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. 09, 2011
Filed:
Mar. 20, 2007
David Wang, Richmond Hill, CA;
Clarence Ip, Toronto, CA;
Simpson Lam, Richmond Hill, CA;
Harris Canada Systems, Inc., Toronto, CA;
Abstract
A system and method for correcting so-called 'lip sync' errors is provided, using a synchronization test signal comprising a video signal including a colorbar signal that is periodically interrupted by a series of consecutive defined black frames and an audio signal comprising a tone periodically interrupted by a period of silence beginning at the same time as the first of the series of consecutive defined black frames. The synchronization test signal is configured to survive encoding, decoding, conversion, and compressing processes used in a typical digital broadcast system environment and thus provide a means of measuring the relative audio and video timing of a processed signal. A method for correcting lip sync error receiving the synchronization test signal and comparing the relative timing of the video and audio portions of the synchronization test signal to their original relative timing, and delaying either the audio or video portions of a broadcast signal according to the timing comparison derived from the received test signal.