Apparatus and method for processing a nonstandard sync signal in

Details Apparatus and method for processing a nonstandard sync signal in Apparatus and method for processing a nonstandard sync signal in

1996-12-20

1999-04-06

Harvey, David E.

Facsimile and static presentation processing

Facsimile

Picture signal generator

386 90, 386 47, 386124, H04N 595

Patent

active

058925937

ABSTRACT:
There is disclosed a nonstandard sync signal processing apparatus for a video signal processing system, including: a signal separator separating a composite sync signal of a video signal into horizontal and vertical sync signals; a horizontal period counter counting a clock signal for a given horizontal period and producing a processed horizontal sync signal; a vertical period counter counting a clock signal for a given vertical period and producing a processed vertical sync signal; an error detector detecting if an error occurs in the separated horizontal sync signal by comparing it with the processed horizontal sync signal, and detecting if an error occurs in the separated vertical sync signal by comparing it with the processed vertical sync signal; a first data converter converting the video signal of a period prior to where the erroneous horizontal sync signal occurs into corresponding digital data if the error detector determines that the horizontal sync signal is erroneous; and a second data converter converting the video signal of a horizontal period prior to where the erroneous vertical sync signal occurs, into corresponding digital data if the error detector determines that the vertical sync signal is erroneous.

REFERENCES:
patent: 4729025 (1988-03-01), Yanase

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