Circuit for judging the existence of television image signals

Details Circuit for judging the existence of television image signals Circuit for judging the existence of television image signals

1994-11-08

1997-04-15

Peng, John K.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348533, H04N 508

Patent

active

056214758

ABSTRACT:
The present invention provides a more reliable circuit for judging the existence of television image signals. A circuit for judging the existence of television image signals by counting the number of edges of the synchronous signals of a composite synchronous signals for a certain period, and judging the existence of TV image signals, wherein a mask timer circuit which masks signals generated following the synchronous signals for a certain period after the composite synchronous signal is detected, is installed before a synchronous counter.

REFERENCES:
patent: 4614973 (1986-09-01), Sorenson
patent: 4620312 (1986-10-01), Yamashita
patent: 4763341 (1988-08-01), Murphy
patent: 5034815 (1991-07-01), Shibayama

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