Multichannel record disc reproducing system

Details Multichannel record disc reproducing system Multichannel record disc reproducing system

1975-09-12

1976-11-09

Canney, Vincent P.

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

Patent

active

039912833

ABSTRACT:
A multichannel record disc reproducing system comprises a circuit for demodulating an angle-modulated wave picked up from a multichannel record disc. A circuit detects abnormal phenomena of the angle-modulated wave, whereupon an expansion circuit accomplishes a variable control operation. A middle frequency band and/or a high frequency band component of the demodulated signal is attenuated in accordance with the level thereof. A circuit is operated in response to the output of the detection circuit to stop a variable expansion control operation of the expansion circuit and imparts a specific attenuation characteristic to a signal passing through the expansion circuit.

REFERENCES:
patent: 3564434 (1971-02-01), Camenzino et al.
patent: 3686471 (1972-08-01), Takahashi
patent: 3839602 (1974-10-01), Takahashi
patent: 3843850 (1974-10-01), Takahashi et al.

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