KR940005718Y1 - Signal processing system of double deck vcr - Google Patents

Abstract

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Description

Double Deck VCR Signal Processing System

1 is a circuit diagram showing a conventional signal processing system.

2 is a circuit diagram showing a signal processing system of the present invention.

3 is a signal flow diagram showing a signal processing method of the present invention.

4 is a circuit diagram showing another embodiment of the signal processing system of the present invention.

5a, b is a circuit diagram showing another embodiment of the VHS deck unit in the signal processing system of the present invention.

* Explanation of symbols for main parts of the drawings

11: micom 12: keyboard

13: Tuner part 14: VHS type deck part

15: 8 mm tape deck portion 19: high frequency modulation portion

16, 17, 18, 23, 44, 45, 50: analog switch

21: recorder 22: playback system

41: recording processing system 42: recording amplifier

43, 46: head 47: regenerative amplifier

48: playback processing system 49: buffer

51 amplifier 52, 53 envelope detector

54, 55: integrator 56: comparative amplifier

57: reference voltage generator

The present invention records and reproduces broadcast and line input signals on a video tape in a double-deck VCR equipped with VCR and VHS VCRs using 8mm tape. Of course, the present invention relates to a signal processing system of a double-deck VCR that performs a dubbing operation. In particular, an 8mm tape VCR performs only a playback operation, and a VHS type VCR performs a recording and playback operation. The present invention relates to a signal processing system of a double-deck VCR that allows a VHS VCR to dub a reproduction signal as well as to improve image quality during dubbing.

In the conventional double deck VCR, as shown in FIG. 1, a video signal is output to a tuner unit 1 for outputting a broadcast signal of a channel selected from a reception signal of an antenna ANT1, and 8 mm tape and VHS tape. 8 mm tape deck portion 2 and VHS system deck unit 3 for recording and reproducing, output signals of the tuner unit 1, and outputs of VHS system deck unit 3 and 8 mm tape deck unit 2 A multiplexer (4) (5) for selecting a signal and inputting it to the 8 mm tape deck portion (2) and the VHS system deck portion (3), respectively, and a resistor (R1) for controlling the selection of the multiplexer (4) (5). And a multiplexer (7) for selectively outputting an output signal from the selection switch (6), the 8 mm tape deck portion (2) and the VHS system deck portion (3), and a resistor for controlling the selection of the multiplexer (7). (R2) and the selector switch 8, and a high frequency modulator 9 for modulating the output signal of the multiplexer 7 to a high frequency (TV) receiver. Castle was.

In the drawing description of FIG. 1, reference numeral B + denotes a power source.

The operation of the conventional double deck VCR configured as described above is as follows.

The 8 mm tape deck portion 2 and the VHS system deck portion 3 are set in a recording state, and the selector switch 6 is switched so that the multiplexers 4 and 5 select the signals of the input terminals A1 and A2. When outputting, the broadcast signal tuned by the tuner section 1 is output to the 8 mm tape deck section 2 and the VHS system deck section 3 through the multiplexers 4 and 5, respectively, and 8 mm. Recorded on tape and VHS tape.

When the video signal is to be reproduced, the 8 mm tape deck portion 2 is brought into the reproducing state, and the selector switch 8 is switched so that the multiplexer 7 selectively outputs the signal of the input terminal A3. The reproduction signal of the deck unit 2 is transmitted through the multiplexer 7, modulated to a high frequency by the high frequency modulator 9, and output to the TV receiver. Causes the output signal of the input terminal B3 to be selectively outputted, the reproduction signal of the VHS deck unit 3 is modulated at high frequency by the high frequency modulator 9 and output to the TV receiver.

In the case of dubbing, if the 8 mm tape deck portion 2 and the VHS system deck portion 3 are brought into a playback and recording state, respectively, and the multiplexer 5 selectively outputs the signal of the input terminal B2, The playback signal of the 8 mm tape deck portion 2 is input to the VHS deck portion 3 through the multiplexer 5 and recorded therein, and the 8 mm tape deck portion 2 and the VHS system deck portion 3 are respectively recorded. And when the multiplexer 4 selects and outputs the signal of the input terminal B1 in a regenerating state, the reproducing signal of the VHS system deck unit 3 is transmitted to the 8 mm tape deck unit 2 through the multiplexer 4. It is input and recorded.

