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. 02, 2001
Filed:
Sep. 23, 1997
Ivan W Y Yang, Markham, CA;
ATI Technologies, Inc., Thornhill, CA;
Abstract
A method and apparatus for detecting validity of video transmissions in accordance with one of a plurality of channel identification plans is be accomplished by first detecting selection of a channel, wherein the channel corresponds to a particular video transmission. The signal strength of the video transmission is then tested over a frequency range relating to the channel. When the signal strength of the video transmission at a particular frequency exceeds a threshold, a video tuner utilizes the frequency to detect the video transmission. Upon detecting the video transmission, the video tuner outputs a base band signal of the video transmission to a video decoder. The video decoder converts the base band signal into a digitized video, which is checked to determine whether it includes a synchronization signal. If the digitized video includes a synchronization signal, the video transmission is deemed to be valid, i.e., it is in accordance with one of the plurality of channel identification plans. If, however, the digitized video does not include the synchronization signal or the signal strength at each of the frequencies of the frequency range did not exceed the threshold, the video transmission is deemed to be invalid, i.e., it is not in accordance with any of the channel identification plans.