WO1985004989A1

WO1985004989A1 - Video equipment in particular a videorecorder

Info

Publication number: WO1985004989A1
Application number: PCT/EP1985/000173
Authority: WO
Inventors: Jürgen H. BRÜNING; Hans-Ullrich Wittrock
Original assignee: Itv Television & Video-Systeme Gmbh
Priority date: 1984-04-19
Filing date: 1985-04-17
Publication date: 1985-11-07
Also published as: DE3414858A1; AU4238185A; EP0177592A1

Abstract

Video equipment, in particular a videorecorder, for the recording and reproduction of video signals of different television systems, in particular colour television systems. The video equipment consists of a basic equipment (1) in which are arranged the electrical and mechanical components designed and usable for several given television systems, as well as of one or several standard modules (3) which can be fitted on to or inserted into the basic equipment, and in which are arranged all of the electrical components characteristic of a given television system and differing by their design and utilization from the other television systems. It is thus possible to convert the equipment from one television system to another one by simply changing over the standard module.

Description

Video device, in particular video recorder.

I. Technical field of the invention

The present invention relates to a video device, in particular a video recorder, for recording and reproducing video signals from different television systems, in particular color television systems.

II. State of the art

As a result of the different color standards and raster frequencies of the television signals in the different countries of the world, it has only been possible with considerable technical effort to use video devices independently of the various television systems, for example to record and reproduce non-standard television signals such as satellite television and earth reception near the border and to transmit video cassettes to exchange the limits of certain television systems.

One of the difficulties encountered here is the incompatibility of the recording and reproducing methods in the various television systems. For example, in the case of video recorders, the conditions are

Speeds of the tape feed and the speeds of rotation of the head disc in the helical track recording method in the NTSC system (USA, Japan) compared to the PAL system (Germany, Great Britain, Italy) different (1.4: 1 and 1.2: 1). In addition, the above-mentioned recording methods differ in that the chrominance information is processed differently, while the luminance information is processed approximately in the same way.

Video devices, in particular video recorders, are known which are made suitable for recording and playing back video signals from different television systems by arranging all the components necessary for recording and playing back in several TV systems and switching the device from one to another TV system can be. Such "multi-standard devices" are very complex and cause correspondingly high acquisition costs. They may also contain more than the owner currently needs, for example if the owner only wants to switch between two television systems, but the device is designed for more than two television systems. In addition, the desire arises, for example, to use a video recorder for several television systems, often only after the purchase, if, for example, certain video cassettes are brought from abroad. The owner of the device is therefore faced with the question of either buying one from the start or, if necessary, a second device or an expensive multi-standard device.

III. Task and solution of the task

The object underlying the invention was to create a video device, in particular a video recorder, which can also be retrofitted in a very simple manner to another television system, in particular a color fern viewing system. This object is achieved according to the invention in that the video device is characterized by a basic device in which the electrical and mechanical components of a conventional video device which are designed and usable in the same way for a plurality of predetermined television systems are arranged, and one or more standard modules which are based on the basic device can be plugged on or plugged into the basic device, the electrical connection between the basic device and the standard module being made via plug-in connections and in each standard module the electrical components which are characteristic of a specific predetermined television system and which differ in design and use from the other television systems are arranged.

In an advantageous embodiment of the subject matter of the invention, the following devices, inter alia, are arranged in or on the basic device:

The cassette drive with associated drive devices, video heads for tape scanning including drum and associated drive device, devices for recording and playback, as well as processing of audio and luminance signals including the necessary modulation, demodulation, amplifier and mixing stages, programmable servo control devices for the drum and cassette drive, devices for generating the electrical supply voltages, operating and control elements,

Connection sockets for camera, monitor and, if applicable, receiving and timing unit, connection contacts for the standard module, while the following devices are arranged in the standard module:

Devices for recording and playback, and processing of chrominance signals, devices for program-controlled generation of control signals for the servo control of the

Drives, and possibly devices for generating further system-related control signals, connection contacts for the basic device.

