JPH08140011A - Sound multiplex switching circuit - Google Patents

Abstract

PURPOSE: To easily and surely perform sound reproduction and recording and to improve operation by making the relation of the changeover instruction of main sound and auxiliary sound in a dual broadcasting mode and the output on a left side or on a right side be easily clarified. CONSTITUTION: By an instruction (a) or the instruction (b,) only main sound signals or auxiliary sound signals are selected in a sound multiplex changeover switch 12 and recorded in a HiFi VTR 13 and only the main sound signals or the auxiliary sound signals are sent out through a monitor/reproduction changeover switch 14, a sound output changeover switch 15 and a sound signal control circuit 16 at the time of the reproduction. By the instruction (c) or the instruction (d,) the main sound signals and the auxiliary sound signals are selected in the sound multiplex changeover switch 12 and respectively recorded in the HiFi VTR 13 and either the main sound signals or the auxiliary sound signals only are sent out through the monitor/ reproduction changeover switch 14, the sound output changeover switch 15 and the sound signal control circuit 16 at the time of the reproduction. For the cyclically performed respective instruction (a) to the instruction (d,) the main sound and the auxiliary sound in the output on the left side and on the right side are selected and clarified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a multiplex broadcast receiver having a built-in recording device, and clearly shows the relationship between a main audio signal or sub audio signal selection switching instruction and its left and right outputs. The present invention relates to an audio multiplex switching circuit for playing and recording in a dual broadcast mode.

[0002]

2. Description of the Related Art A multiplex broadcasting receiver incorporating a recent recording device, for example, an audio multiplex TV receiver with a built-in HiFiVTR, a radio cassette tape recorder capable of recording in a dual broadcasting mode (main audio, sub audio), A disc recording / reproducing device receives a dual broadcast mode wave, and performs recording (recording) and reproduction thereof. This dual-broadcast wave is generated by modulating the main audio of the native language into the baseband of the carrier and the subaudio of the foreign language and commentary into the subcarrier on the transmitting side. I am sending. Below, HiFi
An audio multiplex TV receiver with a built-in VTR will be described as an example.

FIG. 3 is a block diagram showing the configuration of a voice multiplex switching circuit in a conventional voice multiplex TV receiver. FIG.
, The audio multiplex signal demodulation circuit 1 outputs the audio multiplex signal (M
Microcomputer (MP) which demodulates a main audio signal and a sub audio signal from PX) and inputs a switching instruction signal of a user instruction to one or both of the main audio signal and the sub audio signal.
Under the control of U) 2, the audio output changeover switch 2 selects and outputs.

FIG. 4 is a diagram showing a selection state of the main audio and the sub audio in the dual broadcast mode in the audio multiplex TV receiver in accordance with a user instruction. In this selection in FIG. 4, as the left and right output signals, the main voice is selected by the user's instruction (1) and the sub-voice is selected by the instruction (2). Further, the main voice and the sub voice are selected by the instruction (3), and the instruction (1) to the instruction (3) are cyclically selected.

FIG. 5 shows a voice multiplexing T with a built-in HiFi VTR.
It is a block diagram showing a configuration of an audio multiplex switching circuit in a V receiver. In FIG. 5, the audio multiplex signal demodulation circuit 4 demodulates the main audio signal and the sub audio signal from the audio multiplex signal (MPX), and in the HiFiVTR 5, the main audio signal is recorded on one of the two tracks on the left side and the right side of the video tape. (Record), and the sub audio signal is recorded on the other side. That is, the main audio signal and the sub audio signal are simultaneously recorded on the video tape. The main voice signal demodulated by the voice multiple signal demodulation circuit 4,
The sub audio signal is input to the audio output changeover switch 7 through the monitor / playback changeover switch 6.

The two switches in the monitor / playback changeover switch 6 and the audio output changeover switch 7 are
MPU8 to which switching instruction signal such as user instruction is input
The main audio signal and the sub audio signal from the audio multiplexed signal demodulation circuit 4 or the main audio signal and the sub audio signal reproduced by the HiFiVTR 5 are selected and transmitted as the left and right output signals.