However, in the conventional double deck VCR as described above, the 8 mm tape deck unit and the VHS system deck unit both perform recording and reproducing operations so that the video signal can be recorded and reproduced regardless of the 8 mm tape and VHS system tape. Of course, the dubbing operation can be performed, but VHS tape is widely used and popularized all over the world, while 8mm tape is an early stage that is distributed only to camcorders with integrated cameras and VCRs. In addition, the 8mm tape deck unit does not need to record almost any video signal, so that a recording operation can be performed without a need for an expensive multi-tuner or two tuner units in which a tuner unit can simultaneously tune two broadcast signals. It has to be used, which puts a lot of economic burden on the user. Empty the need to select the operating functions and a lot of hassle share exchange, of course, in many cases due to the immaturity of the operation selection switch do not select exactly the desired behavior.

The present invention solves the inconvenience of the conventional double deck VCR in the double deck VCR, and as a technical means that makes it possible to use the double deck VCR more conveniently, (1). In the present invention, the inconvenience of requiring a plurality of key operations to perform a dubbing operation in a conventional double deck VCR enables the automatic operation of a dubbing operation by a microcomputer with only one touch key operation, (2). In the present invention, a disadvantage of image quality deterioration caused by a reproduction RF signal passing through an image signal processing system in the dubbing mode is intended to improve image quality by allowing a reproduction RF signal to be recorded directly without passing through the image signal processing system.

That is, in the present invention, when the conventional double deck VCR system is operated, in order to eliminate the inconvenience of the user manually operating, and to realize the dubbing mode, the conventional 1.8 mm deck is put into the regeneration mode. Enter the play key to activate, 2. Select the VHS record key to drive the VHS deck to record, and 3. Select the manual input signal to switch the switch 6 to select the multiplexer 5; In the present invention, by the control of the microcomputer 11, 1. When the user inputs a dubbing key, the user inputs one touch key, 2. The microcomputer 11 performs the conventional three-step operation at once, In addition, by controlling the microcomputer 11, in the other recording modes (1st deck = recording, 2nd deck = playback, or 1st deck = 2nd deck = simultaneous playback), a double key configured to automatically operate by inputting the first key Deck VCR Signal Processing System It is intended to provide.

Therefore, the 8 mm deck is simply configured to be exclusively for reproduction, and thus, the automatic switching of the analog switches 16, 17 and 18 by the control of the microcomputer 11 and the automation of each operation are thereby performed. As a result, 8 mm playback dedicated deck is constructed for convenient operation of the control system. In addition, the present invention is intended to improve image quality compared to the conventional double deck VCR system dubbing. Since the signal processing system is passed from the 1st deck and the 2nd deck, the main cause of the image quality deterioration is derived. In particular, when dubbing from 8 mm to VHS, the relative deterioration of image quality occurred more significantly than dubbing to VHS from 8 mm to 8 mm. In order to solve the above problems, the present invention records an RF signal output from an 8 mm deck tape on a tape without going through a signal processing system. In addition to improving image quality deterioration caused by hitting, the microcomputer 11 performs switching control without passing through a signal processing system with one touch key input, thereby providing a signal system of a double deck VCR that guarantees convenient device operation. For the purpose.

As described above, the present invention deviates from the technology of simply changing the design of the 8-mm tape deck part for regeneration in a known double-deck VCR, and the present invention was devised to solve the above-mentioned problems. The tape deck unit performs only the reproducing operation, the VHS type deck unit performs both the recording and reproducing operation so that playback and viewing are possible regardless of 8 mm tape and VHS type tape, and broadcast signals and line input signals are recorded on the VHS type tape. In addition to performing a dubbing operation of recording a playback signal of 8 mm tape on a VHS tape, the image quality is not degraded during dubbing, and the user can perform a desired operation simply by selecting an operation mode. It is an object of the present invention to provide a signal processing system of a double-deck VCR. It will be described in detail with reference to the drawings.