It has been found that it is possible to divide the electrical and mechanical components arranged, for example, in a conventional video recorder into two groups, one group comprising all components which are of the same design and interact in the same way for a predetermined number of different television systems, while the other group includes all components that are designed differently in different television systems and interact in different ways. The components of the first-mentioned group are arranged within a basic device, while the components of the second-mentioned group are provided in the form of standard modules, which can be connected to the basic device as required, for example in the form that they are inserted or inserted into a recess in the basic device .

In this way, the basic device and standard modules result in a video recorder which can be converted from one television system to another television system in an extremely simple manner, in which a standard module is simply exchanged for another standard module. This conversion is not technical either savvy users possible without difficulty. The basic device can be produced in large numbers in a simple manner, since it is of the same design for all television systems in question. The standard modules generally no longer contain any mechanically movable components, but only electrical components and can be constructed very small and light, for example in the form of a cassette, and can therefore also be replaced in a simple manner on the basic device like a cassette.

In this way, a full-fledged video recorder is created, the design according to the invention being applicable both to portable video recorders with battery and camera and to stationary devices.

IV. Brief description of the drawings.

In the following an embodiment of a video recorder according to the invention will be explained in more detail with reference to the accompanying drawings.

The drawings show:

1 shows a schematic representation of a video recorder with a basic device and a standard module arranged above it and not yet used; FIG. 2 shows a compilation of the individual devices arranged in the basic device or standard module of the video recorder according to FIG. 1;

3 shows a block diagram of the basic device of a video recorder according to FIG. 1; FIG. 4 shows in a block diagram a standard module for the PAL system that can be connected to the basic device according to FIG. 3; 5 shows in a block diagram a standard module for the NTSC system that can be connected to the basic device according to FIG. 3.

V. Description of an embodiment.

The video recorder shown in FIG. 1 consists of a basic device G, the housing 1 of which has a recess 2 on the rear into which a cassette-like standard module S can be inserted, which is electrically connected to the basic device G via connecting contacts 3.

Operating and display elements 5 are arranged on the front device G in the usual way on the front, while a coverable cassette compartment 4 for accommodating the video cassettes is located on the top.

For each basic unit G, a number of standard modules S with different internal structures are provided, by means of which the basic unit G can be converted to different television systems.

2 shows a compilation of the most important individual devices arranged on the one hand in the basic device G and on the other hand in the standard module S. This compilation is intended to explain how the division of the individual devices between the basic device and the standard module should take place and does not claim to be complete.

In any case, the cassette drive and the movable drum with the are arranged in the basic device Video heads with the respective drive devices and the servo control for these drives. Furthermore, the basic device contains all stages for recording and reproducing the luminance information and the audio information, that is to say, among other things, all amplifier stages for this, including the preamplifier, as well as modulation, demodulation and mixing stages. Finally, the basic device contains a supply voltage part, that is to say a power supply unit and / or a battery compartment, a connection socket field for connecting further devices, for example a camera and / or a monitor, and an outside control panel for receiving the mechanical control elements and the control displays. In addition, the connection contacts for the connection to the standard module are arranged on the basic device.

Each standard module includes All devices for the separation and processing of the chrominance information during recording and playback as well as other devices for program-controlled generation of the signals for the servo control of the drives and for the generation and processing of further secondary signals necessary for the different television systems, as well as devices for the function control of the overall device in a particular television system. Finally, the connection contacts for connection to the basic device are arranged on the standard module.

3 to 5 block diagrams show a possible interconnection of a basic device (FIG. 3) with two standard modules each designed as a cassette for the PAL system (FIG. 4) and for the NTSC system (FIG. 5). Overall, these circuit diagrams represent a generally known and customary interconnection of a video recorder and can be understood by the person skilled in the art from the circuit diagrams.

In the block diagrams of FIGS. 3, 4 and 5, the direct functions are only entered in a few blocks for a better overview, while reference numbers are given in the other blocks. These reference numerals relate to the functional description below and the combinations of the individual circuit parts of these devices which are known per se in their construction.

The standard modules shown in FIGS. 4 and 5 are connected to the basic device shown in FIG. 3 via connection contacts a to p.

The circuit parts and switching elements shown in the same way in FIGS. 4 and 5 can differ in their dimensions, for example with regard to the frequencies to be processed, depending on the system in question. 3 to 5, each device and circuit parts are shown in the upper half, which the servo control of the mechanical

Drives for the cassette drive and the movable drum with the video heads relate, while in the lower half all circuit parts are shown which relate to the recording and reproduction and processing of the image signals. The processing of the audio signals is not shown separately.

