KR940002835Y1 - Automatic reproducing circuit for multiple audio signal - Google Patents

Abstract

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Description

Automatic playback circuit of voice multiple signal

1 shows a conventional voice multiple circuit, in which (a) is a circuit diagram during recording, (b) is a circuit diagram during reproduction, and (c) is a frequency spectrum thereof.

2 is a circuit diagram showing an automatic reproduction circuit of an audio multiple signal according to the present invention.

* Explanation of symbols for main parts of the drawings

10: regeneration circuit 11: subtractor

12: adder 20: first switching circuit

30 control circuit 40 second switching means

50: amplification unit 60: display means

61: micom 62: character generator

63 mixer section R1 to R13 resistance

D1 to D3: Diodes INV1 to INV3: Inverter

SW1 to SW4: switch

(L + R) / 2, M / M: Main audio multiple signal and selection signal

(L-R) / 2, SUB / SUB: Sub-audio multiple signal and selection signal

S / M: Stereo / mono select signal TR1: Transistor

VIL: Selection signal of voice multiple mode

V: Video signal M: Mono selection signal

The present invention relates to all systems capable of recording and reproducing voice multiplexing, and to an automatic reproducing circuit of a voice multiple signal which is automatically switched and reproduced according to a recorded mode and a selected voice multiple signal during reproduction.

In recent years, the importance of linguistics is very high, and foreign languages and Korean languages are simultaneously transmitted by broadcasting stations, and users can select and listen to them.

In a video camera currently equipped with such a system of voice multiplexing, the voice multiplexing scheme is as shown in Figures 1a, b and c.

That is, the voice signals L and R input through the L channel and the R channel are output by the adder 1 as L + R voice signals and simultaneously by the subtracter 2 as L-R voice signals.

The audio signal output by the subtractor 2 of each adder 1 is output as a voice signal of (L + R) / 2, (LR) / 2 by half-life (3) and (4), respectively. The output audio signal is mixed by the multiplier 5, and the mixed audio signal is applied to the multiplier 6, and the input video signal V and the mixed audio signal are applied to the multiplier 6 and input. After mixing with the video signal (V) to be recorded on the magnetic medium.

On the other hand, the audio signals of (L + R) / 2 and (L-R) / 2 recorded as described above are applied to each of the adder 12 and the subtractor 11, and are output as the L and R audio signals and reproduced.

Also, as shown in the frequency spectrum of FIG. 1C, audio multiple tapes recorded in English (1.5 MHZ) and Japanese (1.7 MHZ) in each frequency band are reproduced in stereo even during reproduction.

In the video camera in which the main multi-signal input English and Western multi-signal Japanese are recorded and played back in a stereo manner as described above, the English and Japanese frequency bands recorded in about 1.5 MHZ and 1.7 MHZ, respectively, There was a problem that you can not listen to only Japanese.

In addition, another problem of the conventional voice multiplexing method is that it does not reproduce correctly because the final output is mixed because it reproduces like stereo even during tape playback.

The present invention is to solve the above problems, and the object of the present invention is to record a stereo mode and a voice mode, respectively, in the recorded video camera, the recorded signal is the main audio multiple signal, sub-audio according to the user's taste An object of the present invention is to provide an automatic reproduction circuit of an audio multiple signal which is automatically controlled and output according to a selected signal among multiple signals, stereo and mono, and a recorded mode.

A feature of the present invention for achieving the above object is an audio processing circuit which is recorded after the multiplexed voice signals input through the L and R channels are modulated and mixed according to the set voice mode and stereo mode, and by the audio processing circuit. A voice multiple circuit comprising a reproduction circuit in which recorded audio multiple signals are separated and reproduced as original signals, comprising: a first switching unit for selecting a main audio multiple signal, a sub audio multiple signal, a stereo and a mono selection signal according to a user's preference; A control circuit for outputting the output signal from the playback circuit according to a circuit, an input playback selection signal and a selection signal of the first switching circuit, and a signal output from the control circuit. A second switching circuit which is automatically switched to pass the output, and an output through the second switching means Is in the auto-recovery circuit of the audio signal is a multi-state is output through the amplifier unit and the L, R channel output to the L, R channel, the sound multiplex signal amplifier configured as a display means is displayed on the screen.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a circuit diagram showing an automatic regeneration circuit of a voice multiple signal according to the present invention, wherein the input voice multiple signal (L) (R) signal is equal to the (L + R) / 2, (LR) / 2 main voice multiple signal. The reproducing circuit 10, which is recorded as a sub-audio multiple signal and reproduced as the original signal by the subtractor 11 and the adder 12, is configured in the same manner as before.

Here, R1 to R7 are voltage drop resistors.

On the other hand, the first switching circuit 20 in which the multi-mode and the stereo mode is set by the user's selection is the sub-audio multiple signal (SUB / SUB), the main audio multiple signal (M / M), stereo and mono (S / It is equipped with the slide switch which can select M).

