audio-frequency signal from the auio-frequency amplifier 12a, a preamplifier 12d for amplifying the modulated radio-frequency signal to a predetermined level, and power amplifier 12e for amplifying the radio-frequency ~ignal from the preamplifier 12d to a power level which is high enough to be able to radiate from an antenna. The duplexer 15 allow~ the antenna to be alternately used for transmitting and receiving signals.
78~tJ4 The receiver 11 and the transmitter 12 of the above con~truction are known.
The controller 13 comprises a CPU 13a, an address latch 13b, a RAM l3c, and a ROM 13d. The controller 13 ~erves to control the TRU 1 in its entirety, and issues switching commands (described later). The I/O port 14 transmits and receives control data between the TRU 1 and a control unit (cu) 2 and a data modem 3 through a data bus B.
The control unit 2 has an audio-frequency amplifier 21 for amplifying an audio-frequency ~ignal, a telephone tranmitter/receiver 22 for effecting communication with the calling or called party, an I/O port 23 for transmitting data to and receiving data from the TRU 1 and the data modem 3, a controller 24, and a key switch 25 composed of dial keys and function keys that are manually operated by the user to enter data. The control unit 2 corresponds to a normal mobile telephone handset and a cradle for accomodating the handset.
Control data established by the key switch 25 and the controller 24 of the control unit 2 is sent from the I/O
port 23 over the bus B to the controller 13 of the TRU 1 and a controller 34 (described later) of the data modem 3.
The telephone transmitter/receiver 22 of the control unit 2 is connected to the receiver 11 and the transmitter 12 of the TRU 1 through the audio-frequency amplifier 21, a signal line ~b, a switch 31 (described later) of the data 1;~78~i()4 modem 3, and a signal line Qa.
The data modem 3 comprises a line switching switch 31, a modem circuit 32, an I/O port 33, a controller 34, and an RS-232C interace port 35. The switch 31 is actuated by a signal from the I/O port 33 under the control of the controller 34 for connecting the signal line Q a connected to the receiver 11 and the transmitter 12 of the TRU 1 to either the control unit 2 over the signal line Qb or the modem circuit 32.
When the controller 34 controls the switch 31 to connect the signal line Qa to the modem circuit 32 through the I/O port 33, the modem circuit 32 demodulates data delivered from the TRU 1 through the signal line Qa and the switch 31, and modulates data entered from a data terminal 4 through the port 35 and the controller 34. The controller 34 comprises a CP[~ 34a, an address latch 34b, a RAM 34c, and a ROM 34d, and serves to decode the demodulated data from the modem circuit 32 and encode the data entered from the terminal 4 through the port 35.
Operation of the automobile telephone unit thus constructed will be described below.
First, a voice communication mode will be described.
It is assumed that at an initial stage the switch 31 of the data modem 3 connects the signal lines Qa, Qb to each other. The mobile telephone apparatus is in the voice communication mode.
A voice signal received by the TRU 1 and delivered 7~
275~ 6 froln the out~pu~ of the receiver 11 is sent via the siynal line ~a, the ~wit~h 31, the signal line Qb, and the audlo~frequen-y amplifier 21, and receivecl by the telephone transl-nitter/receiver 22. A voice siynal can be transmitted from the telephone transmitter/receiver 22 through the inverted p~th ko the transmitter 12 of the TRU 1, from which the siynal can be transmitted via the ~ntenna.
Data communication will now be described in detail with reference to Fig. 2.
The power supply of the mobile telephone unit is switched on. A wake-up tone is then confirmed, in step S1, through a loudspeaker (not shown) connected to the audio-frequency amplifier 21. Thereafter, a party to which data should be sent is called in an audio communication mode to thereby connect a channel.
Data or facsimile mode setting information (channel switching control information) is entered through the key switch 25 in s~ep S2. Such setting information is set by using, for example, one or a combination of numerals, letters, symbols, etc.
