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■ Volume balance adjustment circuit of multi-stereo reproduction apparatus Japanese Patent
Application No. 46-37884 [phase] Application No. 46 (1971) Published on June 2 48-401 @ 昭
48 (1973) January 24 0 Inventor Ito 1 1 0 1 Sansui Denki Co., Ltd. Suginami-ku Izumi 2 Izumi 0
0 applicants Sansui Denki Co. 14 14 1 [phase] agent patent attorney Suginami-ku Izumi Suzue A
detailed description of the invention by 3 outside The present invention relates to a volume
balance adjustment circuit of a multiple stereo reproduction apparatus which converts a twochannel source into a multiple stereo signal of four or more sources to drive a plurality of
speakers. Recently, 4-channel stereo has become a topic, but since the current stereo broadcast is
a 2-channel source [111111], 4-channel stereo effects can be obtained using this 2-channel
source. A so-called matrix method is considered. That is, the matrix 4-channel system produces
each signal of (R + .DELTA.L), (L + .DELTA.R), (R-.DELTA.L), and (L-.DELTA.R) from R and L signals
of 2 channel sources, and four speakers are produced by these signals. Drive. In this case, it is
important to balance the volume of the front and rear speakers, but the separation effect can
only be expected by adjusting the volume balance while keeping the blend constant, and the
circuit configuration is simple. Is desired. The present invention has been made in view of the
above circumstances, and an object of the present invention is to provide a volume balance
adjustment circuit of a multiple stereo reproduction apparatus capable of adjusting the volume
balance before and after while maintaining the blend constant. An embodiment of the present
invention will be described below with reference to the drawings. FIG. 1 shows a circuit in the
case where it is applied to one for converting a two channel source into a four-way stereo signal.
In the figure, FL, FB, RL and RR are speakers arranged on the front left and right, rear left and
right, tl-t'1 is a terminal for extracting L signal of 2 channel source from the amplifier, t2-t'2 is 2
channel source The terminals t1-t'1 and t2 'at one end, for example, t1' and t2 ', are grounded.
Then, the speakers RL and RR are connected in series, one end (speaker RL side) of this series
circuit is grounded via the first volume VR1, the resistor R1, the speaker FL and the resistor R2
in series, and the other end is 2 is grounded via the volume vR2, the resistor R2, the speaker FR
and the resistor R2 'in series. The resistor R3 is connected between the connection point of the
speaker RL and the first volume vR1 and the connection point of the speaker FR1 resistor R2 ',
and the connection point of the speaker RR1 second volume vR2 and the connection point of the
speaker FL, resistance R2 In between the resistance R3 'it [111111] EndPage: