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DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a # -balance
balance circuit of a multiple stereo reproduction apparatus which drives two or more speakers by
converting it to a two-channel source multi-source stereo signal of four or more sources. 媛, 4channel stereo is #kJ 111 and it is 1- but now, because the stereo shoot is dry with 2 channel
north, this 2 channel source is for 71. . 4 channel stereo W center + gain S. The so-called matrix
is considered to be an equation. 8. The matrix four-channel system has two channel sources fL
and L signals, and eight. The four speakers are driven by the L signal t7T difference signal. In this
case, it is important to take the # vague balance of the front and rear speakers. The present Jt
bulk has been made in consideration of the above-mentioned circumstances, and is intended to
provide a volume balance II4 circuit of a multiple stereo reproduction apparatus which can
simply and easily change the volume balance before and after. The 0 section is an illustration of
an embodiment of the heavy entanglement shown in Fig. RMt. The 0 section shows a circuit in
the case where the present invention is applied to a 2-channel source 4-way stereo signal. , Fb, F
*. R1- and am are speakers arranged on the front left and right, rear left and right, "@" + 'is a 2channel source L signal to the left---> terminal, 1-1-"71 & attractive angle 3 -2 at the terminal of
the channel source of the channel source, the terminal tl-1 l 'at 18, 1 chapter 1-t, if one wist of l
1'. The power stations are each steeped. Thus, the speaker RL is connected to the R * f # row, one
end (speaker RL side) of this series circuit is grounded via the first polysilicon VR,% and the
speaker FL, and the other end is connected to the second volume Go through VR and speaker F
true. 1 l IJ period. -Force Rh, R to the true 4 瘤, through the first blend resistor Rbl, the speaker
PL, F true # 1 (volume VR, Vh, (111i) 1151 m $ 217) blend resistor Rh, Connect In addition, the
terminal 11. 1 of snow on the terminal 11. The first one. The second Polyum r * vR * works in
tandem. So-called two different volumes, 1j, 4% in the direction shown by the arrow shown in the
figure or in the opposite direction. In the case of the wax wax balance circuit according to the
present invention thus constructed, the rear speakers RL and RII are driven in series reverse
phase by the signal イ and 十 -L and the signal 1/1 // F4 EE anti Rb1 The IIIA is also moved by
the blend signal according to the front speaker PL.
F1 is driven by the blend resistance and signals including fL, jL added through h8, i.e., L + [Delta]
R, B + L, respectively. Then, by operating the snow to the first, $ 2 volume Va ,, V, 44 pairs of
vignetting balances of the speakers PL, Fl and the rear speakers RL, R wing are selected. In this
case, the blending habit is kept substantially constant in the sandwich at range. In addition, the
blend resistance Rh of @ 1, 4 [L if not, the rear speaker RL. The RIA is decimated by the
difference signal L-8 of M or R signal, or the second blend resistance fLb, and the front speaker
F1 is an L signal if it is not a gun. 1 is respectively driven by the overhead signal. As described
above, the calibration balance and the compensating circuit according to the fourth aspect of the
present invention, the left and right rear speakers RL, am in series to! W way! Connect the series
circuit of the left and right speakers PL, F お よ between the other end and the blend resistance
as a temporary example and connect two channel sources to the slider and a signal I Therefore, it
is possible to make a simple circuit configuration by the two slow volumes and the blend if, and
to keep the blend substantially constant while having a narrow adjustment range. In the above
embodiment, tQ has been described for the case of using only two channel stereo signals with
four channels, but it is also possible to convert multiple stereo signals of six or more sources. Of
course, various modifications can be made without departing from the scope of the invention.
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