The setting information thus entered is recognized by the controller 24 of the control unit 2. After the settinq information has been encoded by the controller 24, it is delivered via the I/0 port 23 and the bus B to the TRU 1. The controller 13 of the TRU 1 recognizes the encoded setting information applied through the I/0 port 14 step S3. Then, the controller 13 sends a mode switching command having a predetermined data pattern (e.g., 1~:'7~04 FFFFH~ over the bus B to the data modem 3 in step S4. The controller 34 of the d~ta modem 3, which has been in an idling condition tor a monitor mode), recognizes the switching command delivered through ~he I/0 port 33, and then places the data modem 3 in a data communication mode, and effects the following operation in step S5. First, the controller 34 sends a hook signal to the controller 13 of the TRU 1. That is, the controller 34 sends a signal corresponding to an off-hook signal of the telephone transmitter/receiver for telephone communication, so that the connected channel will be held against being cut off.
The controller 3~ controls the switch 31 to disconnect the signal line ~ a from the signal line ~b and connect the signal line ~a to the modem circuit 32. As a result, the apparatus is switched from the voice communication mode to the data communication mode.
In a data communication modem initiated by outgoing signal transmission, a data signal delivered from the terminal 4 through the port 35 is temporarily stored in the RAM 34c of the controller 34. The stored data signal is read out and modulated by the modem circuit 32. The modulated data signal is sent from the modem circuit 32 through the switch 31 and the signal line ~a to the transmitter 12 of the TRU 1. The transmitter 12 modulates the radio-frequency signal with the modulated data signal, 1~7~jV~
and then ~end~ the signal through the duplexer lS and the antenna to a called station.
In a data communication mode initiated by incoming signal reception, a data signal received fr~m a calling party i~ sent from the receiver 1I via the ~ignal line Qa and the switch 3l to the modem circuit 32 of the data modem 3. The received data signal is demodulated by the modem circuit 32 and then stored in the RAM 34c of the controller 34. The stored demodulated data signal is decoded by the controller 34 and delivered through the port 35 to the terminal 4.
The switch 31 will be described in detail with reference to Fig. 3.
The switch 31 includes various electromagnetic relays as switching devices. However, semiconductor devices with a large ON/OFF ratio may also be used instead of such relays.
A relay SW 31a is controlled by the controller 34 via the I/O port 33 so as to be actuated or released by turning on or off a relay driving transistor Tr 3lc with a control signal from the controller 34. Four switches 31b are contacts of the relay SW 31a. When the relay SW 31a is released, the TRU 1 is connected through the signal lines Qa, Qb to the control unit 2. When the relay SW 31a is actuated, the TRU 1 is connected through the signal line Qa to the modem circuit 32. The arrows 31d in Fig. 3 indicate the directions in which signals are sent.
275~8-36 Figs. 4A, 4B, and 4C, when arranged together, show a mobile telephone unit according to a second embodiment o~ the present invention. This embodiment differs from that of Figs. lA, lB, and lC in that a switching box s is employed in place of the modem 3, the switching box 5 being similar to the modèm 3 except that no modem circuit 32 is included. An ou~put signal from the switch 31 is delivered via the port 35 to a modem or facsimile 6.
The switching box 5 has a simpler controller 51 for only recognizing a switching command and controlling the switch 31.
The controller 51 may be in the form of a one-chip microcomputer.
Operation of the second embodiment is as follows:
When data or facsimile mode setting information (line switching control information) is recognized by the controller 13 of the TRU 1, the controller 13 sends a switching command via the bus B to the switching box 5. In the switching box 5 which has been in an idling condition, the controller 51 receives the switching command and controls the switch 31 to disconnect the signal line Qa from the signal line Qb and connect the signal line ~a via the port 35 to the modem or facsimile 6, thus entering a data communication mode. Where the TRU 1 effects incoming signal reception, a data signal from a calling party is received by the receiver 11 and delivered therefrom via the signal line Qa, the switch 31, and the port 35 to the modem or facsimile 6. In case ~he TRU 1 performs outgoing signal transmission, a data signal is transmitted in the reversed process.
,;
1~78~ 4 275~- J6 As described above, the mobile telephone unit which has a control function to connect itself to a modem or facsimile can very easily effect switchiny between a data or facsimile communication mode and a voice communication mode with the control unit 2 available at the user's hand, no matter where the modem or facsimile transmitter/receiver 6 coupled by the modem 3 or the switching box 5 may be located.
