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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a connection diagram showing a conventional
volume control apparatus of stereo amplifier, FIG. 2 is a connection diagram showing a volume
control apparatus of stereo amplifier according to one embodiment of the present invention, FIG.
a and b are each a figure which demonstrates the effect of the volume control apparatus of the
stereo amplifier shown in FIG. 11, 12 ... pre-amplifier, 13.14 ... main amplifier, 15, 16 ... (volume
control) variable resistor, 17. 18. ... resistance, 19 ... (balance adjustment ) Variable resistor,
20.21 ... addition circuit, 22. 23 ... resistance 24.25 ... variable resistor (for mixing adjustment).
Fig. 1-Actual opening · Sho 5l-38401 (2) Fig. 2 Fig. 3 (a) 26-reason F 303 1 · · す 27 ()-32 (b) 26
(± 1) 3031 J [272-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a volume control
device of a stereo amplifier adapted to change sound image localization. As well as the stereo
amplifier company's vital output volume, the balance t of each of the left and right channels must
be taken into consideration, as it is conventionally shown in FIG. 1 for 7 ', preamp 1.2 and so on.
Polymes 5 and 6t are respectively interposed between the main amplifier 3.4 and 1 and a volume
1 for balance adjustment is interposed and connected between the output ends of the volume 5
and 6 respectively. Volumes 5 and 6 are interlocked, and the volume of each of the left and right
channels is held by vrIFl, and the volume of each channel is equally balanced by volume 1. The
result of this ws 尊 is R = A · αβr bird (L = A · αβAL. However, A: amplification degree of the
main amplifier J, 4 α: magnification βr by volume 5.6 βL, β L: doubler of each of left and right
by volume 1 ˜, L: output level R, L of preamplifier 1, 2: main amplifier Note that the output level
of 3.4 and the final level R and L do not mix in principle-the opposite level of remixing, the level
of the sound output effect of it is that of R1 and et al. The properties of stereo 7 onik of "7. − Γ4 only to reproduce. That is, although it is possible to correct the stereo effect to a certain extent,
if the balance is greatly inclined, the potential of the material can not be reduced), and the sound
image will also be released. Therefore, it was not possible to correct the book, such as poor
stereo effect of the source (sound source), bad separation between left and right, or too clear
separation. In order to improve such V point, it is possible to arbitrarily mix signal patterns of the
winter channel, to compensate for the incompatibility of the stereo effect possessed by the
source, etc., the stereo effect, the sound- It is intended to provide a volume adjustment control
unit # of Spreo Leo amplifier that can set the clearance, the clarification of the sound image, and
the division of the appropriate sound. An embodiment of the present invention will be described
below with reference to the drawings. As shown in FIG. 2, the variable resistors 75 and 16 and
the resistor J7. Are arranged between the preamplifier 11.11 and the main amplifier 13.14 of
each of the left and right channels. JJlt-Intervention continues in series. And this resistance J7. A
variable resistor 1g for adjusting the volume balance with one actuator grounded is inserted and
connected to the output of the JJ. And the output increase of the said prian 111.12 and the
variable resistor 1!
Adders xe and xx are respectively connected in the dark with the input ends of i and 111. That is,
when one input terminal of each of the adding circuits 2o and sr is directly followed by the
output end of the preamplifiers JJ and Jj, 加 K and the addition w times of 121.25 on the
opposite side are respectively performed via the resistors 22 and 23. ! Connecting the variable
resistor 24 ° 25 connected to the other human power 1 of O and further connected to the
follower point Ka end is the preamp 11 in the volume control device of the stereo amplifier
configured as described above. The output of .12 corresponds to each channel i. 820.21 ss added
and resisted! It is applied to the feedback circuit 21.20 of the other channel via 2.21. The amount
of transmission to the other channel of C. Add or remove by the 24.25. Thus, the adding circuit
20. The signal of the current channel and the signal of the other channel are introduced by-1], -1,
and added with ζζ, and the signal of the other O channel is extracted as a mixed signal. This
signal is a variable resistor IB, 1g, a resistor 17. It is led to the main amplifier 13 through III. For
example, assuming that the gain of addition @ path 20.21 is 1, (:: '! R0 + rrL6 (1) ′ ′ Le + rLRs
(21 °: 8 °: output level L0 of the preamplifier 11: output level rr of the preamplifier 12: mixing
ratio γL determined by the visible resistor 26 and the resistor 21; variable resistor 24 and the
resistor 22 The determined mixing ratio 8, ': output level L6' of the adding circuit 20: output level
of the adding circuit 21, the left and right signals are mixed. If the left and right signals are
mixed, the output of wsxa, xx is a usable resistor for volume control 36. The volume balance of
the left and right channels is adjusted by the variable resistors T-, + □, and -111, and the main
amplifiers IJ and J4fC are led and amplified. At this time, the output of the main amplifier 13.14
is R-A-.alpha..beta.r (Re + r), R.sub.1 + .ident.rL.sub.6 (3) L = A-.alpha..beta. A (L * + 1 1-Ro) = L1 +
.ident.t n, (4) where A: main amplifier 13. 140 degree of increase α: 蜜 撮 @ rs, magnification by
16, βr: respective right and left 侑 by 蜜 resistor J9 R, L: output level R1 of main amplifier
13.14: Aαβ rv. Ll: AαβtL. ξr: AαβrγrξL: AαβHt, that is, the output R is a mixture of the
original R channel output R1 and the signal of the opposite (L) channel, which is 87 times the
signal of the opposite channel.
The output is also a component of this-. In this way, in this installation, the volume and balance
of the left and right channels are adjusted, and if necessary, the signal components of the
opposite channels are mixed and broken), and [the main amplifier of each channel is radiated
from the speaker I can break it. Here, the specific effects will be described with reference to ial
and bl in FIG. In FIG. 8, 21 is a speaker, 11, and 19 are original pseudo sound sources,
and 30.31 are pseudo Aoyagi and 32 listeners when this invention is applied. The pseudo blueyellow is a point at which the listener 32 feels that a sound is emitted from that point. Assuming
that only the original signal of the source that has not been introduced into the left and right
channels comes out from the left and right speakers 26.21, the sound source 2g, as shown in (3)
of $ 8j2 The speaker 29 is conditioned to the speaker 26.21. In the case of C, so-called dropout
of sound occurs. If you adjust the 4 resistors xa and xs in J, and mix the signal of the opposite
channel in 1 @ issue of each channel, then the listening ministry will use the speaker 26, I felt 1
# 諒 30.31 in the position that was strange to the inner ring of 21 and 7 like I, M will not miss.
Also, if only the sound @ze of the right @O channel is close to inner 1 as shown in section 118
(bl-1 '), that is, originally a large number of left side signals are included in the left O signal. In
this case, by mixing the right signal with the left a signal, it is possible to move the left signal to
the inside (30 attachment), and it is possible to achieve a good balance. In this way, it is brave to
set the artificial sound source to an arbitrary position, so separation of sound, medium sound of
the sound, and clarification of the previous type is appropriate 1 and always to obtain light
stereo effect can do. As described above, according to the present invention, the signal of each
channel can be mixed arbitrarily with the signal of V vs. any channel, and the position of the
sound source on the auditory sense can be arbitrarily changed. It is possible to provide a sound
volume adjustment device of a stereo amplifier that can obtain a good and clear sound image t
and always exhibit the best stereo effect.