The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 1976
Filed:
Jul. 17, 1974
Isao Masuda, Sagamihara, JA;
Masami Yamazaki, Zama, JA;
Victor Company of Japan, Ltd., Yokohama, JA;
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.