Digital aft system which is activated during vertical...

Details Digital aft system which is activated during vertical... Digital aft system which is activated during vertical...

H - Electricity

04

N

365/14, 350/87

H04N 5/50 (2006.01) H03J 7/06 (2006.01)

Patent

CA 1203330

-52- RCA 74119/78780 ABSTRACT OF THE DISCLOSURE A digital fine tuning system for a television receiver includes a counter (30) arrangement for measuring the frequency of the IF picture carrier by counting cycles of the IF picture carrier during a measurement interval and comparing the count at the end of the measurement interval to a predetermined count related to the nominal frequency of the IF picture carrier. To prevent counting, and thereby frequency measurement errors, due to the overmodulation of the picture carrier during image intervals, the frequency measurement operation is enabled during a predetermined portion of the vertical retrace interval when the picture carrier is not overmodulated.

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