Digital pulse filtering circuit

Details Digital pulse filtering circuit Digital pulse filtering circuit

1997-06-16

1999-09-14

Peng, John K.

Television

Synchronization

Sync separation

348526, 348529, 348531, 348513, H04N 508, H04N 510

Patent

active

059530707

ABSTRACT:
A digital pulse filtering circuit for processing composite sync signals is provided. The digital pulse filtering circuit can determine the polarity of an input composite sync signal composed of a horizontal sync signal and a vertical sync signal. The horizontal sync signal is a first periodic pulse train having a first pulse width, while the vertical sync signal is a second periodic pulse train having a second pulse width. The digital pulse filtering circuit includes a horizontal sync filter for filtering out all pulses in the input composite sync signal that have a pulse width less than the pulse width of the horizontal sync signal; and a vertical sync filter, coupled to receive the output of said horizontal sync filter, for filtering out all pulses in the output of said horizontal sync filter that have a pulse width less than the pulse width of the vertical sync signal. The output of said indicating the polarity of the input composite sync signal. A polarity output circuit is used to output the input composite sync signal in a polarity in accordance with the composite-sync polarity signal.

REFERENCES:
patent: 5296928 (1994-03-01), Yamashita
patent: 5349387 (1994-09-01), Fan Chiang
patent: 5754250 (1998-05-01), Cooper
patent: 5790200 (1998-08-01), Tsujimoto

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