Patent ID: 7321397

Claim:
A color frame identifier circuit, comprising: a pseudo-subcarrier generator circuit configured to receive a reference clock and a first reference signal and generate a pseudo-subcarrier signal at a pseudo-subcarrier frequency based on the reference clock and at a set phase relative to the first reference signal; a color burst slicer circuit configured to slice a color burst signal of a composite video signal at a reference voltage and generate a sliced burst signal; a correlation circuit configured to receive the sliced burst signal and the pseudo-subcarrier signal and generate a burst comparison value for each sliced burst signal; and a processing circuit configured to receive the burst comparison value for each sliced burst signal and generate a color frame identifier signal based on the sliced burst signals; wherein the first reference signal comprises a horizontal sync pulse of a composite video signal comprising a plurality of lines defining a video frame, and the pseudo-subcarrier generator circuit generates the pseudo-subcarrier signal at the set phase relative to the horizontal sync pulse.