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JPS5762481

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5762481
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a television + 1 television
receiver 1117 having a general audio multiplex circuit, the second section is a block diagram
showing an audio multiplex circuit having an intermediate speaker, and FIG. 3 is the present
invention. FIG. 4 is a block diagram showing an audio multiplex output circuit according to the
present invention, and FIG. 4 is a circuit diagram showing a specific example of a control circuit.
12 · · · · · · · · · · multiple judgment circuit, 17 · · · manual switch, 18 · · · mode switching circuit, 19 ·
· · · · · · · · · · · · · low Low-pass filter 22... Middle (third) speaker 23 ........ mode detection circuit 24.
28.35.38 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · first audio output circuit B · · · · · · · · C · · · · · · mode selection circuit, b '· · · · · ·
mode switching circuit of the secondary audio broadcasting time of the output signal.
DETAILED DESCRIPTION OF THE INVENTION In the television receiver for audio multiplex
broadcasting, the present invention is to make the intermediate speakers provided to enhance
the stereo sound effect and to make the sound image unity prominent, while not operating
during two audio broadcasting. Two audio multiplex circuits with an intermediate speaker for
enabling clear and distinct viewing of audio, generally the right and left (second) speakers of a
television receiver with an audio multiplex circuit, 2.) When used in close proximity to the main
body of the receiver, it is less likely to sense the stereo motor 1 and the effect. Therefore, there is
a type of television receiver in which the receiver and the left and right speakers can be
separated and viewed to some extent. However, in the case of such a format, in the television
receiver, the main body of the television is different from an ordinary stereo device 2-and the
receiver main body is positioned in the middle between the left and right speakers. An
intermediate speaker was provided in the receiver body to give a sense of unity. For this reason,
a television receiver that receives audio multiplex broadcast sound has a first speaker that
outputs all starboard audio signals, a second speaker that outputs left reconnaissance audio
signals, and a sound change effect of the dual speakers. Have an intermediate speaker system
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provided to enhance the Since this intermediate speaker is provided for stereo broadcasting as
described above, it will be described below when receiving two audio broadcasts), '? There are
several disadvantages: 1) The following is described with reference to FIGS. 1 and 2 with full
reference. FIG. 1 is a block diagram showing the construction of a television receiver having a
general audio multiplex circuit hardware. FIG. 2 is a block diagram showing an audio multiplex
circuit gold provided with the above-mentioned third speaker. The configuration of FIG. 1 will be
described. The reception signal input to the antenna 1 is supplied to the video intermediate
circuit 3-wave amplification circuit 3 through the entire tuner 2, and this circuit 3 transmits the
video signal to the Braun tube 5 through the video control circuit 4. It is acidified to be
regenerated. The circuit for controlling the audio signal is configured to be manually operated by
an i voice detection circuit 6 for detecting the audio multiplex combined signal separated from
the video intermediate frequency amplification circuit 3. The voice detection circuit 6 is
connected to a low pass filter through which the main signal M passes, and a band pass filter 8, i!
The sub-signal S? Is sent to the matrix circuit 11 via the 1 channel detection circuit 9 and the low
pass filter 1 o respectively. l-I will supply, I am a seaweed. Further, a multiplex judgment circuit
[for judging the broadcast mode of the voice multiplex synthetic signal is connected to the band
pass filter 8, and the multiplex judgment circuit 12ki is configured to perform a predetermined
operation.
The matrix circuit xiu and the first voice @ are connected to the first speaker 14 via the amplifier
circuit 13 to constitute a first voice output circuit A1. Further, the second audio side is connected
to the second speaker 14 Km via the amplifier circuit uf, and the second audio output circuit Btconstitutes, and the manual switch 17 switches the mode to switch the operation of the matrix
circuit 11. The circuit 18 is connected to the matrix circuit 11 via a circuit 18 to form a mode
selection circuit Ct. FIG. 2 is a block diagram showing the above-described general-purpose audio
multiplexing circuit. In the configuration of FIG. 2, the first voice of the mod 1 circuit 11 is
connected to one input end of the adder 、 and the second voice side is connected to the other
input end of the adder 膀. There is. The intermediate speaker tHc is connected via the adder 19Fi
low-pass filter addition / amplification circuit 2N. The operation of the audio multiplexing circuit
of the television receiver having the above configuration will be described. However, #II!