3 to 5, the reference numerals listed there are assigned to the circuit parts listed below, from which the mode of operation of the devices shown in FIGS. 3 to 5 can be seen directly in a manner which is generally understandable to a person skilled in the art. Functional description of block diagram of basic device according to FIG. 3.

Generally :

The block diagram is based on the NV 100 EG portable video recorder sold by National Panasonic (Matsushita). The technical details of this circuit example can be found in Service Instructions Order No. VRD-8206-099 Vol. 3. Deviations from this device are wanted for reasons of easier manageability of the block diagram, but have no significance with regard to the mode of operation.

Circuit description:

The video head drum is mounted on the axis of the head drum motor M and is driven by the rotation of this motor. The motor is an induction motor with permanent magnet armature driven with three approximately sinusoidal phase-shifted voltages. Two Hall sensors 2.3 recognize that emanating from the armature

Magnetic field and pass this information as an actual value to the control signal processor 6.3, which derives pulses for the control together with the pulse generator stages 7.3 and 8.3. The frequency generator 1.3 specified in the block diagram only serves to illustrate the mode of operation. The analog voltage coming from the control unit adjusts the frequency of the three supply voltages for the motor via an adjustment stage 5.3 and thus the speed and the phase position of the head drum.

The reference for the phase position is the vertical synchronism derived from the video signal impulse VSS 18.3, which also serves as the basis for the generation of the control impulse to be recorded on the magnetic tape. During playback, this control pulse serves to amplify and make a monostable MultiviDrator 31.3 variably displaceable to adjust the track position as a reference for the phase position of the head drum. A crystal oscillator serves as frequency reference.

The switchability between speed and phase coupling with regard to different frame rates is described below.

The control voltage for setting the third number is generated by deriving trigger pulses from the actual value pulses from 7.3 and 8.3, each of which starts a digital trapezoidal generator 25.3, 27.3. In frequency control, the following generator pulse serves as a comparison pulse. In the event of changes in the actual values, the time interval between the pulses is shortened and the position on the trapezoidal voltage is extended. The modulation values for the pulse generator 23.3 result from this ratio. Its output voltage, which varies in the pulse-pause ratio, is sieved (22.3).

The Hegel voltage for the phase adjustment is generated in a similar way, only one from the vertical sync pulse is used

(Recording) or the control pulse (playback) derived sample pulse as a comparison of the temporal position on the trapezoidal voltage. Here, too, a pulse width modulator 21.3 is controlled, the output voltage of which is also sieved 20.3 and, combined with the frequency control voltage, controls the speed adjuster 5.3. The capstan shaft is also a shaft driven directly by a 3-phase induction motor. The three-phase operating voltage is generated as with the head drum drive and does not require repeated explanation here.

A frequency generator 10.3 formed by a ring gear in connection with a pulse head supplies the actual value pulses for the speed control. A phase control via an impulse head with simultaneous influence by the tracking adjuster would also be technically feasible.

The control voltages for the speed adjuster 14.3 are generated, as in the case of head drum control via trigger stages, digital trapezoidal generators, pulse width modulators and subsequent sieving 33.3 40.3.

Any other type of regulation of speed and phase position is also conceivable. However, the generation of digital trapezoidal voltages has the advantage that the characteristics of the impulses can be influenced by changing program sequences.

So it is possible, by changing the quartz reference and programming the divider 30.3, 32.3, the servo control e.g. from 25 image changes / sec to 30 image changes / sec. switch. A practical example is the Matsushita IC MN 6165, which can be used for PAL and NTSC video recorders.

