Patent ID: 6559891
Filing Date: 2003-05-06
Classification: H04N

Abstract:
A method of generating tri-level video synchronization pulses, comprising:detecting an End-Active-Video signal; responsive to detecting the End-Active-Video signal, generating a blanking signal output until a horizontal synchronization signal is received; upon receipt of the horizontal synchronization signal, generating a tri-level low signal output until the end of the horizontal synchronization signal is detected; upon detecting the end of the horizontal synchronization signal, generating a tri-level high signal output and starting a pixel counter; upon counting a predetermined number of pixel times, generating a blanking signal; detecting a start-of-video signal; upon detecting the Start-Active-Video signal, inspecting for a video synchronization signal; and if the inspecting determines a lack of a vertical synchronization signal, passing an analog video output until detection of a next End-Active-Video signal.