When reproducing the double broadcast recorded by the HiFiVTR 5, two switches in the monitor / reproduction changeover switch 6 are switched to output the left (L) output (main audio signal) and the right (R) output from the HiFiVTR 5. Sub audio signal). Moreover, the two switches in the output changeover switch 7 are selected by the control of the MPU 8 to which a changeover instruction signal such as a user instruction is inputted, and the user outputs the desired left (L) output (main audio signal) or right (R). Listen to the output (sub audio signal).

In this case, in recording in the HiFiVTR 5, the main audio signal is recorded on one of the two tracks on the left side or the right side of the video tape, and the sub audio signal is recorded on the other. That is, the recording is performed as it is without identifying the recording in the dual broadcast mode. Then, the MPU 8 forcibly outputs the left side and the right side simultaneously at the time of reproduction, and performs mode initialization control. Therefore, when the user wants to hear only the sub-audio during reproduction, it is necessary to instruct the switching of the output selector switch 7 each time.

Further, when it is not detected which track the sub-audio is recorded on and the switching instruction of the output selector switch 7 is issued during reproduction, only the selection is left output or right output. Is displayed on the display. In other words, if the selection is left-sided output, the user will not know whether the output is the main voice or the sub-voice.

[0010]

As described above, in the above-described audio multiplex switching circuit of the prior art, the HiFiVTR 5 does not identify the recording in the dual broadcast mode, and outputs the left side and the right side at the same time when the reproduction is started. For example, if the user wants to hear only the sub-voice, a switching instruction is required each time. Further, when the left output is selected, it is not known whether the output is the main voice or the sub voice.

The present invention solves the above-mentioned drawbacks of the prior art. In a voice multiplex receiver capable of recording, a main voice or sub voice switching instruction in a dual broadcast mode and its left side. It is an object of the present invention to provide an audio multiplex switching circuit in which the relationship between the output and the output on the right side can be easily found, reproduction and recording can be performed easily and surely, and the operability is improved.

[0012]

To achieve the above object, the invention according to claim 1 is a multiplex broadcast receiving means for receiving a multiplex audio broadcast and outputting one or a plurality of demodulated signals, When the recording / reproducing means for recording and reproducing the demodulated signal from the multiplex broadcast receiving means on a plurality of recording tracks is provided, the demodulated signal recorded and reproduced by the recording / reproducing means is selectively selected. In a voice multiplex switching circuit for switching to output, one demodulated signal reproduced by the recording / reproducing means is transmitted, or one output of a plurality of demodulated signals reproduced is stopped, and the other A structure comprising audio signal transmitting means for outputting a demodulated signal, instruction control means for instructing switching by the switching means and selection of output by the audio signal transmitting means, and controlling this instruction As .

In the audio multiplex switching circuit according to the second aspect of the present invention, the audio multiplex broadcast is a dual broadcast consisting of main audio and sub-audio, and the multiplex broadcast receiving means demodulates the main audio signal and the sub-audio signal, and The switching means sends one or both of the main audio signal and the sub audio signal, and the audio signal sending means sends the main audio signal or the sub audio signal reproduced by the recording / reproducing means, or the reproduced main audio signal. One of the sub audio signals is output, and the instruction control means controls the output instruction.

According to a third aspect of the present invention, in the audio multiplex switching circuit, a volume balance control circuit provided in the multiplex broadcast receiving means is used as the audio signal transmitting means.

According to a fourth aspect of the present invention, as the recording / reproducing means according to the first aspect, a device for recording a main voice and a sub voice on two recording tracks of a recording medium is used.

