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:
Jun. 12, 1984
Filed:
Dec. 09, 1981
Liston Abbott, East Windsor, NJ (US);
RCA Corporation, New York, NY (US);
Abstract
A decoder for reconstructing a standard composite video signal with standard synchronizing pulses from a video signal V with only gray sync encoding E.sub.GS, of a repetition rate f.sub.GS, and comprising a first generator for generating a signal E.sub.VCO having a controllable frequency f.sub.VCO which, in the absence of frequency control, is slightly different from f.sub.GS, a second generator responsive to E.sub.VCO to form a composite blanking signal E.sub.B having a repetition rate equal to f.sub.VCO so that E.sub.B will slew with respect to E.sub.GS until E.sub.B and E.sub.GS become synchronized and a summer for summing E.sub.B and V to produce a reconstructed standard composite video signal when E.sub.B and E.sub.GS become synchronized. There is further provided a phase lock circuit for phase locking E.sub.VCO with the standard synchronizing pulses of said reconstructed video signal to maintain E.sub.B and E.sub.GS in a synchronized relationship.