Vertical aperture correction circuit

Details Vertical aperture correction circuit Vertical aperture correction circuit

1978-04-18

1979-07-03

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358162, H04N 514

Patent

active

041602650

ABSTRACT:
A video signal processing circuit, particularly for use in conjunction with a single-tube indexing color television camera, provides an output video signal to which a vertical aperture correction has been added, and which cancels undesired line-to-line amplitude changes, thereby preventing line-crawling distortion. The video signal processing circuit includes an input circuit to which an input video signal is supplied, a delay circuit for delaying the input video signal from the input circuit by one horizontal scanning interval, a signal squaring circuit for squaring the difference in level between the input video signal and the delayed input video signal, and a mixing circuit for combining the input video signal with the squared signal output from the squaring circuit. The squaring circuit can include a multiplier circuit, or a square-law characteristic FET, to which the difference in level between the delayed and undelayed input video signals is applied. Alternatively, the squaring circuit may include a multiplier FET to which the delayed and undelayed input video signals can be directly applied.

REFERENCES:
patent: 3946152 (1976-03-01), Illetschko et al.
patent: 4086618 (1978-04-01), Koubek

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