Abnormal sound eliminating system in record disc reproducing app

Details Abnormal sound eliminating system in record disc reproducing app Abnormal sound eliminating system in record disc reproducing app

1974-07-17

1976-03-09

Konick, Bernard

1791004E, H03D 318, G11B 304, H03D 324

Patent

active

039433030

ABSTRACT:
In a record disc reproducing apparatus, an abnormal sound eliminating system comprises a variable filter in the transmission system for a signal reproduced from a record disc. The filter does not pass the signal band, which is variable. A control signal generator produces a control signal in accordance with the frequency of a carrier wave reproduced from a multichannel record disc. The non-passed signal band of the variable filter is variably controlled by the control signal from the control signal generator, to eliminate a carrier wave reproduced with a frequency lower than a specific frequency. This low frequency wave appears when the multichannel record disc rotates at a low speed, less than a specific normal rotational speed. This limitation prevents the generation of abnormal sound due to the reproduced carrier wave of low frequency.

REFERENCES:
patent: 2559902 (1951-07-01), Scott
patent: 3843850 (1974-10-01), Takahashi et al.
patent: 3854098 (1974-12-01), Takahashi et al.

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