Centre channel derivation for stereophonic cinema sound

Details Centre channel derivation for stereophonic cinema sound Centre channel derivation for stereophonic cinema sound

H - Electricity

04

R

352/71, 179/9

H04R 5/04 (2006.01) H04S 3/00 (2006.01)

Patent

CA 1038773

ABSTRACT In a stereophonic reproduction system,especially for a cinema, a centre channel signal is derived by combining left and right channel signals. In order to harden the centre image, particularly in speech, the left and right channel signals are compared and, when they include significant amount of correlated information, the relative gain of the centre channel is enhanced by boosting the gain of that channel and/or cutting the gain of the left and right channels. The test for correlation of information is preferably restricted to speech frequencies and the enhancement of relative gain may be performed only at middle frequencies. -1-

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