Multichannel record disc reproducing apparatus

Details Multichannel record disc reproducing apparatus Multichannel record disc reproducing apparatus

1977-10-20

1980-01-29

Konick, Bernard

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

Patent

active

041862813

ABSTRACT:
A multichannel record disc reproducing apparatus comprises a first phase locked loop circuit including a phase comparator and a voltage controlled oscillator for demodulating an angle-modulated wave signal. The modulated signal is separated from a composite signal picked up from a multichannel record disc on which a multiplexed direct wave signal and an angle-modulated wave signal are recorded. The output of the first phase locked loop is a demodulated signal. A second phase locked loop circuit includes a phase comparator and a voltage controlled oscillator, supplied with the separated angle-modulated wave signal and having a lock range of a width which covers and is wider than the maximum lock range width of the first phase locked loop circuit. A synchronous detector compares the phases of the angle-modulated wave signal and the output signal of voltage controlled oscillator of the second phase locked loop. The synchronous detector operates when the phase difference of the two signals deviates sufficiently from a predetermined phase difference. Means are provided for reducing or removing noise components which are developed in the demodulated signal in accordance with the output of the synchronous detector. This noise reduction or removal is provided in the first phase locked loop circuit and/or in a channel for transmitting the demodulated signal.

REFERENCES:
patent: 3896272 (1975-07-01), Takahashi et al.
patent: 3909735 (1975-09-01), Anderson et al.
patent: 3934087 (1976-01-01), Takahashi et al.
patent: 3936618 (1976-02-01), Takahashi et al.
patent: 3991283 (1976-11-01), Itoh et al.
patent: 4096360 (1978-06-01), Takahashi et al.

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