Sync separator with a lock-ahead clamp

Details Sync separator with a lock-ahead clamp Sync separator with a lock-ahead clamp

H - Electricity

04

N

350/85

H04N 5/04 (2006.01) H04N 5/08 (2006.01)

Patent

CA 1126861

-11- ABSTRACT OF THE DISCLOSURE An apparatus and method for precise separation of synchronizing information from a color television signal is described. Synchronizing signals are separated from the input video and used in a sample-and-hold circuit as the sampling pulses. The input video is sampled during the duration of the sync pulse. The sample is inverted and fed to a summing point where it is summed with a delayed version of the input video. A null is produced at the summing point during the duration of the input sync pulse. Since the input video to summing point has been delayed, the clamp null at the summing point begins during the front porch of the horizontal line interval allowing the leading edge of sync to be picked off very accurately by a sync separating comparator.

342166

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