2 is a circuit diagram of a signal processing system of the present invention, as shown therein, a microcomputer 11 for controlling the overall operation of the system, and a keyboard unit 12 for inputting an operation mode signal to the microcomputer 11. A tuner unit 13 for outputting a broadcast signal of a channel selected from the received signal of the antenna ANT11, a VHS system deck unit 14 for recording and reproducing video signals, and an 8 mm tape deck unit dedicated to reproduction; A first analog switch 16 for selectively outputting a line input signal LS or an output signal of the 8 mm tape deck unit 15 under the control of the microcomputer 11, and the microcomputer 11; A second analog switch 17 which selects an output signal of the first analog switch 16 or the tuner unit 13 and outputs it as a recording signal of the VHS deck unit 14; The 8 mm tape deck portion 15 or the second analog switch 17 under control of (11). High frequency modulation to convert the output signal of the third analog switch 18 and the output signal of the output signal or the VHS system deck unit 14 and the output signal of the third analog switch 18 to a high frequency modulation It consisted of part 19.

The VHS system deck unit 14 includes a recording system 21 for recording a video signal on a VHS system tape, a reproducing system 22 for reproducing the video signal, and a second analog switch (1) under the control of the microcomputer (11). And an analog switch 23 for inputting the output signal of 17) to the recording system 21 and outputting the reproduction signal of the reproduction system 22 to the third analog switch 18.

The operation of the signal processing system of the present invention configured as described above will be described in detail with reference to the signal flowchart of FIG.

When the user operates the keyboard unit 12 and the tuner recording mode signal is input in step 30, the microcomputer 11 has the movable terminal of the analog switches 17 and 23 in one step 31 fixed terminal a17. The control signals CS12 and CS13 are output to be connected to the a23, and the broadcast signal output from the tuner unit 13 is operated by operating the recorder 21 so that the recorder 21 is switched through the switches 17 and 23. Is inputted and recorded, and when the line write mode signal is input in step 32, the movable terminals of the switches 16, 17, and 23 are connected to the fixed terminals a16, a17, and a23 in step 33, respectively. The control signals CS11, CS12, CS3 are outputted, and the recorder 21 is operated so that the line input signal LS is input and recorded in the recorder 21 through the switches 16, 17, and 23 sequentially.

In the dubbing mode in step 34, the control signal CS11- is connected so that the movable terminals of the switches 16, 17, 28, and 23 are connected to the fixed terminals b16, b17, b18, and a23 in step 35, respectively. CS14), the recorder 21 is operated, and the 8 mm tape deck portion 15 is operated so that the reproduction signal of the 8 mm tape deck portion 15 is transmitted from the high frequency modulator 19 through the switch 18. After being converted to high frequency, the output signal is output to the TV receiver, and the reproduction signal of the 8 mm tape deck unit 15 is input and recorded to the recorder 21 through the switches 16, 17, and 18 sequentially.

In the case of the VHS regeneration mode in step 36, in step 37, the movable terminals of the switches 18 and 23 are connected to the fixed terminals a18 and b23, and the regeneration system 22 is operated to operate the regeneration system. If the reproduction signal of (22) is modulated to high frequency by the high frequency modulator 19 sequentially through the switches 23 and 18, and then output to the TV receiver, in step 38 the step (8) In 39, the movable terminal of the third analog switch 18 is connected to the fixed terminal b18, and the 8 mm tape deck portion 15 is operated so that the reproduction signal of the 8 mm tape deck portion 15 is switched. Through the high frequency modulator 19 is converted into a high frequency signal through the TV receiver.

When the tuner recording mode or the line recording mode is performed in the above, the 8 mm tape deck unit 15 of the 8 mm tape deck unit 15 is recorded while the recorder 21 records the broadcast signal or the line input signal LS simultaneously. You can also watch the playback signal.

