System for recording and/or reproducing four channel signals on

Details System for recording and/or reproducing four channel signals on System for recording and/or reproducing four channel signals on

1976-09-07

1977-08-16

Cardillo, Jr., Raymond F.

179 1GQ, 179 15BT, 1791001TD, 1791004M, G11B 300, G11B 374, H04B 500

Patent

active

RE0293601

ABSTRACT:
This system records four channel signals on or reproduces them from a record disc. The four channel signals are combined into sum signals and difference signals, respectively, each composed of two signals. Each difference signal is converted into an angle modulated wave by modulating a carrier from a single oscillator and is multiplexed with each sum signal. The four channel signals picked up from the record disc are reproduced and sounded respectively from four speakers placed at predetermined positions.

REFERENCES:
patent: 2281405 (1942-04-01), Barrish et al.
patent: 2349886 (1944-05-01), Roberts
patent: 2874221 (1959-02-01), Dauguet
patent: 3067292 (1962-12-01), Minter
patent: 3401237 (1968-09-01), Takayanagi
Reference Data for Radio Engineers, 5th Ed., Modulation 21-11 thru 21-13, 1968 (supplied by applicant in parent case).
News for the Audiophile, Burstein, Radio Electronics, 4/58, pp. 38-39.

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