[0016]

The audio multiplex switching circuit having the above-mentioned structure demodulates the received multiple broadcast signal, for example, the main audio signal and the sub audio signal in the dual broadcast, and one or a plurality of them. The main audio signal and the sub audio signal as signals are selected by the switching means and recorded by the recording means. For example, it is recorded by a high-fidelity video tape recorder or a stereo tape recorder, a disk recording / reproducing device, and the like.
Then, the main audio signal or the sub audio signal which is one demodulated signal to be reproduced from this is transmitted, or the main audio signal or the sub audio signal which is one of the plurality of demodulated signals to be reproduced is output. , For example, by controlling a volume balance control circuit provided in the multiplex broadcast receiving means.

Therefore, in the audio multiplex receiver capable of recording, the relationship between the main audio or subaudio switching instruction in the dual broadcast mode in multiplex broadcasting and the outputs on the left and right sides thereof can be easily found. , Its playback and recording can be done easily and surely, and its operability is improved.

In this case, if one of the desired main audio or sub audio modes in the dual broadcast is instructed, the instructed main audio or sub audio is recorded. When the selection is left output, it is not unclear whether the output is the main audio mode or the sub audio mode. That is, there is no need for the user to remember the recording state. Further, even if one of the desired main voice and sub-voice is heard, both main voice and sub-voice are recorded, so that both the main voice and the sub-voice can be reproduced thereafter. Further, when the left and right outputs are only one of the main voice and the sub voice, it is also found that both the main voice and the sub voice are recorded.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a voice multiplex switching circuit of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of a voice multiplex switching circuit of the present invention. In FIG. 1, this voice multiplex switching circuit is a HiFiVTR.
It is provided in a built-in audio multiplex TV receiver, and outputs from the audio multiplex signal demodulation circuit 11 and an audio multiplex signal demodulation circuit 11 which outputs a main audio signal and a sub audio signal obtained by demodulating the audio multiplex signal. An audio multiplex switch 12 for selecting one or both of the main audio signal and the sub audio signal, and the main audio signal is recorded (recorded) on one of the two tracks on the left side or the right side of the video tape, and the sub audio is recorded on the other side. A HiFi VTR 13 for recording signals is provided.

Further, the monitor / reproduction selector switch 1 for selecting the output from the audio multiplex selector switch 12 or the main audio signal and the sub audio signal reproduced by the HiFi VTR 13.
4, a main audio signal and a sub audio signal from the monitor / playback changeover switch 14, which are output as left and right side output signals, and a left side and a right side input from the voice output changeover switch 15. An audio signal control circuit 16 having two variable amplifiers for controlling the volume of an output signal (main audio signal, sub audio signal), and a control signal from the audio multiplex changeover switch 12 to the audio signal control circuit 16. A microcomputer (MPU) 17 for controlling selection switching is provided.

The audio signal control circuit 16 may be constructed by using a volume balance control circuit (not shown) in the audio multiplex TV receiver. Further, the audio signal control circuit 16 may be configured by a switch that sets the left and right output signals (main audio signal and sub audio signal) to pass / non-pass under the control of the MPU 17, instead of the variable amplifier.

The voice multiplex changeover switch 12, the monitor / playback changeover switch 14, and the voice output changeover switch 15 are switches (SW) 12a and 12b and a switch (S), respectively.
W) 14a, 14b and switches (SW) 15a, 15
b, the movable contact of each switch is individually switched to the direction A or the direction B shown in the figure under the control of the MPU 17.

Next, the operation of this embodiment will be described. In FIG. 1, H equipped with the audio multiplex switching circuit
The audio multiplex TV receiver with built-in iFiVTR performs reception in the dual broadcast mode, and the received signal, for example, the intermediate frequency band signal is input to the audio multiplex signal demodulation circuit 11, and the main audio signal and the sub audio which are demodulated therein are received. Output a signal. The main audio signal and the sub audio signal are supplied to the fixed contacts of the SWs 12a and 12b in the audio multiplex switch 12, respectively. After that, an instruction to output the desired main audio signal and sub audio signal is given.

