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:
Oct. 27, 1987
Filed:
May. 16, 1984
Frederick H Auld, Jr, Wheeling, IL (US);
David L Walker, Arlington Heights, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A non-linear sync signal processor for deriving a sync-like signal from video information with suppressed sync signals includes a differentiating circuit for deriving pulse potentials from the leading and trailing edges of suppressed sync signals, a pair of comparators for generating signals corresponding to the pulse potentials and a pair of non-retriggerable monostable timers, one for creating a 6 microsecond first window in response to a leading edge and the other for creating a 58 microsecond second window in response to a trailing edge occurring in the first window. The second timer is enabled by operation of the first timer and the first timer is inhibited during operation of the second timer. Thus only sync-like signals having three characteristics of conventional sync signals are regenerated.