JPH06165077A - Voice signal switching device - Google Patents

Abstract

PURPOSE:To output a voice in any arbitrary mode to a headphone regardless of a main channel or a sub channel of a voice signal flowing from a speaker. CONSTITUTION:Control or processing such as surround, sound volume, sound quality, balance or voice defeat, for example, is performed for the output of a first switcher 6 by a voice processing circuit 7. The output of the voice processing circuit 7 is inputted to a second switcher 10. At the second switcher 10, a required voice signal is outputted to a headphone switcher 8 and a head- phone terminal 11 by selecting the mode. At the headphone switcher 8, conventional the headphone is connected and the other headphone is connected to the headphone terminal 11. When the headphone is not connected, at the headphone switcher 8, the voice signal is bypassed and outputted to a speaker 9. When the headphone is connected, the voice signal does not flow from the speaker instead can be listened only by the headphone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal switching device for switching and outputting audio multiplex signals for bilingual broadcasting and the like.

[0002]

2. Description of the Related Art In current television broadcasting, an audio signal is FM-modulated and transmitted, but in a system for audio multiplex broadcasting, there are two transmission channels, a main channel and a sub-channel (for example, "TV Technical textbook "
See Japan Broadcasting Corporation, Japan Broadcast Publishing Association, 1989). Stereo audio, 2 audio, etc. are selected according to the program content and transmitted through two transmission channels. For example, in the case of two-audio broadcasting, it is possible to enjoy software as Western languages by switching the sound of software such as Western movies originally written in Japanese on the main channel and on the sub-channel in the original language (English etc.).

Conventional examples relating to the present invention will be described below with reference to the drawings. FIG. 4 is an example of a block diagram in which only the audio processing system of the current television receiver is extracted. 1 is an antenna, 2 is a tuner, 3 is an audio intermediate frequency detector, 4 is an FM detector, 5 is an audio multiplex demodulator, 6 is a first switching device, 7 is an audio processing circuit, 8 is a headphone switching device,
Reference numeral 9 is a speaker, 12 is an external input terminal, and 13 is an internal input terminal.

A television signal received by the antenna 1 is converted into an intermediate frequency signal by the tuner 2. Tuner 2
The output of is converted into a beat signal of 4.5 MHz by the audio intermediate frequency detector 3, and is detected by the FM detector 4 into an audio signal containing the audio multiplex signal. In addition to the main audio signal, a frequency-modulated sub-audio signal and an amplitude-modulated control signal are multiplexed in the detected signal, and demodulated into stereo audio or two audio signals by the audio multiplex demodulator 5. . Hereinafter, the audio signal will be described as plural channels (two channels) instead of monaural. The output of the audio multiplex demodulator 5 is input to the first switching device 6, switched to the signal from the external input terminal 12 or the internal input terminal 13, and output. An audio signal from an external video device such as a VTR is connected to the external input terminal 12, and an output sound of a BS tuner is connected to the internal input terminal 13 in the case of a BS (satellite broadcast) built-in television, for example.
The output of the first switch 6 is controlled and processed by the audio processing circuit 7 such as surround sound, volume, sound quality, balance, and audio defeat. A specific circuit configuration is a well-known technique, and therefore its description is omitted. The output of the voice processing circuit 7 is output to the speaker 9 by bypassing the voice signal when the headphones are not connected by the headphone switch 8. When the headphones are connected, the audio signal does not flow from the speaker and can be heard only by the headphones.

[0005]

However, in the two-audio broadcasting, the above-mentioned circuit configuration does not allow a plurality of people to simultaneously listen to the main channel sound through the speaker, the sub channel sound through the headphones, or vice versa.

As described above, in the conventional audio signal switching device, for example, one person cannot listen to the main channel sound through the speaker and another person cannot listen to the sub channel sound through the headphones at the same time.

The present invention has been made in view of the above problems, and an object thereof is to provide an audio signal switching device capable of listening to an arbitrary audio through headphones regardless of the main / sub of the audio signal flowing from the speaker. And

[0008]

In order to achieve the above object, an audio signal switching device of the present invention switches multi-channel audio signals, adjusts the volume and sound quality, and then switches to two systems. It is composed of devices that output to speakers and headphones.

[0009]

In the above structure, for example, when multi-channel sound is broadcast in two languages, the speaker can listen to the Japanese dubbing of the main channel from the speaker and separately listen to the foreign language sound of the sub-channel with the headphones. It acts so that you can listen to the sound independent of the sound of.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A television signal processing apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of an audio signal switching device according to an embodiment of the present invention. 1 is an antenna, 2 is a tuner, 3 is an audio intermediate frequency detector, 4 is an FM detector, 5 is an audio multiplex demodulator, 6 is a first switching device, 7 is an audio processing circuit, 8
Is a headphone switcher, 9 is a speaker, 10 is a second switcher, 11 is a headphone terminal, 12 is an external input terminal, 13
Is an internal input terminal.

The television signal received by the antenna 1 is converted into an intermediate frequency signal by the tuner 2. Tuner 2
The output of is converted into a beat signal of 4.5 MHz by the audio intermediate frequency detector 3, and is detected by the FM detector 4 into an audio signal containing the audio multiplex signal. In addition to the main audio signal, a frequency-modulated sub-audio signal and an amplitude-modulated control signal are multiplexed in the detected signal, and demodulated into stereo audio or two audio signals by the audio multiplex demodulator 5. . Hereinafter, the audio signal will be described as plural channels (two channels) instead of monaural. The output of the audio multiplex demodulator 5 is input to the first switching device 6, switched to the signal from the external input terminal 12 or the internal input terminal 13, and output. V from the external input terminal
An audio signal from an external video device such as a TR is output from the internal input terminal 13 such as an output sound of a BS tuner in the case of a television with a built-in BS (satellite broadcast), or a PCM sound transmitted separately. Connected.

