Multichannel record disc reproducing system and apparatus

Details Multichannel record disc reproducing system and apparatus Multichannel record disc reproducing system and apparatus

1974-03-06

1976-02-03

Konick, Bernard

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

Patent

active

039366189

ABSTRACT:
A multichannel record disc reproducing system and apparatus comprises a phase-locked loop for demodulating an angle-modulated wave signal in a multiplexed signal picked up from a multichannel record disc. A synchronous detector compares the phases of the angle-modulated wave signal and an output signal of a voltage-controlled oscillator in the phase-locked loop. The detector produces an output signal when there is a noise component in the angle-modulated wave signal. A circuit, controlled by the output of the synchronous detector, provides a demodulated output signal having at least one attenuated frequency band, in which a noise component is greatly reduced.

REFERENCES:
patent: 3209271 (1965-09-01), Smith
patent: 3371281 (1968-02-01), Powell
patent: 3686471 (1972-08-01), Takahashi
patent: 3778728 (1973-12-01), Napp

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