Logic for matrix systems for reproducing quadraphonic sound

Details Logic for matrix systems for reproducing quadraphonic sound Logic for matrix systems for reproducing quadraphonic sound

1975-03-03

1976-06-29

Olms, Douglas W.

1791004ST, 1791001TD, H04R 500

Patent

active

039670635

ABSTRACT:
Apparatus for decoding four separate channels of information transmitted on two channels or transduced from a medium having only two separate tracks and presenting it on four loudspeakers to give the listener the illusion of sound coming from a corresponding number of separate sources. The realism is enhanced by a decoding matrix which accepts the two outputs from the medium, which may be a stereophonic disc record, separates them into four independent channels each respectively carrying predominantly the information contained in one of the four original recorded sound signals, and, utilizing a logic network which senses the signal amplitudes and phase positions, derives control signals for controlling the gains of amplifiers associated with the four loudspeakers. The logic control circuitry improves the realism of four independent channels by essentially eliminating undesired cross-talk which may accompany the signals produced by the decoding matrix.

REFERENCES:
patent: 3632886 (1972-01-01), Scheiber
patent: 3708631 (1973-01-01), Bauer et al.
patent: 3746792 (1973-07-01), Scheiber
patent: 3821474 (1974-06-01), Ohsawa
patent: 3825684 (1974-07-01), Ito et al.

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