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JPS4861804

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DESCRIPTION JPS4861804
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an electric circuit diagram of an embodiment
of a four-channel volume balance adjusting circuit according to the present invention, FIG. 2 is a
diagram showing the arrangement of speakers thereof, and FIGS. It is a signal waveform diagram
based on an oscillating signal. 1 to 4 · · · First to fourth channel amplifier, 5 · · · CR oscillator, 8 to
9 · · · First to fourth channel output terminals, vR1 to vR4 · · · ... ... Volume adjustment variable
resistor, S1 to S4 ... ... Balance adjustment switch. -7 One opening 48-61804 (2) years old? 8 8 1
開 48-61804 (3) 3 years old (A) (8) 9 1
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a volume
adjustment circuit for a channel, and provides a volume balance adjustment circuit configured to
be able to control the volume balance of a da-channel reproduction signal extremely simply by
adjusting the volume balance of each λ channel. The purpose is to Conventionally, in the volume
adjustment of the channel reproduction system, it is easy to determine the level difference
between the left and right signals in a specific bite manner, so that the volume arbitration can be
performed to some extent easily while listening to music. However, in the case of the reference
channel reproduction system, since the signal reproduction becomes very complicated due to the
arrangement of the speakers, etc., the volume balance adjustment of the reproduction signal of
the reference channel is extremely complicated compared to the case of the one channel stereo
signal. There is a problem that is difficult to control. , 48-61804-03 The present invention
provides a circuit which solves the above problems and enables easy and reliable adjustment of
the volume of the reproduction signal of one of the channels. Each will be explained. FIG. 1
shows an electric circuit diagram of seven embodiments of the volume balance adjusting circuit
of the dual channel amplifier according to the present invention. In the figure, / -IIi; j first to the
first channel amplifiers, variable resistors VB for adjusting the volume are provided at the
respective input sides of the amplifiers l to da. Loudspeaker SP arranged in a coco method as
shown in FIG. K, f. To 8P4, respectively. SS4 is a changeover switch for balance adjustment
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configured for each of the seventh to fourth channel signal systems. The changeover switches S
to S4 are interlocked, and the signals to be amplified of the seventh to the seventh channel are
applied to the respective contacts α by ch / -ch. Break Is! The circuit enclosed by is a phaseshifting man oscillator circuit, and transistors QI and O, RK? )4400∼700H。 It is
configured to oscillate about a frequency signal. The output of the 4B-61804 OR 04 oscillation
circuit 5 is connected to the capacitor 0. Through the n1 variable resistor VB, and is taken out to
the terminal 6 at an appropriate level. The terminal t is connected to the contact side of the
changeover switch SI% S6% S. One side of the changeover switch S is connected to the variable
resistor vR1 between the contacts of the changeover switch S and the other side of the switch S,
and the variable resistor VR, ' A phase inverting circuit is connected by transistors Q in series. In
addition, one side of the changeover switch S6 and the switch S connected in parallel to the
switch S are connected to the variable resistor v! !
4 'is connected, and between the switch S and the switch S, a phase inverting circuit is connected
by a variable resistor VB,' and a transistor q in series with this ◇ switch S, S , Interlocks with
each other, and as shown, when the switch S is closed, the switch S6 is opened. Changeover
switch s in the third channel signal system. A switch island is inserted between the switch and
the variable resistor VB, and the switch C is 48-61804-05, and in the third channel signal system,
the switch (switch S4 between the switch S4 and the variable resistor VR is switched S S is
inserted. Changeover switch S and S. Is interlocked with the switch S, and as shown, the switch S.
When is open, switches 8 and S9 are closed. The power supply voltage B is applied to the
terminal 7, and the phase inversion circuit by the transistor Q, the OR oscillation circuit j1 by the
transistor Q1, and the transistor 9. The bias voltages are respectively applied to the phase
inverting circuits according to Next, the operation of the above configuration circuit will be
described. When playing back the da-channel, the switch 8s is closed and the switch 8 is opened
as shown in the figure. This tow switch S is open and to the switch S is closed. Further, the
changeover switches S and -S4 are connected to the contacts h1 respectively. As a result, the
signal oscillated n by the OR oscillation circuit j is led to a signal system of the first and third
channels via the variable resistor 7 'and VR,' from the terminal 6 and is misrepresented. The
signal led to the respective channel / signal system passes through the changeover switch S +
and FIB, respectively, and passes through the 48-61804-06 'volume control variable resistor VR
and VB for each channel amplifier / and J. Speakers sp, respectively amplified. When the switch
SP is switched to open the switch Ss and close the switch S6, the oscillation signal from the OR
oscillation circuit S passes through the variable resistors VR4 'and yB and I, respectively as
described above. The signal is led to the input signal system of the second channel, the second
channel, and is produced by the speakers SP, 8P via the variable resistor VR4, IR, the amplifier
terminal, the output terminal //, and the output terminal 9 /. Here, since the phase inversion
circuit is configured with respect to the third channel signal system and the first channel signal
system of the oscillation signal of the OR oscillation circuit j, the oscillation signal of the OR
oscillation-path j is the switch S, There is a phase difference of 100 between the 1 channel signal
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system and the changeover switch S and the third channel signal system thereafter, and the
oscillation signal of the OR oscillation circuit j is the reference channel signal system and
changeover switch St after the changeover switch S4. There is a phase difference of / 100 with
the first channel signal system in the following.
