Apparatus and method for processing nonstandard sync signal in video signal processing system

摘要

There is disclosed a nonstandard sync signal processing apparatus for a video signal processing system, including: a signal separator (100) separating a composite sync signal of a video signal into horizontal and vertical sync signals; a horizontal period counter (210) counting a clock signal for a given horizontal period and producing a horizontal value; a vertical period counter (220) counting a clock signal for a given vertical period and producing a vertical value; an error detector (230) detecting if an error occurs in the horizontal sync signal by comparing it with the horizontal value, and detecting if an error occurs in the vertical sync signal by comparing it with the vertical value; a first data converter (270) converting the video signal of a period prior to where the erroneous horizontal sync signal occurs into corresponding digital data if the error detector (230) determines that the horizontal sync signal is erroneous; and a second data converter (270) converting the video signal of a horizontal period prior to where the erroneous vertical sync signal occurs, into corresponding digital data if the error detector (230) determines that the vertical sync signal is erroneous.