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DESCRIPTION JPH09149338

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DESCRIPTION JPH09149338
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio output circuit of a television receiver.
[0002]
2. Description of the Related Art An audio output terminal is known as disclosed in Japanese
Patent Application Laid-Open No. 3-16500.
[0003]
In the above publication, the headphone amplifier and the audio output amplifier can be
controlled in conjunction with each other.
[0004]
SUMMARY OF THE INVENTION The above-described conventional audio output circuit has a
variable audio output (VARIABLE AUDIO OUT or less) that can be varied in conjunction with an
audio volume.
And a fixed audio output (FIXED AUDIO OUT below F. A. O.) which sets the audio volume to a
certain value and outputs an audio signal of a fixed level.
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And the output terminal of (independently).
[0005]
According to the present invention, the same output terminal is V.A.O.6 depending on whether
the audio output is made variable or fixed at a fixed level in conjunction with the audio volume of
the television receiver. Or F.A.O. The purpose is to be able to switch and select.
[0006]
SUMMARY OF THE INVENTION In order to solve the above problems, the audio output circuit of
the present invention can select whether to mute the power amplifier or not to output audio from
the speaker by microcomputer control. Depending on whether the audio output is made variable
or fixed at a fixed level in conjunction with the audio volume of the television receiver, the same
output terminal is VAO Or F.A.O. It is characterized in that it can be switched and selected.
[0007]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the invention as set
forth in claim 1, according to the first aspect of the present invention, the audio circuit of a
general television receiver outputs sound from the speaker and the sound can not be output from
the speaker. An output terminal that can change the audio signal output in conjunction with the
audio volume of the television receiver and an audio signal of a certain level when the audio can
not be output from the speaker, and the audio signal of a certain level is set. An audio output
circuit configured to share the same output terminal that can output And F.A.O. It is possible to
select either of the switching.
[0008]
Hereinafter, an embodiment of the present invention will be described with reference to FIG.
(Embodiment) FIG. 1 shows a block diagram of an audio output circuit according to an
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embodiment of the present invention. In FIG. 1, reference numeral 1 is a volume circuit, 2 is a
control microcomputer, 3 is a power amplifier, 4 is an audio output terminal, 5 is an L speaker,
6R speaker, and 7 is a control line. Next, the operation of the component device will be described.
[0009]
When the control microcomputer 2 instructs the power amplifier 2 not to output an audio signal
and mutes it, the control microcomputer 2 can change the volume circuit 1 so that the output
level can be freely changed from the audio output terminal 4.
[0010]
Further, by sending certain data to the volume circuit 1 by the control microcomputer 2, an
output of a fixed level (0.5 Vrms) can be output from the audio output terminal 4.
[0011]
Next, the control microcomputer 2 instructs the power amplifier 3 to output an audio signal, and
when driving the L speaker 5 and the R speaker 6, the control microcomputer 2 interlocks with
the volume circuit 1 of the television receiver. Then, the variable output is output from the audio
output terminal 4.
[0012]
As described above, according to the present invention, the F.A.O., V.A.O.
For this purpose, it is not necessary to have separate output circuits and separate voice output
terminals, and by using two functions separately with the same output circuit and voice output
terminal, it is possible to obtain low cost and high functionality.
[0013]
Brief description of the drawings
[0014]
1 is a block diagram of an audio output circuit of a television receiver according to an
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embodiment of the present invention.
[0015]
Explanation of sign
[0016]
1 Volume circuit 2 Control microcomputer 3 Power amplifier 4 Audio output terminal 5 L
speaker 6 R speaker 7 control line
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