Discrete four-channel disc reproducing system

Details Discrete four-channel disc reproducing system Discrete four-channel disc reproducing system

1975-03-10

1977-01-04

Cardillo, Jr., Raymond F.

179 1GQ, 1791001TD, 1791004M, G11B 300, G11B 378

Patent

active

040015181

ABSTRACT:
A compatible discrete four-channel (CD-4) stereophonic reproducing system which comprises a detecting circuit for detecting a sub-channel signal. A control means detects an over-deviation of the sub-channel signal and deactivates a noise elimination switching circuit connected in a stage following the detecting circuit when the over-deviation signal appears, thereby preventing an output from being transmitted from the detecting circuit to succeeding stages. A distortion reducing circuit is also provided. This circuit is responsive to an output of said control means for attenuating at least a high frequency band of an output of the switching circuit for a predetermined time period, this period being longer than the period for which the over-deviation signal appears. Consequently, the noise produced by various causes can be effectively eliminated.

REFERENCES:
patent: 3843850 (1974-10-01), Takahashi et al.
patent: 3854098 (1974-12-01), Takahashi et al.
patent: 3894201 (1975-07-01), Pyles
patent: 3896272 (1975-07-01), Takahashi et al.
patent: 3911231 (1975-10-01), Sugimoto et al.
patent: 3911232 (1975-10-01), Itoh

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