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Primary Examiner: Claffy, Kathleen H.
Assistant Examiner: Chayt, Kenneth A.
Attorney: Fitch, Even & Tabin

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Title: Multichannel matrix logic and encoding systems

Abstract: Apparatus and methods relating to "quadrasonic" encoding and decoding systems, including synthetic supplementary channel systems, matrix logic systems, and systems employing stereo compatible matrix variations.

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Inventors: Cooper, Duane P. (Champaign, IL, US)

Application Number: 836507
Filing Date: 1977-09-26
Publication_date: 1979-05-01
Assignee:
Primary Class(es): 381/21
Other Classes:
US Patent Ref:

3824621	Jul, 1974	Suzuki	179/1.
3932706	Jan, 1976	Takahashi et al.	179/100.
3979564	Sep, 1976	Cho	179/1.

Other Refs: Other References: "Principles of Coherent Communication", Andrew Viterbi, (McGraw Hill, Inc.) 1966, pp. 196-197.
"Four Channels and Compatibility", Peter Scheiber, Journal of the Audio Eng. Soc., vol. 19, No. 4, 4/1971, pp. 267-279.