VERTICAL_SYNC_SEPARATOR

Published:2009/7/15 21:58:00 Author:Jessie | From:SeekIC

Arrangement uses controlled clocking sequence of JK flip-flop to detect presence of vertical sync interval in standard EIA television composite sync wave-form. Complementary sync waveforms J and K are fed to J and K inputs of 7473 flip-flop, which is clocked by 1-μs pulse that is delayed slightly longer than 10-μs horizontal sync interval. First clock pulse after 11-sμ interval changes flip-flop output Q to 1, where it stays for six clock periods before reverting to 0 state after vertical sync interval has passed.-W. G. Jung, Vertical Sync Separator Has No Integrating Network, EDN Magazine, Oct. 15, 1972, p 57.



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