With the present invention, therefore, switching between a first mode in which the transmitter/receiver unit is connected to a modem or facsimile and a second mode in which the transmitter~receiver unit is connected to a control unit can easily be performed by a control means at the user's hand.
Although certain preferred embodiments have been shown and described, it should be understood that many changes and modifications may be made therein without departiny from the scope of the appended claims.
As social and economic activities are more and more complicated and diversified, there are demands for increa~ed capacity and improved quality of electronic communication services.
Mobile communication plays an important role as it allows users to communicate anytime and anywhere.
Particularly, the mobile communication system has already entered the commercial stage in various countries such as the U.S.A., Japan, and European countries. Moreover, data communication and facsimile communication have also started to be available in the mobile communication, especially, the mohile telephone network.
Since the marke~ for such new communication service has not yet been full-fledged, it is the current practice to carry out data communication through the mobile ,, 1 ,, ,;
1;~78~i()fL
telephone network by either e~ecting switching between a data mode or a voice mode wi~h a manual ~witch as~ociated with a modem or performing ~ode switching with the switch of a switch box coupled between a mobile telephone set and a modem. The latter switching arrangement is employed ~or ~acsimile communication.
For data or facsimile communication using a general telephone ne~work, it is customary to attach an NCU(Network Control Unit) to a modem or assemble the NCU
in the modem, and to effect channel switching between data and facsimile modes with a manual switch having an NCU
function.
However, where data or facsimile communication is to be carried out using the mobile telephone network, since no device with the above control function is available now, switching has to be controlled only by the manual switch of a modem or a switching box between the modem or facsimile and the mobile telephone set.
At present, priority i9 given to the installation of a ~mobile telephone unit in an automobile, and a modem or switching box, as referred to above, is often located in a place remote from the user (such as at the assistant driver's seat or the dashboard in front of the assistant driver's seat). Consequently, the user or driver must reach for the switch or move to the modem or switching box for the access to the switch.
When there is an incoming call while the automobile ~78~
is running, the call cannot be answered by the driver since accessing the switch at such a time is extremely dangerous.
S UMMARY OF THE I NVENT I ON
Therefore, it i5 an ohject of the present invention to provide a line switching control system for mobile communication, which is capable of easily effecting switching between a data communication mode and a voice communication (telephonic communication) mode at the user's hand.
o 6J'~c t/ ~
~ o accomplish the above object, a line ~witching control system according to the pre~ent invention includes transmitter/receiver means for transmitting and receiving signalfi through an antenna, input means comprising dial keys and function keys combined with a handset, switching means for effecting switching between a data communication mode and a voice communication mode, and control means for switching between the data communication mode and the voice communication mode based on a mode switching command entered through the input means. When a key of the input means at the user's hand is depressed, a switching command i9 generated and applied to the control means which recognizes the switching command and controls the switching means to switch from the voice communication mode to the data communication mode or from the data communication mode to the voice communication mode. As a consequence, a signal line from the transmitter/receiver 1~7~j()4 275g8-36 means is selectively connected to a modem or a facsimile or the handse~ through the switching means, so that switching between the data communication mode and the voice communication mode can smoothly be effected.
In accordance with a broad aspect of the invention there is provided a line switching control system comprising:
~ a) a transmitter/receiver means for transmitting and receiving signals through an antenna;
(b) an input means combined with a handset;
(c) a switching means for effecting switching between a first mode in which a signal line from said transmitter/receiver means is connected to a modem and a second mode in which said signal line is connected to said handset; and (d) a control means for detecting line switching information whicn is inputted by said input means and for controlling said switching means in response to a switching command comprising coded line switching information which is sent from said handset to said modem via said transmitter/receiver means.
In accordance with another broad aspect of the invention there is provided a line switching control system used in a mobile telephone set including a transmitter/receiver unit, a control unit which comprises a handset and a cradle, and a data modem, comprising:
(a) a key switch means combined with said handset for inputting line switching information;
8()4 2759~-36 (b) a common data bus for electrically connecting said transmitter/receiver unit, said control u~it, and said modem;
(c) signal lines for electrically connectlny said transmitter/receiver unit, said control unit, and said data modem, said signal lines including at least one signal line for transmittiny an audio frequency signal;
(d~ a first control means provided in said control unit for detecting said line switching information and generating a predetermined data pattern in response to said detection of said line switching information;
(e) a second control means provided in said data modem for detecting said predetermined data pattern sent from said first control means via said common data bus, said second control means generating a control signal in response to detection of said predetermined data pattern; and (f) a switching means provided in said data modem for effecting switching, in response to said control signals, between a first mode in which said signal lines from said transmitter/receiver unit are electrically connec~ed to said data 2~ modem and a second mode in which said signal lines are electrically connected to said control unit.
