Adaptive synchronizing signal separator

Details Adaptive synchronizing signal separator Adaptive synchronizing signal separator

1994-12-06

1996-11-19

Metjahic, Safet

Television

Synchronization

Sync separation

348500, 375354, H04N 504

Patent

active

055767702

ABSTRACT:
A digital clamp combines a digitized luminance signal with a DC offset to clamp the back porch portions of the luminance signal to a predetermined IRE level. The clamp generates a reference signal having successive values indicative of successive IRE levels of the back porch portions prior to being clamped. A summer generates successive slice level values indicative of successive averages of the reference signal values and a fixed value. A limiter restricts the successive slice level values to a range of slice levels. A comparator generates a composite synchronizing signal by comparing the luminance signal to the successive slice level values, as limited.

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ITT Semiconductors, VSP 2860 Video/Snyc Processor, 3.6 Sync Processing and Deflection, Edition Dec. 1, 1989, 6251-310-2E, p. 21.

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