The output of the first switch 6 is controlled and processed by the audio processing circuit 7 such as surround, volume, sound quality, balance and audio defeat. A specific circuit configuration is a well-known technique, and therefore its description is omitted. The output of the voice processing circuit 7 is input to the second switch 10. The second switch 10 outputs a necessary audio signal to the headphone switch 8 and the headphone terminal 11 according to the mode selection. Headphones are connected to the headphone switching device 8 in the conventional manner, and another headphone is connected to the headphone terminal 11.
In the headphone switcher 8, when the headphones are not connected, the audio signal is bypassed and output to the speaker 9. When the headphones are connected, the audio signal does not flow from the speaker and can be heard only by the headphones. Signal selection, control, etc. are usually performed by a microcomputer, but since this is a well-known technique, its explanation is omitted here.

FIG. 2 shows an example of a circuit diagram of the second switch 10 and the headphone terminal 11. The signals of the two channels (voice 1, voice 2) input to the second switch 10 are switched by the switch S.
It is input to the headphone terminal 11 via 1 and S2. Further, it is input to the headphone switching device 8 via the switches S3 and S4. For example, voice 1 from the speaker and voice 2 from the headphones
When listening to, the switches 3 and 4 may be used to select the a side and the switches 1 and 2 may be used to select the b side. At this time right,
The left channel has the same sound (monaural). The voice 1 and the voice 2 must be selected by the first switch 6 so that they are input to the second switch 10.

FIG. 3 is a block diagram of an audio signal switching device according to another embodiment of the present invention. Of those shown in FIG.
Antenna 1, tuner 2, audio intermediate frequency detector 3, FM
The detector 4 and the voice multiplex demodulator 5 are the same as those shown in the first embodiment, and their connections are also the same. Reference numeral 21 is a third switch, 7 is a voice processing circuit, 8 is a headphone switch, 9 is a speaker, 11 is a headphone terminal, 12 is an external input terminal, and 13 is an internal input terminal.

The structure and operation from the antenna 1 to the voice multiplex demodulator 5 are the same as those in the first embodiment described above, and therefore detailed description thereof will be omitted.

The output of the voice multiplex demodulator 5 is the third switch 21.
To the external input terminal 12 and the internal input terminal 13 and are output after being switched. An audio signal from an external video device such as a VTR is transmitted from the external input terminal, and an output sound of the BS tuner is transmitted from the internal input terminal 13 in the case of a television with a built-in BS (satellite broadcast). The incoming PCM voice or the like is connected. Third switching device 2
In 1, the necessary audio signal is output to the two audio processing circuits 7 by mode selection. That is, the circuit configuration is such that the audio signal can be selected independently for the speaker and the headphone. The audio processing circuit 7 controls and processes surround, volume, sound quality, balance, audio defeat, and the like. A specific circuit configuration is a well-known technique, and therefore its description is omitted. The output of the voice processing circuit 7 is input to the headphone switcher 8. The other audio processing circuit 7 is input to the headphone terminal 11. The voice processing circuit 7 is added as needed. Headphone changer 8
Then, the conventional headphone is connected, and another headphone is connected to the headphone terminal 11. In the headphone switcher 8, when the headphones are not connected, the audio signal is bypassed and output to the speaker 9. When the headphones are connected, the audio signal does not flow from the speaker and can be heard only by the headphones. In addition, the headphones connected to the headphone terminal 11 independently of this can listen to any voice selected by the third switch 21.

The well-known video signal processing and the like are omitted. Also, the configuration was explained in the form of a TV receiver,
If a speaker is considered as an output terminal to an external device, it is obvious that a VTR having a headphone terminal has the same effect.

[0019]

As is clear from the above description, according to the present invention, after switching multi-channel audio signals,
The volume and sound quality are adjusted, and the system is configured to switch to two systems and output to the speaker and headphones, so it is possible to listen to the voice that is arbitrarily selected independently of the voice heard through the speaker. .

[Brief description of drawings]

FIG. 1 is a block diagram according to a first embodiment of an audio signal switching device of the present invention.

FIG. 2 is a diagram showing an example of a second switching device and a headphone terminal of the audio signal switching device according to the first embodiment of the invention.

FIG. 3 is a block diagram according to a second embodiment of an audio signal switching device of the present invention.

FIG. 4 is a block diagram showing an example of a conventional audio signal switching device.

[Explanation of symbols]

 5 audio multiplex demodulator 6 first switching device 7 audio processing circuit 8 headphone switching device 9 speaker 10 second switching device 11 headphone terminal 21 third switching device

Claims (2)

[Claims] 1. A first switching between multi-channel audio signals
Switching means, audio signal processing means for adjusting the volume, sound quality, etc. output from the first switching means, second switching means for switching the output of the audio signal processing means to two systems, and the second A headphone switching means for switching one output of the switching means to a speaker or a headphone; a speaker using the output of the headphone switching means as an input;
An audio signal switching device having a headphone terminal to which the other output of the switching means of is input. 2. A first switching means for switching multi-channel audio signals to two systems, a first audio signal processing means for adjusting volume, sound quality, etc. of one output of the first switching means, The headphone switching means for switching the output of the first audio signal processing means to the speaker or the headphones, the speaker to which the output of the headphone switching means is input, the volume of the other output of the first switching means, the sound quality, etc. An audio signal switching device comprising: a second audio signal processing means to be adjusted; and a headphone terminal to which an output of the second audio signal processing means is input.