The control circuit 30 outputs a control signal for selecting the output of the reproduction circuit 10 according to the signal output from the first switching circuit 20. The control circuit 30 outputs a signal output from the first switching circuit 20. Diodes D1 to D3 that receive and prevent reverse current, diodes D1 to D3 that receive a signal output from the first switching circuit 20 and prevent reverse current, and the first switching circuit. Inverters INV1 to INV3 in which the selection signals SUB / SUB, M / M, and S / M that are output from the first switching circuit 20 are inverted in response to the signal output from 20. consist of.

Here, the resistors R8 to R13 are bias resistors through which a power supply passes.

On the other hand, the second switching means 40 which is switched by receiving the signal output from the control circuit 30 is the stereo and mono, the main audio multiple signal, the sub-audio multiple signal (S / M) of the first switching circuit 20 ), (M / M), (SUB / SUB) is selected by switching the signal output from the control circuit 30, the switch (SW1), the output of the reproduction circuit 10 is selected, It consists of (SW2), (SW3) and (SW4).

Here, the switches SW1 and SW2 are selected as signals output from the subtractor 11 and the adder 12 of the regeneration circuit 10, and the switches SW3 and SW4 are the switches SW1. , The signal passing through SW2 is selected.

In the second switching means 40 turned on by the voice multiplex signal BIL input from the outside, the transistor TR1 is connected to the output side of the inverter INV1 of the control circuit 30.

On the output side of the second switching means 40, an amplifying unit 50 that amplifies a signal passing through the switches SW3 and SW4 and outputs the L and R channels is connected. Is provided with two amplifiers AMP1 and AMP2.

In addition, the display means 60 for indicating the current selection state includes a display microcomputer 61 and a character generator for controlling the character generator by inputting a signal output from the control circuit 30 and a mono selection signal M. And a mixer 63 for mixing and outputting the signal output from the character generator 62 and the video signal V input thereto.

In the automatic reproduction circuit of the voice multiple signal configured as described above, it is assumed that the voice multiple signal of (L + R) / 2 which is the main voice multiple signal (M / M) is English, and the sub-audio multiple signal (SUB / SUB). Suppose a negative multiple signal of (LR) / 2 occurs.

That is, the voice multiplex signals of Japanese and English (LR) / 2 and (L + R) / 2 recorded on the magnetic tape are received by the subtractor 11 and adder 12 of the reproduction circuit 10. It is output as a multiple signal.

In this case, when the first switching circuit 20 is recorded in the stereo mode and the stereo and mono signals S / M which are the stereo modes are selected according to the user's preference, the diode D1 of the control circuit 30 is turned on. The output signal of the diode D1 is inverted by the inverter INV1.

On the other hand, the transistor TR1 of the second switching means 40 is turned off by the signal BIL input as a high signal when the externally recorded state is the voice multiple mode, and the high signal outputted by the display means is displayed. It is applied to the microcomputer 61 of 60 to control the microcomputer 61.

The high signal output from the inverter INV1 of the control circuit 30 includes the switches SW1 and SW2 of the second switching means 40 as the subtractor 11 and the adder 12 of the regeneration circuit 10. At the same time, the signal output from the control unit is switched to pass through, and is controlled to generate a character indicating that stereo and mono are selected by the character generator 62 by being applied to the microcomputer 61 of the display means 60, and the character generator 62 being generated. The output signal and the input video signal V are mixed by the mixer 63 and displayed on the screen.

Here, the diodes D2 and D3 of the control circuit 30 are turned off, and the high signals which are not passed by the diodes D2 and D3 are low by the inverters INV2 and INV3. Inverted by the signal, the switches SW3 and SW4 of the second switching means 40 are switched so that the signals output from the switches SW1 and SW2 are output.

The signals output from the switches SW3 and SW4 are amplified by the amplifiers AMP1 and AMP2 of the amplifier 50 and then output as L and R signals, respectively.

In such a case, when the English language (M / M) of the first switching circuit 20 is selected when the voice multiple mode is recorded, the diode D2 of the control circuit 30 is turned on, and a high signal is output from the inverter INV2. At the same time as the output, the diodes D1 and D2 are turned off, and a low signal is output from the inverters INV1 and INV3.

At this time, the transistor TR1 of the second switching means 40 is turned off to apply a low signal to the microcomputer 61 of the display means 60.

In addition, the switches SW1 and SW2 of the second switching means 40 are switched so that the voice multiple signals of the state recorded in the magnetic medium are passed through by the signals output from the inverters INV1 to INV3. The switches SW3 and SW4 are switched so that the English, which is the voice multiplex signal of (L + R) / 2, passing through the switch SW1 is passed.

Therefore, the audio multiplex signals output through the L and R channels from the amplifiers AMP1 and AMP2 of the amplifier 50 are (L + R) / 2 having an English frequency band in the video camera.