In response to this instruction, the user operates a mode changeover switch (not shown) in the HiFiVTR built-in audio multiplex TV receiver equipped with the audio multiplex switching circuit,
At the same time, the playback operation of the HiFiVTR 13 is performed. The MPU 17 takes in this operation signal and controls to switch the voice output changeover switch 15 from the voice multiplex changeover switch 12 as described in detail below.

FIG. 2 is a diagram showing a selection state of the main audio and the sub audio in the dual broadcast mode. 1 and 2
In the selection of the main voice and the sub voice, the instruction a to the instruction d shown in FIG. 2 are cyclically performed, and only the main voice is output in the instruction a. In the instruction b, only the sub voice is output, and in the instruction c, only the main voice is output from the left side.
Further, in the instruction d, only the sub voice is output from the right side.

First, in the instruction a, the control signal Ca from the MPU 17 causes the voice multiplex switch 12 to switch SW12a,
The drive for switching the movable contact 12b to the direction B is performed to output the main audio signal to both the left and right outputs. Therefore, the main audio signal is supplied to both the left and right inputs of the HiFi VTR 13, and the main audio signal is recorded on the left and right two tracks of the video tape.

The main audio signal from the audio multiplex changeover switch 12 or the main audio signal when the HiFi VTR 13 is reproduced is the SW 14 in the monitor / reproduction changeover switch 14.
It is supplied to the fixed contact of each of a and 14b, and MPU1
A control signal Cb from the switch 7 switches the movable contacts of the SWs 14a and 14b to the direction A or the direction B. From these two movable contacts, the sound multiplex switch 12 or Hi.
The main audio signal from the FiVTR 13 is sent to the fixed contacts of the SW 15a and 15b of the audio output changeover switch 15.

At the same time, the SW of the audio output selector switch 15
The movable contact of 15a is switched to the direction B by the control signal Cc from the MPU 17, and the movable contact of SW15b is switched to the direction A. From here, the main audio signals are input to the audio signal control circuit 16. At this time, control signals Ce and Cf, which are instructions for outputting the main audio signal as it is or after amplifying the main audio signal, are sent to the audio signal control circuit 16 from the MPU 17, and the main audio is output as the left and right output signals. The signal is sent out. This main audio signal is output through an amplifier, a speaker, etc. not shown.

In the next instruction b, SW1 in the audio multiplex switch 12 is controlled by the control signal Ca from the MPU 17.
The drive for switching the movable contacts 2a and 12b to the direction A is performed to output the sub audio signal to both the left and right outputs.
Thereafter, the sub-audio signal is sent from the audio signal control circuit 16 in the same manner as the instruction a.

In the next instructions c and d, the MPU 1
A voice multiplex changeover switch 1 by a control signal Ca from 7
2 switches the movable contact of SW12a in the direction B,
The drive for switching the movable contact of the SW 12b to the direction A is performed to supply the main audio signal and the sub audio signal to the left and right inputs of the HiFi VTR 13 so that the main audio and the sub audio are respectively supplied to the two tracks on the left and right sides of the video tape. Record voice.

In the case of the instruction c, the switches 14a and 14b of the monitor / reproduction changeover switch 14 are switched to the direction A, and
The SW 15a and 15b of the audio output changeover switch 15 are switched to the direction B and the direction A to supply the main audio signal and the sub audio signal to the audio signal control circuit 16, respectively, and only the main audio signal is output from the variable amplifier by the control signal Cf. In addition, the control signal Ce stops the transmission of the sub audio signal from the variable amplifier. In the case of the instruction d, conversely, the transmission of the main audio signal which is the left output from the audio signal control circuit 16 is stopped and only the sub audio signal which is the right output is transmitted.

By cyclically selecting the instruction a to the instruction d as shown in FIG.
When recording on the VTR 13, if one of the desired main audio mode or sub audio mode in the dual broadcast mode is instructed, the instructed main audio or sub audio is recorded. As described above, when the selection is the left output, it is not unknown whether this output is the main audio mode or the sub audio mode. Therefore, there is no need for the user to remember the recording state.