The above and other objectives, features and advantages of the pxesent invention will become more apparent from the following description when taken in conjunction with the accompanying drawings in which a preferred embodiment of the present invention is shown by way of illustrative example.
4a ~8~0~
2759~3-36 B IEE DESCRIPTION O~ TH~ D_AWINGS
Figs. lA, lB, and lC, when arranged together, are a bloGk diayraTn of a mobile telephone unit, a handset and a data terminal according to a irst embodiment of the present invention;
Fig. 2 is a flo~lchart of operation for switching from a voice communication mode to a data communication mode;
Fig. 3 is a circuit diagram of a switch; and Figs. 4A 4B, and 4C, when arranged together, show a block diagram of a mobile telephone unit according to a second embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Figs. lA, lB, and lC, when arranged together, show in block form a mobile telephone unit according to a first embodiment of the present invention. The mobile telephone unit has switching means in a data modem for effecting switching between a data communication mode and a voice communication mode.
The mobile telephone unit includes a transmitter/receiver unit (TRU) 1 generally having a 4b 1;~7~ 4 receiver l~, a transmitter 12, a controller 13, a~ I/O
port L4, and a du~lexer 15.
The receiver l.l ha~ a radio-frequency amplifier lla for amplifying a received ~ignal (radio-frequency ~ignal) comin~ in through the duplexer 15, a local o~cillator llb for generating a local frequency, a mixer llc for mixing the radio-frequency signal and the local frequency into an intermediate-frequency signal, an intermediate-frequency amplifier lld (including a limiter and a discriminator) for amplifying, controlling the amplitude of, and demodulating the intermediate-frequency signal, and an audio-frequency amplifier lle for amplifying an audio-frequency signal to a prescribed level.
The transmitter 12 has an audio-frequency amplifier 12a for amplifying an audio-frequency signal, an oscillator 12b for generating a radio-frequency signal serving a~ a ba~i~ for a radio wave to be transmitted, a modulator 12c for phase-modulating the radio-frequency signal from the oscillator 12b with the audio-frequency signal from the auio-frequency amplifier 12a, a preamplifier 12d for amplifying the modulated radio-frequency signal to a predetermined level, and power amplifier 12e for amplifying the radio-frequency ~ignal from the preamplifier 12d to a power level which is high enough to be able to radiate from an antenna. The duplexer 15 allow~ the antenna to be alternately used for transmitting and receiving signals.
78~tJ4 The receiver 11 and the transmitter 12 of the above con~truction are known.
The controller 13 comprises a CPU 13a, an address latch 13b, a RAM l3c, and a ROM 13d. The controller 13 ~erves to control the TRU 1 in its entirety, and issues switching commands (described later). The I/O port 14 transmits and receives control data between the TRU 1 and a control unit (cu) 2 and a data modem 3 through a data bus B.
The control unit 2 has an audio-frequency amplifier 21 for amplifying an audio-frequency ~ignal, a telephone tranmitter/receiver 22 for effecting communication with the calling or called party, an I/O port 23 for transmitting data to and receiving data from the TRU 1 and the data modem 3, a controller 24, and a key switch 25 composed of dial keys and function keys that are manually operated by the user to enter data. The control unit 2 corresponds to a normal mobile telephone handset and a cradle for accomodating the handset.
Control data established by the key switch 25 and the controller 24 of the control unit 2 is sent from the I/O
port 23 over the bus B to the controller 13 of the TRU 1 and a controller 34 (described later) of the data modem 3.
The telephone transmitter/receiver 22 of the control unit 2 is connected to the receiver 11 and the transmitter 12 of the TRU 1 through the audio-frequency amplifier 21, a signal line ~b, a switch 31 (described later) of the data 1;~78~i()4 modem 3, and a signal line Qa.
