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:
Apr. 12, 1988
Filed:
May. 09, 1986
Yoshiro Sugai, Saitama, JP;
Hiroyuki Kimura, Saitama, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
In a sound multiplex television tuner, when the input field strength becomes smaller than a certain value, a level control means continuously attenuates the sub signal demodulation output with the aid of the field strength detection signal which a field strength detector circuit provides according to the input field strength. The characteristic of response to input field strength of the level control means is switched, according to a given sound multiplex mode, so that its operation becomes most suitable for the sound multiplex mode, thereby to suppress the noise without causing the television viewer to feel a sense of incongruity in the perceived sound.