Multichannel record disc recording system

Details Multichannel record disc recording system Multichannel record disc recording system

1974-04-22

1976-04-27

Konick, Bernard

179 1GQ, 1791001TD, G11B 300, G11B 374

Patent

active

039536866

ABSTRACT:
A multichannel record disc recording system comprises automatic gain control circuits for each of the multichannels a control voltage, representing the phases and levels of the multichannel signals, control the gain of the automatic gain control circuits. An operational circuit at the output of the automatic gain control circuits produces an output sum signal and a difference signal. The difference signal, is angle modulated and multiplexed with the sum signal. The resulting multiplexed signal is recorded on a record disc. Each of the automatic gain control circuits carries out a gain control operation so that the maximum level of the output sum signal does not exceed a predetermined level, and the maximum level of the output signal of the automatic gain control circuit exceeds one half of the predetermined level.

REFERENCES:
patent: 3686471 (1972-08-01), Takahashi
patent: 3772479 (1973-11-01), Hilbert
patent: 3839602 (1974-10-01), Takahashi
"4-Channel Matrix How Good Is It?" by Walters Radio-Electronics Mar. 1973 pp. 35-38.

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