Decoder for quadraphonic playback

Details Decoder for quadraphonic playback Decoder for quadraphonic playback

1975-09-25

1977-04-19

Olms, Douglas W.

1791004ST, H04R 500

Patent

active

040189929

ABSTRACT:
Quadraphonically encoded left end right signals are fed to separate left and right signal phase shifters the outputs of which are fed to three variable gain amplifiers for each of the four corner loudspeakers of a quadraphonic playback system and also to three comparators which function to control operation of the variable gain amplifiers in such manner as to cancel cross talk by altering the decoding coefficients of the cross talk bearing channels.

REFERENCES:
patent: 3708631 (1973-01-01), Bauer et al.
patent: 3772479 (1973-11-01), Hilbert
patent: 3821471 (1974-06-01), Bauer
patent: 3864516 (1975-02-01), Kameoka et al.
patent: 3919480 (1975-11-01), Fukami
patent: 3943287 (1976-03-01), Gravereaux et al.
patent: 3944735 (1976-03-01), Willcocks

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