On the other hand, Figure 4 is a circuit diagram showing another embodiment of the signal processing system of the present invention, as shown therein, the recording system 21 of the VHS deck unit 14, the recording processing system for processing to record the video signal 41, a recording amplifier 42 for amplifying the video signal and applying it to the head 43, and a video signal to be recorded while being switched under the control of the microcomputer 11, directly input or recording the recording amplifier 42. An analog switch 44, 45 for inputting the recording amplifier 42 through the processing system 41, and the 8 mm tape reproducing system 15 is provided with a reproducing amplifier which amplifies the reproducing signal of the head 46. 47), a regeneration processing system 48 for reproducing the output signal of the reproducing amplifier 47, and a buffer 49 and a microcomputer 11 for buffering and amplifying the output signal of the reproducing amplifier 47. According to the analog switch 50 for selectively outputting the output signal of the reproduction processing system 48 or the buffer 49 accordingly It was.

Another embodiment of the signal processing system of the present invention configured as described above has a VHS deck unit having the movable terminals of the switches 44 and 45 connected to the fixed terminals b44 and b45 in the tuner recording mode or the line recording mode. The broadcast signal or the line input signal LS inputted to (14) is processed by the recording processing system 41 through the switch 44, amplified by the recording amplifier 42 through the switch 45, and then the head 43 In the 8mm tape regeneration mode, the movable terminal of the switch 50 is connected to the fixed terminal b50 so that the regeneration signal of the head 46 is amplified by the regeneration amplifier 47 and regenerated. After the regeneration process is performed in the processing system 48, it is output through the switch 50.

In the dubbing mode, the movable terminals of the switches 16, 17, and 23 are connected to the fixed terminals b16, b17, and a23 as described above, and the movable terminals of the switches 44, 45, and 50 are fixed terminals ( control is connected to a44, a45, a50).

Then, the reproduction signal of the head 46 is amplified in the reproduction amplifier 47 and the buffer 49, and sequentially in the recording amplifier 42 through the switches 50, 16, 17, 23, 44, 45, It is applied to the head 43 and recorded.

FIG. 5A is a circuit diagram showing another embodiment of the present invention. As shown therein, an amplifier 51 for amplifying an output signal of the analog switch 44 and outputting the analog signal to the analog switch 45, and the amplifier 51 And envelope detectors 52 and 53 for detecting the envelope of the output signal of the recording processing system 41, integrators 54 and 55 for integrating the output signal of the envelope detectors 52 and 53, and Comparing amplification of the output signal of the integrators (54) and (55) is configured as a comparative amplifier (56) for controlling the amplification gain of the amplifier (51).

According to another embodiment of the present invention, the envelope detector 53 detects the envelope from the output signal of the recording processing system 41 in the no-signal state in the dubbing mode, and the integrator 55 integrates the comparative amplifier 56. Supply a reference voltage.

Then, the image signal to be recorded is amplified by the amplifier 51, the envelope detector 52 detects the envelope from the output signal of the amplifier 51, and the integrator 54 is integrated and input to the comparison amplifier 56 as a comparison signal. .

The comparison amplifier 56 then compares the output signal levels of the integrators 54 and 55, and adjusts the gain of the amplifier 51 as a comparison signal to adjust the level of the video signal recorded on the VHS tape.

Another embodiment of the present invention is to adjust the level of the video signal to be recorded in the dubbing mode, the picture quality is very clear during playback.

FIG. 5B is a circuit diagram showing another embodiment of the present invention. As shown therein, a separate reference voltage generator 57 is used instead of supplying a reference voltage as an output signal of the recording processing system 41 in the dubbing mode. By supplying a reference voltage as shown in FIG.

As described in detail above, the present invention allows the 8 mm tape VCR to perform only the reproducing operation, and the VHS type VCR performs the recording and reproducing operation, so that playback can be viewed and viewed regardless of the 8 mm tape and the VHS type tape, and the operation is simple. In addition, by removing unnecessary parts, it is possible to remove the economic burden of the user, as well as to improve the image quality when dubbing.

