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:
Dec. 13, 1977
Filed:
Jun. 16, 1976
Applicant:
Inventors:
Thomas E Endres, Kokomo, IN (US);
Donald W Rodeman, Kokomo, IN (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04H / ;
U.S. Cl.
CPC ...
179 / ; 325399 ; 325474 ;
Abstract
A stereo noise reduction circuit is disclosed having circuitry responsive to the automatic gain control voltage generated within an FM stereo receiver for reducing the noise associated with low levels of the RF carrier. A first portion of the noise reduction circuit provides for out-of-phase noise cancellation when the automatic gain control voltage reaches a first level and a second portion provides for rolling-off the higher frequencies of the output audio signals when the automatic gain control voltage reaches a second level.