For luminance signal processing during recording (Y signal processing recording), this is entered at 56.3 fed video signal amplified 57.3 and freed from the color component with the ink carrier trap 52.3. This filter can be switched to separate different ink carrier frequencies. A combination of several filters is also conceivable, of which the required one is switched on. From here, the luminance signal reaches an predistortion stage 51.3 via an intermediate amplifier in order to improve the signal / noise ratio in the upper frequency range. In the clamp stage 50.3, the signal is clamped on the porch. This is necessary in order to obtain a reference level with the following white / black peak limitation 49.3. in the

Frequency modulator 48.3 is modulated with the luminance signal an AC voltage. The corner frequencies for black (synchro pulse roof + pre-emphasis peak) are 3.8 MHz, for white + pre-emphasis 4.8 MHz. The signal reaches the mixer stage 46.3 via a high-pass filter 47.3, which can also be designed to be switchable. Here the FM receives the chrominance signal coming from the plug-in module and its frequency is reduced. The signal mixture thus arrives in the recording amplifier 45.3 and from there via an A / W switch 54.3 to the video heads 53.3.

For the luminance signal processing during playback (Y signal recovery playback), the signal from the video heads 53.3 reaches two preamplifiers 61.3, each of which processes one channel. The head signal changeover 62.3 is carried out with a rectangular pulse synchronous with the respective field. In the subsequent amplifier 63.3, the higher-frequency FM component and the reduced color information are separated from one another and fed to the further stages. Before the FM signal passes through the drop-out compensator 64.3, the remnants of the color intermediate carrier are removed by a trap 55.3, which can in turn be switched. The signal reaches frequency demodulator 66.3 via a frequency response correction circuit 65.3. Interference signal reduction 58.3 and deemphasis 67.3 follow. The luminance signal is available again and is provided in mixing stage 68.3 with the regenerated color signal coming from the plug-in module. The CVBS (composite signal) reaches the video output 60.3 via the switch 59.3.

The non-standard-dependent levels are described below:

The auxiliary pulse processing 69.3 generates the keying and switching pulses required for processing from the video signal and other sources. In 70.3 the operating voltage and control information for the plug-in module are generated or received. Items 71.3 to 73.3 relate to the operation of the device and can be very different depending on the design. Items 74.3 to 76.3 also depend on the design of the device according to the manufacturer's specifications. Sound signal processing 77.3 and operating voltage supply 78.3 for the basic module are likewise only subject to design-related criteria. Since the latter stages do not relate to the invention or can be understood without further explanation, a functional description is omitted here.

The RF modulator 79.3 must be installed as close as possible to the RF output socket, as some official regulations on interference radiation must be observed. If the modulator is not to be used every time the Plug-in module to be changed, so it must be attached in the basic device so that an exchange is easily possible.

Functional description of block diagram PAL module Fig. 4.

Servo program control (servo program):

The crystal oscillator 2.4 is the reference source for the stabilization of the color subcarrier as well as for the servo control. For this reason, the oscillator voltage is routed via an output stage 1.4 and a plug contact to the servo control stage of the basic device. The control signals 3.4, 4.4, 5.4, 12.4, 18.4, 27.4 and 36.4 can be thought of as command words at certain levels in the basic device. One way of

Transmission would be binary codes, which would however make a decoder necessary on the basic device side. However, a simple direct voltage (switching voltage) per control command is also conceivable, but this would result in a few more plug contacts. Where only simple yes-no information is required, one could even do with plug-in contact coding.

For chrominance signal processing during recording (color signal processing - recording), the CVBS (composite signal) coming from the video input arrives at a bandpass filter 6.4, which only allows the chroma component to pass through with the color carrier frequency of 4.433 MHz. In a regulated amplifier 7.4 it is brought to a certain level, the value of which is kept constant by a control voltage 13.4. This control voltage is generated analogously to the amplitude of the burst pulse obtained in the key stage 14.4. In the main converter 8.4 it is Chroma signal mixed with an alternating voltage with a frequency of 5.06 MHz. In the following low-pass filter 9.4, the difference of 627 kHz is filtered out and passed through an amplifier 10.4 and a switch 15.4 to a plug contact of the PAL module. From there it gets into the basic device and is added to the FM recording signal. The 5.06 MHz AC voltage that is fed to the main converter is a product of the horizontal frequency (40fH) and a crystal oscillator 4.43 MHz. Using a special process, a revolving phase shift of

90 ° reached per line. Since there is another switchover between the two fields, the color intermediate carrier, one component of which is the multiplied horizontal frequency, is recorded on the magnetic tape in such a way that signals lying next to one another have a phase shift of 90 ° to one another. The ± 45º phase changes per line that characterize the PAL method are taken into account when selecting the phase direction.

