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JPH0698399

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DESCRIPTION JPH0698399
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides an
output switching circuit for left and right audio channels that includes audio output amplification
circuits for left and right audio channels and left and right dedicated audio channels and to which
the left and right external speakers can be connected. The present invention relates to a
television receiver for switching the frequency characteristics of audio output signals of left and
right audio channels when the user connects the left and right external speakers.
[0002]
2. Description of the Related Art In a conventional television receiver with an external speaker
terminal, in the case of driving an external speaker by left and right audio output signals, a
television as disclosed in the magazine, Television technology '88 issue. This is generally
performed by switching the output signal of an audio output amplification circuit for driving an
internal speaker of a television receiver with a switch or a relay.
[0003]
However, in recent years, as a means of achieving high sound quality, many television receivers
of a 3D speaker system have been equipped with a speaker dedicated to bass in addition to the
left and right speakers.
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1
In a television receiver adopting this 3D speaker system, generally, the audio output signals of
the left and right speakers prevent high frequency filtering in the signal path to prevent acoustic
interference with the audio output signal of the speaker dedicated to bass. It inserts it and takes
out and outputs only the middle and high tone component of the voice signal. For this reason,
when the external audio signal is driven by switching the left and right audio output signals as it
is, there is a problem that the bass becomes insufficient.
[0004]
An object of the present invention is to provide an audio output switching circuit which
automatically detects the speaker output mode of the receiver selected by the user and switches
the frequency characteristics of the audio output signal without the above-mentioned drawbacks
of the prior art.
[0005]
In order to achieve the above object, a speaker output mode of a receiver selected by a user is
automatically detected, and an input having different frequency characteristics at an input stage
of an audio output amplifier circuit. An input signal switching circuit for switching signals is
provided.
[0006]
Since the speaker output mode of the receiver is selected and set by the user, the setting signal is
detected, and the input signal of the audio output amplifier circuit is controlled and switched by
this setting signal.
[0007]
DESCRIPTION OF THE PREFERRED EMBODIMENT The present invention will be described by
way of one embodiment shown in FIG.
[0008]
FIG. 1 is a block diagram showing the main configuration of an audio output switching circuit in
a television receiver according to this embodiment.
In the figure, 1 and 2 are left and right voice channel signal input points, 3 is a user's speaker
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2
output mode setting signal input point selected by the user, 4 is a left and right voice channel
signal 1 , 2 high-pass filters to extract middle-high range components, 5 is a mixing circuit for
mixing left and right audio channel signals 1 and 2, and 7 is a low-pass filter to extract low-range
components from the output of mixing circuit 5 , 8 are first audio output amplifier circuits for
driving left and right speakers of the receiver or left and right speakers connected from the
outside; 6 is left and right audio channels input to the first audio output amplifier circuit 8 An
input switching circuit 9 for switching a signal, 9 is a second audio output amplifier circuit for
driving a speaker dedicated to bass of the receiver by an output signal of the low pass filter 7, 11
is a left of the first audio output amplifier circuit 8 , Right audio channel output No. 10 is an
output switching circuit 11 and an input switching circuit 6 according to a setting signal of a
speaker output mode of the receiver selected by the user. And a control circuit for controlling the
second audio output amplifier circuit 9, 12 and 13 are output terminals of left and right audio
channel output signals for driving left and right speakers of the receiver, and 14 and 15 are
externally connected The left and right voice channel output signal output terminals for driving
the left and right speakers, and the output signal output terminal for driving the bass speaker of
the receiver.
[0009]
Here, in the present embodiment, left and right speakers possessed by the receiver and speakers
dedicated to bass are connected to the output terminals 12, 13 and 16, and external speakers are
connected to the output terminals 14 and 15 by the user. It shall be.
The output switching circuit 11 is, for example, a switching circuit composed of a plurality of
electromagnetic induction relays.
The output switching circuit 11 can also be configured as a slide switch that can be manually
switched by the user.
In addition, there are a speaker mode (hereinafter referred to as an internal speaker mode)
possessed by the receiver and an external speaker mode (hereinafter referred to as an external
speaker mode) connected by the user as speaker output selection modes of the receiver
selectable by the user. To be.
[0010]
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3
Next, the operation of the block diagram shown in FIG. 1 will be described.
[0011]
First, when the user selects the internal speaker mode in the speaker output mode selection of
the receiver, the control circuit 10 in the input switching circuit 6 extracts high and low
frequency components of the left and right audio channel signals 1 and 2. The output signal of
the wave generator 4 is selected and input to the first audio output amplifier circuit 8.
In the output switching circuit 11, the control circuit 10 causes the output signal of the first
audio output amplification circuit 8 to be output to the output terminals 12 and 13 to drive the
left and right speakers of the receiver. The left and right audio channel signals 1 and 2 are input
to the second audio output amplifier circuit 9 via the mixer circuit 5 and the low pass filter 7 for
extracting low frequency components, and are exclusively used for the bass of the receiver. Drive
the speaker.
[0012]
Next, when the user selects the external speaker mode in the speaker output mode selection of
the receiver, the input switching circuit 6 causes the control circuit 10 to input the left and right
audio channel signals 1 and 2 input signals (high-pass filtering The signal not passing through
the unit 4 is selected as it is and is input to the first audio output amplifier circuit 8. In the output
switching circuit 11, the control circuit 10 causes the output signal of the first audio output
amplifier circuit 8 to be output to the output terminals 14 and 15 to drive the left and right
speakers externally connected. Further, the control circuit 10 mutes the second audio output
amplifier circuit 9 so that the output signal of the second audio output amplifier circuit 9 is not
output.
[0013]
By the above operation, it is possible to automatically detect the speaker output mode of the
receiver and switch the frequency characteristic of the audio output signal for driving the
speaker.
[0014]
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4
When a slide switch manually switchable by the user is used as the output switching circuit 11, it
is possible to detect and control the mechanical switching.
[0015]
As described above, according to the present invention, it is possible to improve the frequency
characteristics at the time of external speaker output in a 3D speaker system television receiver.
10-05-2019
5
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