On the other hand, when the Japanese language SUB / SUB of the first switching circuit 20 is selected in the case of being recorded in the voice multiple mode, the diode D3 of the control circuit 30 is turned on, and the diodes D2 and D3 are turned on. Are turned off, so that the inverters INV1 and INV2 are output as low signals, and the inverter INV3 is output as high signals.

At this time, the transistor TR1 of the second switching means 40 is turned off and the output signal of the inverter INV1 is applied to the microcomputer 61 of the display means 60 as it is.

Then, the switches SW1 and SW2 of the second switching means 40 are (LR) / 2 in English by (L + R) / 2 according to the signals output from the inverters INV1 to INV3. The Japanese multiplexed audio signal is switched to pass, and the switches SW3 and SW4 are switched so that the Japanese multiplexed signal, LR / 2, of the signals output from the switches SW1 and SW2 is passed.

The output signal is output to the L and R channels amplified by the amplifier 50.

However, when the audio is recorded in the multiplexed mode and the stereo S / M of the first switching circuit 20 is selected, the diode D1 of the control circuit 30 is turned on, and the diodes D2 and D3 are It is turned off, and the output signal of the inverter INV1 becomes a high signal, and the inverters INV2 and INV3 are output as low signals.

At this time, a high signal is input to the transistor TR1 of the second switching means 40 and turned on, so that the high signal output from the inverter INV1 of the control circuit 30 is output as a low signal.

Therefore, the inverted low signal output from the inverter INV1 is (L + R) / 2, (LR) / 2 applied to and applied to the switches SW1 and SW2 of the second switching means 40. The English and Japanese voice multiple signals are switched to pass and the signals output from the inverters INV2 and INV3 of the control circuit 30 are transferred to the switches SW3 and SW4 of the second switching means 40, respectively. The signals that are applied and passed through the switches SW1 and SW2 are switched to each pass.

The signals output from the switches SW3 and SW4 are amplified by the amplifier 50 and then output to the L and R channels.

In this case, a signal output from the inverters INV1 to INV3 and a signal input as a high signal when the mono mode is selected are applied to the microcomputer 61 of the display unit 60 to display the character generator 62 on the screen. The stereo character is generated to be generated, and the character signal output from the character generator 62 is mixed by the input video signal V and the mixer unit 63 and then output.

On the other hand, when recorded in the stereo mode, the English (M / M), Japanese (SUB / SUB) of the first switching circuit 20 is selected as in the conventional operation.

As described above, the present invention provides a video camera in which a main voice multiple signal and a sub voice multiple signal are recorded in a stereo mode and a voice multiple mode, in which a stereo mode is recorded and stereo is selected according to a user's preference (L +). The main audio multiple signal of R) / 2, (LR) / 2 and the sub audio multiple signal are separated into L and R audio signals and output, recorded in the voice multiple mode, and the main audio multiple signal or When the sub audio multiple signal is selected, the main audio multiple signal of (L + R) / 2 or the sub audio multiple signal of (LR) / 2, which is in the recorded state, is output so that the output depends on the recorded mode and the selected mode during playback. It is automatically switched, and the selected state of the user is displayed on the screen, so that the existing main audio multiple signal and the sub audio multiple signal which are mixed and output are separated and output. There is an effect that can help in the cultivation of skills.

Claims (2)

The audio multiplexing signal inputted through the L and R channels is modulated, and the audio multiplexing signal recorded by the audio multiplexing signal and the audio multiplexing signal recorded by the audio processing circuit are mixed according to the set voice mode and stereo mode. A voice multiple circuit comprising a reproduction circuit which is reproduced and reproduced, wherein the main voice multiple signal (M / M), the sub audio multiple signal (SUB / SUB), stereo and mono (S / M) are selected according to a user's preference. A control circuit for outputting a control signal for selecting an output from the reproducing circuit 10 based on a first switching circuit 20, an output signal of the recorded mode input and a selection signal of the first switching circuit 20 ( 30 and a second switching means 40 which is automatically switched to receive the control circuit 30 signal and pass the output of the regeneration circuit 10, and is output through the second switching means 40. Voice multiple signal And an amplifying unit (50) output through the L and R channels to be amplified, and a display unit (60) displaying a state output through the L and R channels on the screen. 2. The transistor of claim 1, wherein the second switching means (40) is a transistor (TR1) that is always operated by receiving a high signal when the signal (BIL) indicating the recorded mode is a voice multiple mode, and the transistor (TR1). The switch SW1 is switched so that the signal separated by the subtractor 11 and the adder 12 of the reproduction circuit 10 or the signal in the recorded state is passed according to the signal output from the control circuit 30 and the signal output from the control circuit 30. ), (SW2) and only one of the signals passed through the switches (SW1) and (SW2) is selected and output according to the signals output from the control circuit 30, or from the switches (SW1), (SW2) An automatic reproduction circuit for an audio multiple signal comprising switches (SW3) and (SW4) which are switched to output all of the output signals.