For chrominance signal processing during playback (color signal processing - playback), the separated chroma signal from the preamplifier in the basic unit passes via a low-pass filter 19.4 and a regulated amplifier 20.4 to the main converter 21.4, where a 5.06 MHz alternating voltage is mixed in with the 627 kHz of the color subcarrier. Via a 4,433 MHz bandpass filter 22.4 and an amplifier stage, the chroma signal arrives at a delay line 23.4, which causes the signal to be delayed by 2 tH = 128 μs. Via a direct

A bypass part of the voltage is mixed in at the output of the VL. The ratio of the voltages and those caused by the revolving phase shift when opening If the opposite position of the undelayed and the delayed signal were reached, the errors caused by crosstalk between adjacent tracks are now eliminated. More detailed information with vector diagrams is available in the relevant literature.

The now finished chroma signal is fed to the output via an amplifier and a switch 15.4.

Again, the development of the 5.06 MHz AC voltage must be discussed, since its characteristic is important for the stability of the color signal. Misalignment of the head drum and magnetic tape properties cause time base errors (jitter) during playback. This has an extremely unpleasant effect on the color stability, since the color decoders in the television receivers cannot compensate for these time base errors. One tries to stabilize the signal already in the recorder.

The synchronizing signal is obtained from the luminance signal, which also has time errors 38.4. By

Multiplication 29.4, 30.4, 31.4 and 37.4 by a factor of 40, a signal of 627 kHz is generated (due to the vector switchover, the multiplier is exactly (40 + 1/8) fH), to which the time error component must also be added. In the secondary converter 34.4, an AC voltage with a frequency of 5.06 MHz is created by mixing with a frequency-stable 4.43 MHz signal, which in turn is generated by comparing the signal burst and quartz reference, and subsequent filtering. This contains a time error component. When mixed with the color intermediate carrier in the main converter 21.4, the errors of both signals are compensated for. A frequency-stable chroma signal is available at the output Available. A phase error correction circuit 40.4, which is activated by phase comparison between the output signal and the reference signal, acts on the vector switch 33.4 and eliminates any disturbances that are still present.

Functional description Block diagram NTSC module Fig. 5.

Servo program control (servo program)

The servo program control for an NTSC-compatible

Recorder can be seen in the same way as the control for PAL. Only the control command structure and the frequency of the reference oscillator (3.58 MHz) are different. In FIG. 5, corresponding assembly numerals are used for FIG. 4, which differ from the reference numerals 1.4-40.4 used in FIG. 4 only in the added final digit and run from 1.5 to 40.5.

In the chrominance signal processing (recording / reproduction) too, the stages are constructed in the same way as in FIG. 4 and are also largely identical. Due to the other color carrier frequency of 3,579 MHz, all are corresponding

Filters designed differently than in the PAL standard. Due to the missing ± 45 ° phase change per line, the vector switchover is different. When the horizontal frequency is multiplied, a multiplier of only 40, compared to (40 + 1/8), is therefore used, so that the intermediate color carrier is 15,750 x 40 = 630 kHz.

In the time error compensation, the frequency-stable voltage is obtained directly and not generated, and finally the delay line of the comb filter 23.5 is only 1 tH = 63.49 μs. Most of the components, especially the integrated circuits, can be used to process both standards.

Of course, the design of a video recorder according to the invention can also be used with other standards besides PAL and NTSC.

The SECAM standard, for example, is particularly common in the Eastern Bloc and the Middle East, as well as in France. There are different methods for processing magnetic tapes of SECAM signals, but they are also suitable for processing in recorders with a basic unit and plug-in modules. Two methods are briefly mentioned here:

The two frequency modulated color carriers 4.25 and

4.40 MHz, which are modulated with the color difference signals and sent out line sequentially, are processed like in PAL or NTSC by reducing them in converters in the lower frequency band of the external frame frequency spectrum. Since the crosstalk between the tracks does not play a role here, there is no need for a rotating phase change during recording and comb filter processing during playback.