The data modem 3 comprises a line switching switch 31, a modem circuit 32, an I/O port 33, a controller 34, and an RS-232C interace port 35. The switch 31 is actuated by a signal from the I/O port 33 under the control of the controller 34 for connecting the signal line Q a connected to the receiver 11 and the transmitter 12 of the TRU 1 to either the control unit 2 over the signal line Qb or the modem circuit 32.
When the controller 34 controls the switch 31 to connect the signal line Qa to the modem circuit 32 through the I/O port 33, the modem circuit 32 demodulates data delivered from the TRU 1 through the signal line Qa and the switch 31, and modulates data entered from a data terminal 4 through the port 35 and the controller 34. The controller 34 comprises a CP[~ 34a, an address latch 34b, a RAM 34c, and a ROM 34d, and serves to decode the demodulated data from the modem circuit 32 and encode the data entered from the terminal 4 through the port 35.
Operation of the automobile telephone unit thus constructed will be described below.
First, a voice communication mode will be described.
It is assumed that at an initial stage the switch 31 of the data modem 3 connects the signal lines Qa, Qb to each other. The mobile telephone apparatus is in the voice communication mode.
A voice signal received by the TRU 1 and delivered 7~
275~ 6 froln the out~pu~ of the receiver 11 is sent via the siynal line ~a, the ~wit~h 31, the signal line Qb, and the audlo~frequen-y amplifier 21, and receivecl by the telephone transl-nitter/receiver 22. A voice siynal can be transmitted from the telephone transmitter/receiver 22 through the inverted p~th ko the transmitter 12 of the TRU 1, from which the siynal can be transmitted via the ~ntenna.
Data communication will now be described in detail with reference to Fig. 2.
The power supply of the mobile telephone unit is switched on. A wake-up tone is then confirmed, in step S1, through a loudspeaker (not shown) connected to the audio-frequency amplifier 21. Thereafter, a party to which data should be sent is called in an audio communication mode to thereby connect a channel.
Data or facsimile mode setting information (channel switching control information) is entered through the key switch 25 in s~ep S2. Such setting information is set by using, for example, one or a combination of numerals, letters, symbols, etc.
The setting information thus entered is recognized by the controller 24 of the control unit 2. After the settinq information has been encoded by the controller 24, it is delivered via the I/0 port 23 and the bus B to the TRU 1. The controller 13 of the TRU 1 recognizes the encoded setting information applied through the I/0 port 14 step S3. Then, the controller 13 sends a mode switching command having a predetermined data pattern (e.g., 1~:'7~04 FFFFH~ over the bus B to the data modem 3 in step S4. The controller 34 of the d~ta modem 3, which has been in an idling condition tor a monitor mode), recognizes the switching command delivered through ~he I/0 port 33, and then places the data modem 3 in a data communication mode, and effects the following operation in step S5. First, the controller 34 sends a hook signal to the controller 13 of the TRU 1. That is, the controller 34 sends a signal corresponding to an off-hook signal of the telephone transmitter/receiver for telephone communication, so that the connected channel will be held against being cut off.
The controller 3~ controls the switch 31 to disconnect the signal line ~ a from the signal line ~b and connect the signal line ~a to the modem circuit 32. As a result, the apparatus is switched from the voice communication mode to the data communication mode.
In a data communication modem initiated by outgoing signal transmission, a data signal delivered from the terminal 4 through the port 35 is temporarily stored in the RAM 34c of the controller 34. The stored data signal is read out and modulated by the modem circuit 32. The modulated data signal is sent from the modem circuit 32 through the switch 31 and the signal line ~a to the transmitter 12 of the TRU 1. The transmitter 12 modulates the radio-frequency signal with the modulated data signal, 1~7~jV~
and then ~end~ the signal through the duplexer lS and the antenna to a called station.
In a data communication mode initiated by incoming signal reception, a data signal received fr~m a calling party i~ sent from the receiver 1I via the ~ignal line Qa and the switch 3l to the modem circuit 32 of the data modem 3. The received data signal is demodulated by the modem circuit 32 and then stored in the RAM 34c of the controller 34. The stored demodulated data signal is decoded by the controller 34 and delivered through the port 35 to the terminal 4.
