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:
Aug. 13, 1996
Filed:
Oct. 11, 1994
Gopalan Krishnamurthy, Wheeling, IL (US);
Victor G Mycynek, Des Plaines, IL (US);
Gary J Sgrignoli, Mount Prospect, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A dual mode AGC system for a television receiver in which data is in the form of symbols occurring at a fixed symbol rate. The symbols are sent in successive data segments, each having a sync character. Enablement of an AFC Defeat signal defines an initial interval during which the IF gain is maximum. When the AFC Defeat signal becomes inactive, the receiver is operated in a non-coherent mode in which the gain of the IF amplifier is reduced incrementally whenever the IF signal exceeds a clipping level for a period of eight successive symbol clocks. Upon a segment sync lock condition occurring, a normal coherent mode is entered in which the AGC responds to a signal characteristic, i.e. data segment sync. The rate of gain change available in the non-coherent mode-is much greater than that in the normal coherent mode.