The second possibility of reducing the color carrier frequencies by 1: 4 division when recording is mainly used in France. During playback, the signal is recovered by doubling the frequency twice.

Line and frame rate grid, as well as the luminance signal processing, are like PAL. For the magnetic tape recording of video signals, e.g. in Brazil and Argentina, you need PAL modules with color carrier processing according to PAL-M or PAL-N. Here the color carrier frequency and / or line and frame rate differ from the European PAL (according to PAL-BG).

There are still some other system-different types of video signal processing in magnetic tape devices, but they have no meaning in connection with the invention.

VI. Compilation of the structural units in FIGS. 3-5 with the reference numbers used:

Units in Fig. 3:

1.3 frequency generator

2.3 two Hall sensors

3.3 three driver stages

4.3 three differential amplifiers

5.3 Head drum speed setting

6.3 3-phase control signal generation

7.3 Actual value pulses speed

8.3 Actual value pulses phase position

9.3 Control track head

10.3 Capstan pulse head

11.3 three Hall sensors

12.3 three driver stages

13.3 three differential amplifiers

14.3 Capstan speed setting

15.3 3-phase control signal generation

16.3 Current stabilization

17.3 Capstan pulse processing

18.3 Vertical sync pulses (VSS)

19.3 Track position adjuster

20.3 low-pass filter (screening)

21.3 Pulse width modulator (head drum phase)

22.3 Low pass filter (sieving)

23.3 Pulse width modulator (head drum speed)

24.3 Trigger pulse generation

25.3 Digital trapezoidal pulse generation

26.3 Trigger pulse generation

27.3 Digital trapezoidal pulse generation

28.3 Vertical Syehron pulse processing

29.3 Recording / playback switching

30.3 Programmable divider

31.3 Monostable multivibrator tracking

32.3 Command processing standard identifier

33.3 low pass filter (screening)

34.3 Pulse width modulator (cap speed) 36.3 pulse width modulator (capstan phase)

37.3 Trigger pulse generation

38.3 Digital trapezoidal pulse generation

39.3 Trigger pulse generation

40.3 Digital trapezoidal pulse generation

41.3 Recording / playback switching

42.3 divider

43.3 Recording / playback switching

44.3 Decoder for special function commands (still picture,

Slow motion, etc.) 45.3 Recording amplifier

46.3 Mixing stage (luminance + chrominance signal) 47.3 High pass filter (switchable) 48.3 Frequency modulator 49.3 White / black level clipping 50.3 Clamping

51.3 Preemphasis (frequency-dependent predistortion) 52.3 Low-pass filter (Chromafalle), switchable 53.3 Video heads

54.3 Recording / playback switching 55.3 Color subcarrier trap (switchable) 56.3 Video signal input 57.3 Controlled amplifier 58.3 Interference suppression

59.3 Direct signal / playback ab es igna l conversion 60.3 Video signal output 61.3 Two preamplifiers 62.3 Head switching 63.3 Regulated amplifier 64.3 Drop-out compensation 65.3 Frequency response correction 66.3 Frequency demodulator

67.3 Deemphasis (frequency-dependent equalization) 68.3 Mixing stage (luminance + chrominance signal) 69.3 Pulse and sync pulse processing 70.3 Operating voltage generation, system display, safety control 71.3 Control buttons

72.3 Display functions

73.3 External connection sockets

74.3 Sequence and mechanical control

75.3 Sensor control

76.3 Mechanism, chassis

77.3 Sound signal processing

78.3 Operating voltage supply

79.3 High frequency modulator

Units in Fig. 4:

1.4 Oscillator output 4.43 MHz

2.4 crystal oscillator 4.43 MHz

3.4 Control signal PAL / NTSC

4.4 Special function commands for still picture, slow motion etc.

(PAL / NTSC) 5.4 Control signal for switching the low-pass filter (Chromafalle) 6.4 Band-pass filter 4.43 MHz 7.4 Regulated amplifier 8.4 Main converter 627 kHz (recording) 9.4 Low-pass filter

10.4 Recording amplifier

11.4 Color switch (recording / playback)

12.4 Control signal for switching the high-pass filter

13.4 Control voltage

14.4 Burst key level

15.4 Recording / playback switching

16.4 Burst key level

17.4 Recording / playback switching

18.4 Control signal for switching the color intermediate carrier trap

19.4 Low pass filter

20.4 Controlled amplifier

21.4 Main converter 4.43 MHz (playback)

22.4 Bandpass filter 23. 4 2-H delay line

24th 4 voltage controlled crystal oscillator 4.43 MHz

25th 4 phase comparison

26. 4 Recording / playback switching

27 .4 Control signal for switching the preamplifier

28 4 operating voltage supply

29. 4 phase comparison

30,. 4 2.5 MHz voltage controlled oscillator

31 4 1: 4 ring dividers

32. 4 4-phase vector signal.

33. 4 bandpass filters

34. 4 auxiliary converters 5.06 MHz

35 .4 Bandpass filter

36 .4 Standard identifier, safety control

37 .4 divider 1: 160

38 .4 Touch and sync pulse processing

39. 4 phase selector control PAL / NTSC

40. 4 phase error correction circuit

Units in Fig. 5:

1.5 Oscillator output 3.58 MHz

2.5 crystal oscillator 3.58 MHz

3.5 Control signal PAL / NTSC

4.5 Special function commands for still picture, slow motion etc.

(PAL / NTSC)

5.5 Control signal for switching the low-pass filter (Chromafalle)

6.5 bandpass filter 3.58 MHz

7.5 Controlled amplifier

8.5 Main converter 627 kHz (recording)

9.5 Low pass filter 10.5 Recording amplifier 11.5 Color switch (recording / playback) 12.5 Control signal for switching the high-pass filter 13.5 Control voltage 14.5 Burst key stage

15.5 Record / Playback Switch 16.5 Burst Key Level

17.5 Record / Play Switch

18.5 Control signal for switching the color subcarrier trap 19.5 Low-pass filter 20.5 Regulated amplifier 21.5 Main converter 3.58 MHz (playback) 22.5 Band-pass filter 23.5 1-H delay line

24.5 Voltage controlled crystal oscillator 3.58 MHz 25.5 phase comparison

26.5 Recording / playback switchover 27.5 Control signal for switching the preamplifier 28.5 Operating voltage supply 29.5 Phase comparison

30.5 Voltage controlled oscillator 2.5 MHz 31.5 1: 4 ring divider 32.5 4-phase vector signal 33.5 Bandpass filter 34.5 Auxiliary converter 4.2 MHz 35.5 Bandpass filter

36.5 Standard identifier, safety control 37.5 divider 1: 160

38.5 Pulse and sync pulse processing 39.5 Phase selector control PAL / NTSC 40.5 Phase error correction circuit

Claims

1. Video device, in particular video recorder, for recording and reproducing video signals from different television systems, in particular color television systems, characterized by a basic device (G) in which the electrical and mechanical components of a conventional video device, which are designed and usable in the same way for a plurality of specified television systems, are arranged as well as one or more standard modules (S) that can be plugged onto the basic device (G) or plugged into the basic device, whereby the electrical connection between the basic device (G) and the standard module (S) takes place via plug connections (3) and in each standard module (S) the electrical components which are characteristic of a specific predetermined television system and which differ from one another in terms of design and use are arranged.

2. Video recorder according to claim 1, characterized in that the following devices are arranged in or on the basic device (G):

The cassette drive with associated drive devices, video heads for tape scanning including drum and associated drive device, devices for recording and playback, as well as processing of audio and luminance signals including the necessary modulation, demodulation, amplifier and mixing stages, programmable servo control devices for the drum and cassette drive, devices for generating the electrical supply voltages,. Operating and control elements,

Connection sockets for camera, monitor and, if applicable, receiving and timing unit, connection contacts for the standard module,

while in the standard module i.a. the following devices are arranged:

Devices for recording and playback, and processing of chrominance signals, devices for program-controlled generation of control signals for the servo control of the drives, and possibly devices for generating further system-related control signals, connection contacts for the basic device.

Video recorder according to Claim 2, characterized in that the basic device (G) has a recess (2), into each of which a standard module (S) can be inserted.

4. Video recorder according to claim 2 or 3, characterized in that the standard module is designed as a flat cassette which can be inserted or inserted into a cassette compartment arranged in the basic device.