The switch 31 will be described in detail with reference to Fig. 3.
The switch 31 includes various electromagnetic relays as switching devices. However, semiconductor devices with a large ON/OFF ratio may also be used instead of such relays.
A relay SW 31a is controlled by the controller 34 via the I/O port 33 so as to be actuated or released by turning on or off a relay driving transistor Tr 3lc with a control signal from the controller 34. Four switches 31b are contacts of the relay SW 31a. When the relay SW 31a is released, the TRU 1 is connected through the signal lines Qa, Qb to the control unit 2. When the relay SW 31a is actuated, the TRU 1 is connected through the signal line Qa to the modem circuit 32. The arrows 31d in Fig. 3 indicate the directions in which signals are sent.
275~8-36 Figs. 4A, 4B, and 4C, when arranged together, show a mobile telephone unit according to a second embodiment o~ the present invention. This embodiment differs from that of Figs. lA, lB, and lC in that a switching box s is employed in place of the modem 3, the switching box 5 being similar to the modèm 3 except that no modem circuit 32 is included. An ou~put signal from the switch 31 is delivered via the port 35 to a modem or facsimile 6.
The switching box 5 has a simpler controller 51 for only recognizing a switching command and controlling the switch 31.
The controller 51 may be in the form of a one-chip microcomputer.
Operation of the second embodiment is as follows:
When data or facsimile mode setting information (line switching control information) is recognized by the controller 13 of the TRU 1, the controller 13 sends a switching command via the bus B to the switching box 5. In the switching box 5 which has been in an idling condition, the controller 51 receives the switching command and controls the switch 31 to disconnect the signal line Qa from the signal line Qb and connect the signal line ~a via the port 35 to the modem or facsimile 6, thus entering a data communication mode. Where the TRU 1 effects incoming signal reception, a data signal from a calling party is received by the receiver 11 and delivered therefrom via the signal line Qa, the switch 31, and the port 35 to the modem or facsimile 6. In case ~he TRU 1 performs outgoing signal transmission, a data signal is transmitted in the reversed process.
,;
1~78~ 4 275~- J6 As described above, the mobile telephone unit which has a control function to connect itself to a modem or facsimile can very easily effect switchiny between a data or facsimile communication mode and a voice communication mode with the control unit 2 available at the user's hand, no matter where the modem or facsimile transmitter/receiver 6 coupled by the modem 3 or the switching box 5 may be located.
With the present invention, therefore, switching between a first mode in which the transmitter/receiver unit is connected to a modem or facsimile and a second mode in which the transmitter~receiver unit is connected to a control unit can easily be performed by a control means at the user's hand.
Although certain preferred embodiments have been shown and described, it should be understood that many changes and modifications may be made therein without departiny from the scope of the appended claims.
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A line switching control system comprising:
(a) a transmitter/receiver means for transmitting and receiving signals through an antenna, (b) an input means combined with a handset;
(c) a switching means for effecting switching between a first mode in which a signal line from said transmitter/receiver means is connected to a modem and a second mode in which said signal line is connected to said handset; and (d) a control means for detecting line switching information which is inputted by said input means and for controlling said switching means in response to a switching command comprising coded line switching information which is sent from said handset to said modem via said transmitter/receiver means.
(a) a transmitter/receiver means for transmitting and receiving signals through an antenna, (b) an input means combined with a handset;
(c) a switching means for effecting switching between a first mode in which a signal line from said transmitter/receiver means is connected to a modem and a second mode in which said signal line is connected to said handset; and (d) a control means for detecting line switching information which is inputted by said input means and for controlling said switching means in response to a switching command comprising coded line switching information which is sent from said handset to said modem via said transmitter/receiver means.
2. A line switching control system according to claim 1, wherein said input means comprises a key switch composed of a plurality of dial keys and a plurality of function keys.
