JPH04132476A - Sound defeat device - Google Patents

Abstract

PURPOSE:To prevent undesired sound interruption of a monitor sound output of a television receiver by using a control circuit to individually control a defeat circuit for monitor sound output and a defeat circuit for speaker sound output. CONSTITUTION:Sound defeat circuits 6, 7 eliminating undesired sound when a sound signal is changed over at two outputs of monitor sound output and speaker sound output are individually provided and a control section 13 controlling the sound defeat circuits 6, 7 in the different control mode is provided to a television receiver having the monitor sound output and speaker sound output. That is, in the case of surround changeover and sound menu changeover, only the defeat circuit 6 for the speaker sound output is active and the defeat circuit 7 for the monitor sound output is not active. Thus, the interference of the sound signal of the monitor output is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an audio defeat device provided in a television receiver having a monitor audio output and a speaker audio output.

BACKGROUND OF THE INVENTION In recent years, color television receivers have been equipped with audio defeat devices to eliminate unnecessary sounds when switching audio signals.

The audio output of a color television receiver includes the original audio output, that is, the audio output from the speakers, and the audio signal of the monitor output, and conventional audio defeat devices act on both audio outputs.

The configuration will be explained below with reference to FIG.

FIG. 3 is a block diagram showing the conventional audio defeat device and its peripheral circuits. In Figure 3,
1 is a surround circuit, 2 is a volume sound quality control circuit,
3 is a low frequency amplifier circuit, 4A.

4B is the L side (right channel side) and L side (left channel side) speakers. 5A and 5B are the L side and L side monitor output terminals. The audio defeat device includes a speaker output side audio defeat circuit 6 provided between the volume sound quality control circuit 2 and the low frequency amplification circuit 3;
It consists of a monitor output side audio defeat circuit 7 provided in front of the monitor output terminals 5A and 5B, and a defeat signal generation circuit 8 that simultaneously outputs a defeat signal to these audio defeat circuits 6 and 7. There is.

In the above configuration, the audio defeat device operates as follows. That is, the defeat signal generation circuit 8 sends a defeat signal to both the audio defeat circuits 6 and 7, and the audio defeat circuit 7 on the monitor output side that receives this defeat signal turns off the monitor audio output, and also outputs the defeat signal. The speaker output side audio defeat circuit 6 that received the signal eliminates the speaker audio output almost simultaneously.

Problems to be Solved by the Invention However, in the audio defeat device having the conventional configuration described above, the speaker audio output and the monitor audio output of the television receiver are simultaneously defeated every time. In other words, when operating the surround circuit 1 or volume control circuit 2 (when switching surround or audio menu), the monitor output audio signal that is unrelated to these switches is also defeated, causing the sound to be interrupted. This was causing inconvenience.

In addition, BS (Broadcasting Sa
e) In a television receiver with a built-in tuner, the BS tuner channel is fixed and the BS signal is output from the monitor output, and the television receiver itself does not accept signals from normal broadcast or video input. If you change the audio on the television receiver and defeat the speaker audio while receiving images, the monitor audio output, that is, the BS broadcast audio output, which should not change, will also be interrupted. It was causing inconvenience.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide an audio defeat device that does not cause unnecessary sound interruptions in the monitor audio output of a television receiver.

Means for Solving the Problems In order to solve the above problems, the present invention provides an audio defeat device provided in a television receiver having a monitor audio output and a speaker audio output.
Each of the two audio outputs is equipped with an audio defeat circuit that removes unnecessary sounds when switching audio signals.
A control section is provided to control each audio defeat circuit in different control modes.

Effect With the above configuration, the defeat circuit for the monitor audio output and the defeat circuit for the speaker audio output can be individually controlled by the control unit, so when switching surround sound or audio menu, or changing the BS tuner channel. If the audio is not output from the monitor output, but the audio is switched from the television receiver itself, only the speaker audio output defeat circuit should be activated and the monitor audio output defeat circuit must not be activated. This allows the monitor output audio signal to be uninterrupted.

Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram showing an audio defeat device and its peripheral circuits according to an embodiment of the present invention. In addition,
Components that are the same as those in the conventional audio defeat device are given the same reference numerals, and their explanation will be omitted.