Connected from the adder 鱒 to the intermediate speaker Mk in FIG. 2 to each output terminal of
the matrix circuit H in FIG. Describe l. The audio polyphase 5-component signal, which is posttuned by the audio detection circuit 6, is applied to the main signal My ratio output and the
matrix circuit 11 by a low pass filter. On the other hand, the sub-signal S is band-amplified by the
band-pass filter 8, and the amplified signal is post-adjusted by the sub-channel detection circuit 9
to become an audio signal, and passes through the low pass filter 10i to the matrix circuit 11. .
Also, the voice multiplex synthesis signal is included in the control signal &. This control signal a
is a television receiver (a signal for the machine to distinguish between two-voice broadcast and
stereo broadcast and t-. That is, the band-pass filter 8 is also for detecting the control signal a
from the speech synthesis multiplex signal. It is input to the control signal aFi multiplex
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determination circuit 12 which performs the above-mentioned function. The multiplex
determination circuit is a circuit that causes a switching operation to output the main signal M
and the sub signal S from the first and second voices-of the matrix circuit 11 when the control
signal a is in the two voice broadcasting mode. . Also, when the control signal a is in the stereo
broadcast mode, the main signal and the sub-signals are output so that the right signal R from
the first audio 61 side of the tricks circuit 11 and the left signal from the second audio side. The
signal tube is operating. The operation of the mode selection circuit C will be described. The
external switch 17 # 'i is manually operated to control the mode switching circuit 18. The mode
switching circuit 18 is sent to the switch circuit 2 matrix circuit 11 at the time of the abovementioned two audio broadcasting, and is exchanged between the main and auxiliary signals MFz of the matrix circuit 11 and the first and second audio sides. It is a circuit which mixes each.
For example, the sub-signal S is output to the first voice 1111, and one,. Each signal M-8 is
switched so that the main signal M is output (hereinafter MS mode), or the main signal M is
output so as to output the main signal M on both the first voice side and the second voice side Or
the first audio side and the second audio side can be freely selected by the manual switch 17 so
as to output the sub signal S 會. The M mode corresponds to monaural broadcasts, and the S
mode corresponds to stereo broadcasts, and each broadcast can be selected by a switching signal
of manual 7-itch correction described later. Both audio signals of the IJ circuit H are amplified by
the respective amplifiers 16 and applied to the first and second speakers. Such a configuration is
generally used as a stereo circuit, but by connecting the intermediate speaker Wig shown in FIG.
2, its stereo effect and sound effect can be further enhanced. However, in the configuration in
which the intermediate speakers are all connected, there is no inconvenience at the time of
stereo broadcasting and monaural broadcasting, but at the time of two audio broadcasting, the
first audio side and the second audio II mentioned above have different signals. When outputting
(main signal and all signal) k, the mixed signal of the main signal M and the sub signal S is to be
amplified from the intermediate speaker 4. Generally, in this case, since bilingual broadcasting is
performed, two different fc language information is output to the intermediate speaker, resulting
in a disadvantage that the clarity is extremely reduced and it becomes difficult to pick up eight
colors. 8- The present invention has been made in view of the above-mentioned point, and it is a
mode detection circuit which receives a signal of a multiplex judgment area for detecting a
broadcast signal and further receives a switching signal of a mode switching circuit, and this
mode detection circuit By providing an audio cancellation circuit t- for canceling the middle door
signal of the fkjft F-circuit by the detection signal of the 'kUJ', the main signal and the '-' signal
are mixed and supplied to the third speaker. It is an object of the present invention to provide an
audio multi-output circuit t- that is adapted to stop. An embodiment of the present invention will
be described below based on FIG. 6 and FIG. The block diagram of the voice multiplex output
circuit shown in FIG. The description of KvA will be omitted as Fi and Sum 1 are added to FIGS. 1
and 2 and 1 ′ ′. The output terminal of the multiplex discrimination good path 12 is connected
to the first input terminal of the mode detection circuit, and the moat switching signal b 'through
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the rL + motion switch 17 is the second input terminal of the moat detection circuit. There is no
way to enter it.
