Patent ID: 7532252

Claim:
An apparatus including a video signal mode detector, comprising: a signal electrode to convey an input video signal with a video component, a synchronization component with vertical and horizontal subcomponents and including one or both of positive and negative synchronization signal tips, and one or more of a plurality of video signal characteristics that includes a horizontal line count, progressive scanning and interlaced scanning; first detection circuitry coupled to said signal electrode and responsive to said synchronization component by providing a plurality of detection signals at least one of which is indicative of an occurrence of said negative synchronization signal tip; control circuitry coupled to said first detection circuitry and responsive to said plurality of detection signals by providing a detection control signal and one or more first video mode signals; second detection circuitry coupled to said signal electrode and said control circuitry, and responsive to said input video signal and said detection control signal by providing one or more second video mode signals; and third detection circuitry coupled to said control circuitry and said second detection circuitry and responsive to said first and second video mode signals by providing one or more third video mode signals indicative of one or more of said plurality of video signal characteristics.