US 7,321,397 B2
Composite color frame identifier system and method
Nigel James Seth-Smith, Lymington (United Kingdom)
Assigned to Gennum Corporation, (Canada)
Filed on Sep. 08, 2004, as Appl. No. 10/935,875.
Claims priority of provisional application 60/502036, filed on Sep. 10, 2003.
Claims priority of provisional application 60/501792, filed on Sep. 10, 2003.
Claims priority of provisional application 60/502028, filed on Sep. 11, 2003.
Claims priority of provisional application 60/502128, filed on Sep. 11, 2003.
Prior Publication US 2005/0052575 A1, Mar. 10, 2005
Int. Cl. H04N 5/08 (2006.01)
U.S. Cl. 348—527  [348/505; 348/194; 348/508] 19 Claims
OG exemplary drawing
 
1. 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.