Document Type and Number:
Japanese Patent JPS4890705
Kind Code:
A
Abstract:
In a four-channel stereophonic sound reproducing system, there are provided a decoder matrix circuit connected to receive composite two channel signals containing four-channel original signals, for producing four-channel reproduced signals, means for producing a sum of the signals of two adjacent channels among the outputs from the decoder matrix circuit, means for comparing the levels of the outputs from the sum producing means and means for attenuating to a zero the level of the reproduced signals of adjacent channels carrying low level signals in accordance with the output of the comparator means.
Application Number:
JP2274772A
Publication Date:
November 27, 1973
Filing Date:
March 07, 1972
Export Citation:
International Classes:
H04H20/89; H04S3/02; (IPC1-7): H04R5/00