Claims (7)

A microcomputer 11 for controlling the operation of the entire system, a keyboard unit 12 for inputting various operation mode signals to the microcomputer 11, and a tuner for outputting a broadcast signal of a channel selected from the reception signal of the antenna ANT11. A line input signal LS under the control of the unit 13, a VHS system deck unit 14 for recording and reproducing video signals, an 8 mm tape deck unit 15 for reproduction only, and the microcomputer 11; Alternatively, the first analog switch 16 for selectively outputting the output signal of the 8 mm tape deck unit 15 and the first analog switch 16 or the tuner unit 13 under the control of the microcomputer 11. A second analog switch 17 for outputting the output signal as a recording signal of the deck unit 14, and the 8 mm tape deck unit 15 or the second analog switch 17 under the control of the microcomputer 11; A third analog signal for selectively outputting the output signal of the < RTI ID = 0.0 > 1-touch input via the keyboard unit 12, comprising a position 18 and a high frequency modulator 19 for converting the output signal of the third analog switch 18 into a high frequency and outputting the signal to a TV receiver. A signal processing system of a double deck VCR (MIC), characterized in that the micom (11) interlocked control the first to third analog switches (16, 17, 18) by a dubbing key. 2. The VHS deck unit 14 according to claim 1 is characterized in that the recording system 21 records video signals on a VHS tape, the playback system 22 reproduces video signals, and the microcomputer 11 under the control of the microcomputer 11. And an analog switch 23 for inputting an output signal of the second analog switch 17 to the recording system 21 and outputting a reproduction signal of the reproducing system 22 to the third analog switch 18. Double deck VSI signal processing system. The recording system 21 of the VHS deck unit 14 includes: a recording processing system 41 for processing to record a video signal, and recording for amplifying the video signal and applying it to the head 43. An analog switch for switching the amplifier 42 and the image signal to be recorded under the control of the microcomputer 11 to the recording amplifier 42 directly through the recording amplifier 42 or through the recording processing system 41 ( 44 and 45, the 8mm tape reproducing system 15 includes a reproducing amplifier 47 for amplifying the reproducing signal of the head 46 and a reproducing process for reproducing the output signal of the reproducing amplifier 47. The processing system 48, the buffer 49 for buffering and amplifying the output signal of the reproduction amplifier 47, and the output signal of the reproduction processing system 48 or the buffer 49 under the control of the microcomputer 11 Double deck VRC (VCR) signal processing system characterized by consisting of an analog switching (50) for selective output. 4. The amplifier of claim 3, wherein the amplifier 51 amplifies the output signal of the analog switch 44 and outputs the analog signal to the analog switch 45, and the envelope detector 52 detects an envelope in the output signal of the amplifier 51. And an integrator 54 for integrating the output signal of the envelope detector 52 and a comparative amplifier 56 for controlling amplification gain of the amplifier 51 by comparatively amplifying the output signal of the integrator 54. Double deck VRC (VCR) signal processing system characterized in that the configuration. The comparison amplifier (56) according to claim 4, wherein an envelope detector (53) for detecting an envelope of an output signal of said recording processing system (41) and an integrator (55) for integrating an output signal of said envelope detector (53) are used. The signal processing system of the double deck VCR (VCR) characterized by supplying a reference voltage. 5. The signal processing system of a double deck VCR according to claim 4, wherein the reference voltage of the comparison amplifier is generated by a reference voltage generator. The movable terminal of the first analog switch 16 is connected to the fixed terminal b16 according to the control of the microcomputer 12 in the dubbing mode, and the movable terminal of the second analog switch 17 according to claim 2. Is connected to the fixed terminal b17, the movable terminal of the third analog switch 18 is connected to the fixed terminal b18, and the movable terminal of the analog switch 23 of the VHS deck unit 14 is fixed to the fixed terminal a23. ) And directly record the reproduced RF signal of the 8 mm tape deck unit 15 to the VHS deck unit 14 without passing through the associative processing system. In addition, the high frequency modulation unit 19 The signal processing system of a double deck VCR (VCR) characterized in that the output to the TV receiver.