Multichannel record disc reproducing system

Details Multichannel record disc reproducing system Multichannel record disc reproducing system

1976-09-22

1978-06-20

Konick, Bernard

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

179 1GQ, 1791001TD, 329122, G11B 374, H03D 300

Patent

active

040963608

ABSTRACT:
A multichannel record disc reproducing system comprises at least two phase-locked loops. Each loop includes a phase comparator and a voltage-controlled oscillator for respectively demodulating an angle-modulated signal which is separated from a signal picked up from a multichannel record disc. The picked up signal includes a direct-wave signal and an angle-modulated signal which were multiplexed and recorded. An addition circuit adds the demodulated output signals of the phase-locked loops. The respective phase-locked loops have different lock ranges in order to exclude noise and other distortion.

REFERENCES:
patent: 3746993 (1973-07-01), Ahmed
patent: 3772467 (1973-11-01), Ohwaki
patent: 3911232 (1975-10-01), Itoh
patent: 3936618 (1976-02-01), Takahashi
patent: 3983500 (1976-09-01), Takahashi

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