Patent ID: 6337682
Filing Date: 2002-01-08
Classification: G09G,H03L

Abstract:
An apparatus, comprising:a video display conveying varying visual information to a user; a first clock unit receiving a second synchronous signal corresponding to a first synchronous signal, said first clock unit generating a first clock signal with a frequency corresponding to said second synchronous signal; a comparator receiving delay data and receiving phase difference data corresponding to a phase difference detected between said first clock signal and said second synchronous signal, comparing said delay data with said phase difference data, and outputting a correction signal in dependence upon said comparing; a control unit receiving said correction signal from said comparator and receiving said first synchronous signal, said control unit outputting said delay data to said comparator, said control unit performing one of increasing a frequency divisional value and decreasing said frequency divisional value, said increasing of said frequency divisional value and said decreasing of said frequency divisional value corresponding to an adjustment of said frequency of said first clock signal in response to said correction signal, said control unit outputting said second synchronous signal to said first clock unit; and a converter converting a received analog video signal into a corresponding digital video signal in response to said first clock signal, said digital video signal corresponding to the visual information.