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:
Sep. 09, 1980
Filed:
Apr. 11, 1979
Yoshihiro Okuno, Tokyo, JP;
RCA Corporation, New York, NY (US);
Abstract
In systems which process frequency modulated carrier waves, such as video disc systems, video tape recorder/playback systems and radio systems, there are occasions where the FM signal suddenly drops to a low level. In the case of FM audio signals, these sudden drops result in objectionable tics and pops in the demodulated audio output. The apparatus described herein reduces these objectionable noises by utilizing a variable impedance in connection with a deemphasis circuit in the main signal path. Upon the occurrence of a signal dropout, a defect indication signal is provided to the variable impedance device. The deemphasis circuit has an overall time constant which includes the variable impedance device and which varies in accordance with the detected signal dropouts so as to provide a substantially smooth demodulated output signal whereby tics and pops, in the output audio signal, are substantially removed.