While listening to one of the desired main voice and sub-voice, both the main voice signal and the sub-voice signal are HiFiV.
If you want to record in TR13, HiFiVTR13
Instruct to record in, and play back after this to listen to the main and sub voices. When the left and right outputs are only one of the main voice and the sub voice, as in the case of the instructions c and d,
It is also known in advance that both the main audio signal and the sub audio signal are recorded by the HiFi VTR 13.

In addition to the cyclic selection from the instruction a to the instruction d shown in FIG.
Selection switching in the audio signal control circuit 16 (direction A,
By changing the combination of B), it is possible to select various output methods such as inverting the left and right outputs of the main voice and the sub voice.

[0035]

As is apparent from the above description, according to the audio multiplex switching circuit of the first to fourth aspects, the received multiplex broadcast signal is demodulated, and one or a plurality of demodulated signals are simultaneously converted by the switching means. Since it is selected and recorded by the recording means, and further, one demodulation signal to be reproduced here is transmitted or one of a plurality of demodulation signals to be reproduced is controlled,
In a sound multiplex receiver capable of recording, for example, in the sound multiplex, the relationship between the main audio or sub audio switching instruction and the outputs on the left side and the right side in the dual broadcast mode can be easily found and reproduced. The effect is that recording can be performed easily and surely and the operability is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a voice multiplex switching circuit of the present invention.

FIG. 2 is a diagram showing a selection state of a main voice and a sub voice according to a user instruction in the embodiment.

FIG. 3 is a block diagram showing a configuration of an audio multiplex switching circuit in a conventional audio multiplex TV receiver.

FIG. 4 is a diagram showing a selection state of main audio and sub audio according to a user instruction in a dual broadcast mode in a conventional audio multiplex TV receiver.

FIG. 5 is a block diagram showing a configuration of an audio multiplex switching circuit in a conventional audio multiplex TV receiver with built-in HiFiVTR.

[Explanation of symbols]

 11 audio multiplex signal demodulation circuit 12 audio multiplex selector switch 13 HiFiVTR 14 monitor / playback selector switch 15 audio output selector switch 16 audio signal control circuit 17 MPU

Claims (4)

[Claims] 1. A multiplex broadcast receiving means for receiving a multiplex audio broadcast and outputting one or a plurality of demodulated signals, and recording and reproducing the demodulated signals from the multiplex broadcast receiving means on a plurality of recording tracks. A voice multiplex switching circuit for switching the recording of the demodulated signal by the recording / reproducing means and selectively outputting the reproduced demodulated signal when the recording / reproducing means is provided. Switching means for selecting one demodulated signal or a plurality of demodulated signals from and sending it to the recording / reproducing means, and sending one demodulated signal reproduced by the recording / reproducing means,
Or, stop the output of one of the multiple demodulated signals to be reproduced,
And an audio signal transmitting means for outputting the other demodulated signal, an instruction control means for instructing switching by the switching means and selection of output by the audio signal transmitting means, and controlling this instruction. And a voice multiplex switching circuit comprising: 2. The audio multiplex broadcast is a dual broadcast consisting of main audio and sub-audio, the multiplex broadcast receiving means demodulates the main audio signal and the sub-audio signal, and the switching means is the main audio signal and the sub-audio. One or both of the signals is transmitted, and the audio signal transmitting means transmits the main audio signal or the sub audio signal reproduced by the recording / reproducing means, or the reproduced main audio signal,
2. The audio multiplex switching circuit according to claim 1, wherein one of the sub audio signals is output, and the instruction control means controls the output instruction. 3. The audio multiplex switching circuit according to claim 1, wherein a volume balance control circuit provided in a multiplex broadcast receiving means is used as the audio signal transmitting means. 4. The audio multiplex switching circuit according to claim 2, wherein a device for recording a main voice and a sub voice on two recording tracks of a recording medium is used as the recording / reproducing means.