3. A line switching control system used in a mobile telephone set including a transmitter/receiver unit, a control unit which comprises a handset and a cradle, and a data modem, comprising:
(a) a key switch means combined with said handset for inputting line switching information;
(b) a common data bus for electrically connecting said transmitter/receiver unit, said control unit, and said modem;
(c) signal lines for electrically connecting said transmitter/receiver unit, said control unit, and said data modem, said signal lines including at least one signal line for transmitting an audio frequency signal;
(d) a first control means provided in said control unit for detecting said line switching information and generating a predetermined data pattern in response to said detection of said line switching information;
(e) a second control means provided in said data modem for detecting said predetermined data pattern sent from said first control means via said common data bus, said second control means generating a control signal in response to detection of said predetermined data pattern; and (f) a switching means provided in said data modem for effecting switching, in response to said control signals, between a first mode in which said signal lines from said transmitter/receiver unit are electrically connected to said data modem and a second mode in which said signal lines are electrically connected to said control unit.
(a) a key switch means combined with said handset for inputting line switching information;
(b) a common data bus for electrically connecting said transmitter/receiver unit, said control unit, and said modem;
(c) signal lines for electrically connecting said transmitter/receiver unit, said control unit, and said data modem, said signal lines including at least one signal line for transmitting an audio frequency signal;
(d) a first control means provided in said control unit for detecting said line switching information and generating a predetermined data pattern in response to said detection of said line switching information;
(e) a second control means provided in said data modem for detecting said predetermined data pattern sent from said first control means via said common data bus, said second control means generating a control signal in response to detection of said predetermined data pattern; and (f) a switching means provided in said data modem for effecting switching, in response to said control signals, between a first mode in which said signal lines from said transmitter/receiver unit are electrically connected to said data modem and a second mode in which said signal lines are electrically connected to said control unit.
4. A line switching control system according to claim 3, wherein said line switching information comprises one or more alphanumeric letters.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP244064/1986 | 1986-10-16 | ||
| JP61244064A JPS6399662A (en) | 1986-10-16 | 1986-10-16 | Line switching control system for car telephone equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1278604C true CA1278604C (en) | 1991-01-02 |
Family
ID=17113194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000549306A Expired - Lifetime CA1278604C (en) | 1986-10-16 | 1987-10-15 | Line switching control system for mobile communication |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4823373B1 (en) |
| JP (1) | JPS6399662A (en) |
| CA (1) | CA1278604C (en) |
| GB (1) | GB2198315B (en) |
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| IL90735A0 (en) * | 1988-08-26 | 1990-01-18 | Motorola Inc | Data message waiting |
| US4991197A (en) * | 1988-09-01 | 1991-02-05 | Intelligence Technology Corporation | Method and apparatus for controlling transmission of voice and data signals |
| US4977609A (en) * | 1988-10-28 | 1990-12-11 | Gte Cellular Communications Corporation | Interface circuit for telecommunications devices |
| USRE38645E1 (en) | 1989-01-19 | 2004-11-02 | Mlr, Llc | Portable hybrid communication system and methods |
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| JPH02128456U (en) * | 1989-03-30 | 1990-10-23 | ||
| US5200991A (en) * | 1989-06-23 | 1993-04-06 | Kabushiki Kaisha Toshiba | Image communication system including a mobile telephone set and a facsimile device |
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| US5890073A (en) * | 1990-06-20 | 1999-03-30 | Any Co. Ltd. | Mobile terminal capable of sending communication mode signals and a method thereof |
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| JP4076071B2 (en) * | 2002-08-19 | 2008-04-16 | アルパイン株式会社 | Communication method and vehicle communication apparatus between moving bodies |
| JP3984523B2 (en) * | 2002-09-27 | 2007-10-03 | アルパイン株式会社 | Inter-vehicle communication method |
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-
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- 1986-10-16 JP JP61244064A patent/JPS6399662A/en active Pending
-
1987
- 1987-10-15 CA CA000549306A patent/CA1278604C/en not_active Expired - Lifetime
- 1987-10-15 GB GB8724191A patent/GB2198315B/en not_active Expired - Fee Related
- 1987-10-16 US US07109021 patent/US4823373B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6399662A (en) | 1988-04-30 |
| GB2198315B (en) | 1991-03-13 |
| GB2198315A (en) | 1988-06-08 |
| GB8724191D0 (en) | 1987-11-18 |
| US4823373B1 (en) | 1999-08-24 |
| US4823373A (en) | 1989-04-18 |
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| MKLA | Lapsed | ||
| MKLA | Lapsed |
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