KR950010545Y1 - A.v selecting circuit of t.v.c.r - Google Patents

Abstract

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Description

AV selection circuit of mono stereo TVCR

1 is a circuit diagram of an AV selection circuit of a mono, stereo TVCR of the present invention.

* Explanation of symbols for main parts of the drawings

2: Mono, stereo TVCR AV selection circuit 3: Input terminal

4: input selection integrated circuit

8: Voice multiple and stereo broadcast selection integrated circuit

10: audio recording and playback circuit 12: mixer

14 amplifier 16 output integrated circuit

18: output terminal

The present invention relates to a circuit that makes it possible to record a voice signal by converting it to a mono sound method when recording by connecting a TV and a VTR having a different voice transmission method.

Specifically, the present invention is the audio transmission method of the audio multiplexing method and the stereo system, and even if the VTR is the mono system audio system, the audio recording of the audio signal is also recorded in the mono system VTR by switching the audio multiplexing signal and the stereo signal appropriately. A circuit is made possible.

Recently developed TVs have a voice transmission system of multiple voices and stereo systems, whereas VTRs have a mono voice transmission system. In this case, when recording the broadcast received from the TV with the VTR, the method of processing the audio signal is different from that of the TV and the VTR. For example, if you are receiving an audio multiple broadcast on the TV, that is, English and Korean at the same time, if you record the audio multiple broadcast received on the TV with the mono VTR, it will be recorded in English and Korean. When playing the videotape, there was a problem in that the recorded audio recording contents could not be recognized. In addition, when receiving a stereo broadcast on the TV was a disadvantage that can not record the stereo broadcast received on the TV with the mono VTR.

In order to solve the above problems, the present invention outputs an audio amplification circuit as the audio signals (L) and (R) when watching TV only, and receives the TV when recording the broadcast received on the TV with VTR. If the broadcast is a voice multicast, only the (main) signal (or the L channel signal) is output to the audio recording and reproducing circuit.In the case of a stereo broadcast, the (L) and (R) channels are synthesized to produce a mono signal. The present invention provides an AV selection circuit which outputs to a reproduction circuit and outputs a signal reproduced by the audio recording and reproduction circuit as it is during reproduction.

The mono and stereo TVCR selection circuit of the present invention selects and outputs (RF, AV1, AV2) signals input through the input terminal 3 from the TV according to the selection of the (TV / AV selection) and (AV1 / AV2 selection) terminals. Input selection integrated circuit (4) for transmitting a specific signal selected to the integrated circuit (16) or voice multiple and stereo broadcast selection integrated circuit (8), (Main) terminal is selected for voice multiple broadcasting, and (L, R for stereo broadcasting). Audio multiple and stereo broadcast selection integrated circuit (8), audio multiple and stereo broadcast selection integrated circuit (8) which selects a terminal and transmits an audio signal from the input selection integrated circuit (4) to the audio recording and playback circuit (10). Audio recording and reproducing circuits 10 for recording or reproducing audio signals transmitted from the < RTI ID = 0.0 > 10, < / RTI > Mixer 12, input selection integrated circuit (4) Amplifying the audio signal transmitted from the (L, R) terminal to the output integrated circuit (16) and the signal input from the amplifier (14) or the audio recording and reproducing circuit (10). It is composed of an output integrated circuit 16 for transmitting through.

Hereinafter, a mono, stereo TVCR AV selection circuit of the present invention will be described in detail with reference to FIG.

The circuit of the present invention has an input selection integrated circuit (4) having an (RF, AV1, AV2) input terminal (3), (L, R) output, (TA / AV selection, AV1 / AV2 selection) terminals, and an input terminal ( From audio multiple and stereo broadcast selection integrated circuits (8), (L, R) having L) and (L + R), having an output terminal (H) and ((L / L + R) selection terminals. A mixer 12 that adds a signal of a signal, an audio recording and reproducing circuit 10 for recording or reproducing an audio signal, and an amplifier 14 for amplifying a signal transmitted from an input selection integrated circuit 4 to an output integrated circuit 16. And an output integrated circuit 16 for transmitting the signal coming from the audio recording and reproducing circuit 10 and the signal coming from the amplifier 14 to the output terminal 18.

The operation of the present invention is as follows.