As shown in FIG. 1, the audio defeat device includes a first defeat signal generation circuit 11 that applies a defeat signal to the audio defeat circuit 6 on the speaker output side, and an audio defeat circuit 7 on the monitor output side. a second defeat signal generation circuit 12 that outputs a feet signal;
These first and second defeat signal generation circuits 11
．． The control section 13 controls the speaker output-side audio defeat circuit 6 and the monitor output-side audio defeat circuit 7 via the control section 12 in different control modes. The control unit 13 includes a surround circuit l
When switching the previous circuit, that is, when switching channels, turning on the power, switching input mode, switching audio multiplex mode, etc., both defeat signal generation circuits 11.1
Both audio defeat circuits 6 and 7 are operated by generating a defeat signal from 2, while when switching circuits after surround circuit 1, that is, when switching surround circuits or switching audio menus, the first defeat circuit 6 and 7 are operated by generating a defeat signal from By generating a defeat signal only in the foot signal generation circuit 11, the speaker output side audio defeat circuit 6
While operating, the monitor output side audio defeat circuit 7 is stopped.

Note that 14 is an audio input switching circuit that selects and outputs a target audio signal from a plurality of audio inputs.

With the above configuration, when switching channels, turning on the power, switching input mode, and switching audio multiplex mode, both audio defeat circuits 6 and 7 operate to erase the audio from speakers 4A and 4B and the audio output from the monitor side. . Furthermore, when switching the surround sound or switching the audio menu, the speaker output side audio defeat circuit 6 is activated while the monitor output side audio defeat circuit 7 is stopped, which causes unnecessary sounds to be mixed in when switching the audio signal. Although the audio from the speakers 4A and 4B is muted, the audio output on the monitor side, which is not mixed with unnecessary sounds, is not muted, and the sound on the monitor side does not cut out due to the defeat operation.

Next, FIG. 2 shows another embodiment of the present invention.
It is compatible with a television receiver with a built-in tuner (not shown). The difference from the above embodiment is that the audio input switching circuit 21 or the BS audio signal from the BS tuner (fixed) and the audio input switching signal (switched between television signal, BS signal and video signal) are used. The two points are that one of the signals is selected and outputted to the monitor side, and that the forced BS circuit 22 is connected to the audio input switching circuit 21 and the control section 13.

The forced BS circuit 22 controls the control unit 13 when a BS audio signal is output from the audio input switching circuit 21 to the monitor side.
A defeat prohibition signal is output to the second defeat signal generation circuit 12 so that the second defeat signal generation circuit 12 is not operated, so that the monitor output side audio defeat circuit 7 is not operated.

With the above configuration, when a BS audio signal is output from the monitor side, the forced BS circuit 22 is activated and the operation of the monitor output side audio defeat circuit 7 is prohibited, and the monitor audio output is not defeated. Therefore, even if switching is performed regarding the audio on the television receiver main body side at this time, the monitor audio output (BS audio) will not break out.

Effects of the Invention As described above, according to the present invention, the defeat circuit for monitor audio output and the defeat circuit for speaker audio output are configured to be individually controlled by the control unit, so that surround switching and audio menu Do not activate the monitor audio output defeat circuit when switching, or when changing the audio on the television receiver side without fixing the BS tuner channel and outputting audio from the monitor output. It is possible to prevent unnecessary audio cutouts in the monitor audio output.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an audio defeat device and its peripheral circuits according to one embodiment of the present invention, and FIG. 2 is a block diagram showing an audio defeat device and its peripheral circuits according to another embodiment of the invention. Block Diagram FIG. 3 is a block diagram showing a conventional audio defeat device and its peripheral circuits. ■...Surround circuit, 2...Volume sound quality control circuit, 4A, 4B...Speakers 5A, 5B...
Monitor output terminal, 6... Speaker output side audio defeat circuit, 7... Monitor output side audio defeat circuit, 11... First defeat signal generation circuit,
12... second defeat signal generation circuit, 13...
- Control unit, 14... Audio input switching circuit, 21... Audio input switching circuit, 22... Forced BS circuit.

Claims (1)

[Claims] 1. An audio defeat device installed in a television receiver having a monitor audio output and a speaker audio output, and an audio defeat circuit that removes unnecessary sound when switching audio signals to these two audio outputs. The audio defeat device is equipped with a control section that separately controls each audio defeat circuit in a different control mode.