The output end of this mode board all path is connected to the input end of the sound 9-voice
cancellation circuit. The input 熾 of this voice cancellation circuit 接 続 is connected to the output
of the adder 、, and the output of the voice cancellation circuit is connected to the input of the
low pass filter base to constitute the control circuit of the present invention. . FIG. 4 is a circuit
diagram showing a specific example of a control circuit consisting of a mode detection circuit
and an audio cancellation circuit shown in FIG. The output terminal of the determination circuit U
is connected to the first input terminal 311K of each mode detection circuit, and is If connected
to the base of the transistor T1 via a resistor TI. Also, the terminal 接 続 is connected to the
power supply terminal via a dual audio broadcast display diode and a resistor w. Furthermore, a
resistance wedge is disposed at the terminal leg and -IIJ at the power supply end. The collector of
the transistor 篇 is connected to the power supply terminal via a resistor 33V, and the ε pole is
grounded. The MS mode terminal of the mode switching circuit magazine is connected to the
second input terminal uK of the mode detection circuit n. The terminal 4 is connected to the base
of the transistor of the emitter ground. The collector 10 of the transistor 構成 is configured to be
the collector KPM of the transistor unit to obtain a signal 1 for canceling the audio signal.
Terminal U is also connected via resistor 36 to the power supply terminal to provide a base bias
for the transistor. The MS mode output end of the mode switching circuit 18 is connected to the
MS terminal of the manual switch 17, the S mode output end is connected to the S terminal of the
manual switch 17, and the M mode output end is connected to the manual switch 170M
terminal. It is connected. The sliding terminal of this manual switch 17 is grounded. The
transistor and the collector of the transistor gate are connected to the base of the switching
transistor at the emitter ground via a resistor 37. The base of the transistor 蕊 is grounded via a
capacitor st. As described above, the mode detection circuit n includes the transistor and the
transistor resistor 27.23.33.36, 37. It is composed of a capacitor. (The collector of the transistor
54 forming 1-voice cancellation i path 54 vc is connected to both the junction of capacitor
chrysanthemum and company through which the audio signal disposed between the adder 19
and the low pass filter is passed . Also, it is grounded via the connection point Fi resistance 42.
The operation of the voice multiplex one path having the above configuration will be described.
The outline! In the case of a signal (approximately 0 [V]) output by the multiplex discrimination 1
path 12 at the time of #i and two audio broadcasting and when the MS terminal of the manual
switch 17 is grounded, the switching transistor 38 for voice cancellation is turned on. Thus, the
audio signal supplied to the intermediate speaker 22 is eliminated.
In the case of the double tone% symbol, the diode IFi is turned on by the voltage of the output
signal b '(approximately 0 [V]) of the above-mentioned "multiple determination circuit 12" and
the power supply terminal. A certain one of the terminals ms of the manual switch 17 and m + 1
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# i correspond to the respective signal modes MS, M and S at the time of the two audio
broadcasting, and the respective modes are selected. Since the transistor オ ン is turned on by
the output signal b ′ of the mode switching circuit brittle when the manual switch 17 會 m
terminal (second and second voice side and 奄 main signal-12 = issue) is selected, the mode
detection circuit のThe output signal is approximately O [■] and the transistor 3s is off.
Therefore, the output signal (main signal M) of the adder passes through the voice cancellation
circuit leg and is driven to the third speaker 22. Next, when the manual switch 17 is selected to
be 3 terminals (both the second and the second audio side sub-signals), the output signal b 'of the
transistor opening mode switching circuit 18 is turned on from 9's. The output signal of the path
n is approximately 0 [V] and the transistor is off, and the same operation as described above is
performed. Further, when manual switch 17 km Si (1st sound, 5 voices side to main signal or side
signal, 2nd sound to side 1 side scour: Taka 4-1 / signal or main signal), transistor s # ' When the
ims terminal is grounded, it is turned off, and the output signal b 'of the mode detection circuit
becomes approximately the power supply voltage value. Since the transistor 蕊 is turned on by
this, the output signal (M + S signal) 13− of the adder 19 does not drive the intermediate
speaker n. More specifically, at the time of stereo broadcasting, the output of the multiple
judgment h * u is set to Dio-'kM2. Since the 'i, #r' 2 lamp and transistor と な る are turned on,
the output signal of the adder ′ can be passed through the parent of the R + Li voice
cancellation circuit parent, and the best stereo effect matched with the image can be viewed. . As
described above, according to the present invention, when the main signal and the sub signal are
output to the first speaker and the second speaker at the time of two audio broadcasting, the
audio path of the intermediate speaker that mixes and outputs these signals The two different
tones μ of the signal are not mixed and output from the intermediate speaker, and there is no
discomfort when viewing two audio broadcasts. This has the effect of being able to listen to the
clear two sounds of the speaker.
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