JPS6210975A - Sound multiplex signal control circuit - Google Patents

Abstract

PURPOSE:To make control of the selection of simultaneous main and auxiliary mode by connecting between a stereo/monoral mode (ST/MO) switching control signal input terminal and a main/auxiliary mode switching signal input terminal with between the ST/MO switching control signal input terminal and the main/ auxiliary mode switching control signal input terminal by diodes. CONSTITUTION:When the stereo/monoral switching control signal input terminal 4 is made to low level that selects a monoral mode, the main/auxiliary mode switching control signal input terminal 5 is also changed forcibly to low level by a diode 3 and becomes a mode in which only main sound is outputted from an output terminal 1. On the other hand, the main/auxiliary mode selection control signal input terminal 6 is made forcibly to low level, and a terminal 9 is made to high level by an inversion amplifier 7, a switch 11 is closed, and the signals of the terminal 1, that is, only main sound, is reproduced from loudspeakers 14, 15. Thus, changing from a simultaneous main/auxiliary mode to a main sound mode can by made by one operation by a remote control.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control circuit for audio multiplexed signals used in television receivers and the like.

BACKGROUND OF THE INVENTION In recent years, audio multiplex broadcasting has been widely used in TV Jihoon broadcasting and the like. Along with this, many circuits have been considered to control audio multiplexed signals.
An example of a conventional audio multiplex signal control circuit will be explained. FIG. 2 shows the configuration of a conventional audio multiplex signal control circuit.

In FIG. 2, 1 is a tuner, 2 is a detector, 3 is an audio multiplex signal processing circuit, 4 is an input terminal for a stereo/monaural mode switching control signal, 5 is an input terminal for a main/sub mode switching control signal, and 6 is an input terminal for a main/sub mode switching control signal. 7 is an inverting amplifier; 8 is an input terminal for a switching control signal of the switch 10; and 9 is an input terminal for a switching control signal of the switch 11.

Regarding the audio multiplex signal control circuit configured as above,
The operation will be explained below. First, tuner 1,
The received audio signal input to the audio multiplex signal processing circuit 3 via the wave detector 2 is processed and switched, and then the output audio is determined and output to the left and right speakers.

If the received signal is a stereo signal, connect the stereo/
If the monaural mode switching control signal is at a low level, output terminals 1 (L, R) and output terminals 2 (L').

)1/), and if the stereo/monaural mode switching control signal is at a high level, output terminal 1 is output.
(L, R) and output terminal 2 (L', R).

Next, if the received signal is an audio multiplex signal, if the main/sub mode switching control signal at terminal 5 is at a low level, output terminal 1 (L
, R), the main audio signal is output to output terminal 2 (L
', A sub-audio signal is output to R'. Conversely, if the main/sub switching control signal is at a high level, the sub audio signal is output to the output terminals 1 (L, R), and the main audio signal is output to the output terminals 2 (L', R). At this time, since the switch 11 is normally closed, only either the main audio or the sub audio is reproduced from both speakers.

Switches 10 and 11 are closed when the switching control signals to terminals 8 and 9, respectively, are at a high level.

Using this, when the main/sub simultaneous mode selection control signal at terminal 6 is set to a high level while an audio multiplexed signal is being received, switch 11 opens and switch 1° closes, causing the sound to be output from one of the two speakers. When the main audio is played from the other side, the sub audio is simultaneously played.

Problems to be Solved by the Invention However, in television sets that receive such audio multiplexed signals, there is no mode control signal switch for main/sub simultaneous selection on the remote control transmitting side, but on the television set side. It is provided only in Therefore, when the speaker output is in the main audio and sub audio simultaneous mode, if the radio wave reception condition temporarily deteriorates and the audio becomes distorted, it is desirable to return to the main audio.
To do this, first press button 6 on the television set side.
・ .

It is necessary to change the main/sub simultaneous selection mode control signal from a high level to a low level by the remote controller, and then change the main/sub mode switching control signal to a low level on the remote control side.

This operation requires switching the button on the television center each time, and there is a problem in that it is not easy to operate for the viewer.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide an audio multiplex signal control circuit that has a simple configuration and is capable of controlling the selection of the main and sub simultaneous modes on the remote control transmitting side.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a connection between the stereo/monaural mode switching control signal input terminal and the main/sub mode switching control signal input terminal, and between the stereo/monaural mode switching control signal input terminal and the stereo/monaural mode switching control signal input terminal. A diode is used to connect the control signal input terminal and the main/sub simultaneous mode selection switching control signal input terminal.

For production The present invention uses the above-described configuration to generate an audio multiplex signal 68.