(6) 48-61804-07: □ Also for the 1st channel signal system and the 1st channel signal system
□□ system “f'ry * tb Mf'ry * tb 8 series 1 system, each changeover switch 84 is the same as
above. The signals of the channel signal systems of each other after% 811 □ have a phase
difference of “tro” with one another. Therefore, the changeover switch 8. The variable resistors
VR, '-VR4' in the previous stages of ~ S4 are variably adjusted in advance appropriately, and are
set so that the signal level of each A is at the same □ -level in each of the changeover switches S,
~ S4. Thus, when the switch and the signal at S4 are, for example, in the waveform as shown in
FIG. 3 (4), the switch S. The waveform of the signal at S and S has the same amplitude as that of
the waveform shown in FIG. Generally, when reproducing and producing co-signals having 1
ro00 phase difference-at the same level, the respective reproduction signals cancel each other,
and the total reproduction sound volume decreases near zero. In the TXJ 11 speaker
arrangement shown in FIG. 2, the signal from the speaker 8P, which is produced based on the
above-mentioned knowledge based on the oscillation signal of the OR oscillation circuit j, is the
signal from the speaker 8 horse and the signal from the speaker 8 horse The signals from the
speaker sp4 are in antiphase with the signals from the speaker BP, the signal from the speaker
SP, and the signals from the speaker SP, respectively. Therefore, next we will describe the listener
and channel volume balance adjustment. The listener is at an arbitrary position on the
reproduction sound field shown in FIG. 2 and sets each switch to the switching mode as shown in
FIG. That is, the changeover switches S and XS are connected to the contacts respectively, the
switch S is closed, and the switch S is opened. Normally, the switch S- is open and the switch S1 is
closed. At this time, the oscillation signals upstream of the OR generator are sounded in opposite
phase to each other from the speakers sp and SP. The listener listens to the two signals from the
speaker sP1% SPg, and adjusts the variable resistance #V horse, VB, appropriately to a position
where a dip is generated in the total sound production amount. Then, switch S is switched on and
switch s6 is switched on, the oscillation signal from the OR oscillator j is produced in the
opposite phase from the speakers SP and SP, and the listener n1 appropriately adjusts the
variable resistors vB4 and vRl (1) 48-131804-09 like the total sound production volume to
adjust the position to produce a tip. By the above adjustment operation, the volume balance
adjustment in the first channel signal system and the third channel signal system, and the first
channel signal system and the λ channel signal system is performed.
Next, the switch S is closed again, and the switch S is switched to open, and then the switch S is
switched to close and the switch S, S is switched to open. As a result, the oscillation signal
upstream of the OR generator passes through only the first channel signal system and the second
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channel signal system, and sounds are generated in opposite phases to each other from the
signals hs, h and 8p. The listener is a variable resistor I # v formula and VB, or a variable resistor
VB. And V- are adjusted appropriately to a position where a dip is generated in the sound
production amount. By this adjustment operation, volume balance adjustment is performed on
the first channel signal system and the λ channel signal system, and the third channel signal
system and the third reference channel signal system. The adjustment of the volume balance 4861804-10i of the seventh to seventh channel signal systems in the listening position of the
listener and the reproduction sound field mode is performed by the respective adjustment
operations. The listener switches on after completing the above adjustment. Is closed (switch S is
opened), and changeover switches 81 to S4 are switched to contact point a. Each channel signal
ck / −chllJd applied to the contact point α is heard at a volume adjusted to a balance n from the
speakers sp and ~sp4, respectively. As described above, according to the present invention, the
reference volume control circuit according to the present invention is not a dynamic signal, but a
single signal having a phase difference with each other at a constant level between the response
units in the speaker arrangement. This is a signal, and by adjusting one adjacent channel so that
the volume generated by the speakers of each adjacent λ channel decreases, eventually the
balance adjustment of the reference channel is performed, so the da-channel signal is extremely
easily and surely. It has the feature that balance adjustment of the volume of
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