Select (RF) or (AV1) or (AV2) of the input terminal 3 as the (TV / AV selection) terminal of the input selection integrated circuit 4, and select the (AV1 / AV2) Select (AV1) or (AV2). The audio signal which enters the input terminal 3 and goes out to the terminals L and R of the input selection integrated circuit 4 is not recorded. When watching only TV, the audio signal is passed through the amplifier 14 to the output terminal 18. Is sent to the end. In order to record the audio signal coming from the TV, the audio signal must go through the audio recording and reproducing circuit 10. However, there are two types of audio signals coming from the TV, audio signals and stereo signals. For example, if the audio multiplexing signal that is broadcast in English and Korean is recorded in VTR, which is a mono type, English and Korean are mixed and recorded, and thus, even when played back, it cannot be heard. Therefore, since VTR is mono, only one of the (L) and (R) channels of the input selection integrated circuit 4 should be selected for recording. In the case of voice multiple broadcasting, the (L / L + R) terminal of the voice multiplexing and stereo broadcasting selecting integrated circuit 8 is set to a high state, and the main terminal of the terminal L side is selected to select the input selecting integrated circuit 4. (L) The channel signal should be sent to the audio recording and reproducing circuit 10 for recording. If the audio signal coming from the TV is a stereo signal, the (L) and (R) channel signals of the input selection integrated circuit 4 may be added and recorded. Therefore, in the case of a stereo signal, the L + R signal added to the mixer 12 through the (L / L + R selection) terminal of the audio multiplex and stereo broadcast selection integrated circuit 8 to the audio recording and reproducing circuit 10. Have them write down. In reproduction, the signal from the audio recording and reproducing circuit 10 is output to the output terminal 18 by adjusting the reproducing / TV viewing terminal of the output integrated circuit 16.

The circuit of the present invention has the effect of making it possible to record the audio multiplexed audio signal and the stereo signal of the broadcast received in the multiplexed stereo and stereo TV as a mono type VTR.

Although only detailed embodiments of the present invention have been described in detail, it will be apparent to those skilled in the art that various changes and modifications can be made within the spirit and scope of the present invention, and such variations and modifications are within the scope of the appended utility model claims. Do.

Claims (2)

According to the selection of the (TV / AV selection), (AV1 / AV2 selection) terminal, the (RF, AV1, AV2) signal input from the TV through the input terminal (3) is selected, Input selection integrated circuit (4) for transmitting a specific signal selected to the stereo broadcast selection integrated circuit (8), (Main) terminal for voice multiple broadcasting, and (L, R) of the input selection integrated circuit (4) for stereo broadcasting. Audio multiple and stereo broadcast selection integrated circuit (8), audio multiple and stereo broadcast selection integrated circuit (8) for selecting terminals and transmitting audio signals from the input selection integrated circuit (4) to the audio recording and playback circuit (10). Audio recording and reproducing circuit 10 for recording or reproducing an audio signal transmitted from the audio multiplexing and stereo broadcasting selecting integrated circuit 8 when (L / L + R selection) of the audio multiplexing and stereo broadcasting selecting integrated circuit 8 is performed. Amplifier by adding the audio signal from the (L + R) terminal A mixer 12 for transmitting to (14), an amplifier 14 and an amplifier 14 for amplifying an audio signal transmitted from the (L, R) terminals of the input selection integrated circuit 4 to the output integrated circuit 16, or And an output integrated circuit (16) for transmitting a signal from the audio recording and reproducing circuit (10) through the output terminal (18). The audio multiple and stereo signal according to claim 1, wherein when a high level voltage is applied to the (L / L + R selection) terminal of the audio multiple and stereo broadcast selection integrated circuit 8, only the signal of the (main) terminal is used. Is transmitted to the audio recording and reproducing circuit 10 through the terminal H of the broadcast selection integrated circuit 8, and to the (L / L + R selection) terminal of the audio multiplex and stereo broadcast selection integrated circuit 8; When a low level voltage is applied, the signal at the (L, R) terminal is added by the mixer 12 to the signal of the (L + R) terminal through the terminal H of the voice multiplexing and stereo broadcast selection integrated circuit 8. Is selected to be transmitted to the audio recording and reproducing circuit (10).