If you set the stereo/monaural mode switching control signal input terminal to a low level (selecting monaural mode) while receiving all signals, the diode will force the main/sub mode switching control signal input terminal and the main/sub simultaneous By setting the mode selection switching control signal input terminal to a low level, a mode can be set in which only the main audio is always output from the speaker.

Embodiment FIG. 1 is a block diagram showing an embodiment of the audio multiplex signal control circuit of the present invention. In FIG. 1, a tuner 1, a detector 2, an audio multiplex signal processing circuit 3, a stereo/monaural mode switching control signal input terminal 4, a main/sub mode switching control signal input terminal 5, a main 1N11 simultaneous mode selection control signal input terminal 6 , the inverter 7.7, the switches 10 and 11, and the control terminals 8 and 9 are the same as those shown in FIG.

Furthermore, 12 and 13 are diodes newly added in this embodiment, and the diode 12 has its cathode on the stereo/monaural switching mode switching control signal input terminal 4 side, and is connected between the main and sub simultaneous mode selection signal input terminal 6. The diode 13 is also inserted between the main/sub switching terminal 5 with its cathode facing the stereo/monaural mode switching terminal 4.

Next, the operation of the embodiment will be explained using FIG.

Now, consider the case where the main/sub simultaneous mode selection control signal input terminal 6 is set to a high level. At this time, normally, terminal 8 is at high level and terminal 9 is at low level, and switch 1o is closed, so as a result, main audio and sub audio are output from left and right speakers 14 and 15, respectively. be done. However, in this circuit, when the stereo/monaural mode switching control signal input terminal 4 is set to a low level to select the monaural mode, the main/sub mode switching control signal input terminal 6 is also forced to a low level by the diode 13. Thus, the mode is set in which only the main audio is output from the output terminals 1 (L, R). On the other hand, the diode 12 forces the main/sub simultaneous mode selection control signal input terminal 6 to a low level, and the inverting amplifier 7 forces the terminal 9 to a high level. Therefore, the switch 11 is closed, and as a result, only the signals of the output terminals 1 (L, R), that is, the main audio, are reproduced from both the left and right speakers 14 and 16. As described above, even when the main and sub simultaneous mode is selected on the television receiver body, it is possible to switch to the main audio mode by remote control.

Next, consider a case where the main/sub simultaneous mode selection control signal input terminal 6 is set to a low level. At this time, normally, the terminal 9 is set to a high level by the inverting amplifier 7, the switch 11 is closed, and the signals of the output terminals 1 (L, R) are output from the left and right speakers 14, 15. That is, if the main/sub mode switching control signal input terminal 6 is at a low level, only the main audio is output, and if it is at a high level, only the sub audio is output.

Now, with the main/sub mode switching control signal input terminal 5 set to high level and sub audio being output from both the left and right speakers 14°9 and -715, stereo/monaural can be switched by remote control. When the mode switching control signal input terminal 4 is set to a low level indicating monaural mode, the diode 13 forces the main/sub mode switching control signal terminal 5 to also be set to a low level. As a result, the output from the output terminals 1 (L, R) becomes the main audio mode, and the left and right speakers 14. ．． From 15, only the main audio is output.

As described above, even when the television receiver is switched to the sub-audio mode, by setting the stereo/monaural mode switching control signal input terminal 4 to the low level that selects the monaural mode using the remote control, the remote control You can switch to the main audio mode by pressing .

Effects of the Invention As described above, according to the present invention, when receiving an audio multiplex signal, switching to the main audio mode is possible by switching the stereo/monaural mode switching control signal input terminal to a state where the monaural mode is selected. In particular, when switching from the main/sub simultaneous mode to the main audio mode, the switching can be done with a single operation using the remote control, which is extremely useful in practice.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an audio multiplex signal control circuit according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional audio multiplex signal control circuit. 3...Audio multiplex signal processing circuit, 4...
Stereo/monaural mode switching control signal input terminal, 6.
...Main/sub mode switching control signal input terminal, 6...
...Main and sub simultaneous mode selection control signal input terminal, 10.1
1...Switch, 12.13...Diode.

Claims (1)

[Claims] It has a stereo/monaural mode switching control signal input terminal and a main/sub mode switching control signal input terminal that independently control switching between stereo mode and monaural mode, and between main audio mode and sub audio mode, and according to the control signal. 1st
an audio multiplex signal processing circuit that selectively outputs audio signals to the left and right output terminals and a second left and right output terminal, and switches the audio multiplex signal reception signal to output both the main audio and sub audio to the left and right speakers. a switch circuit having a main/sub simultaneous mode selection control signal input terminal and switching the connection between the two left and right output terminals and the speaker according to the control signal; An audio multiplex signal control circuit comprising: a diode connected between a main/sub mode switching control signal input terminal and a main/sub simultaneous mode selection control signal input terminal.