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. 28, 1993
Filed:
Nov. 12, 1991
Paul M Gosc, Buffalo Grove, IL (US);
Manish Pradhen, Rolling Meadows, IL (US);
Khosro M Rabii, Arlington Heights, IL (US);
Zenith Electronics Corporation, Glenview, US;
Abstract
A method of operating a multi-standard noise immune sync pulse recovery system establishes a time window during which a sync pulse is expected. The count of a counter is stored when a sync pulse occurs as expected, the counter is reset and a sync output is generated. Successive sync pulses occurring as expected are verified by comparison with the stored counts. When a first predetermined number of successive sync pulses occur as expected, a state of periodicity is established for the signal. The window is progressively narrowed to optimize the system noise immunity responsive to a second predetermined number of sync pulses occurring as expected. Sync outputs are generated in the place of expected sync pulses that do not occur during the window when the system is in the state of periodicity. The state of periodicity is lost when a third predetermined number of sync pulses do not appear as expected and the window is progressively widened.