Video signal processing circuit for eliminating an interfering s

Details Video signal processing circuit for eliminating an interfering s Video signal processing circuit for eliminating an interfering s

1979-04-24

1981-09-22

Moffitt, James W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 36, 358 39, H04N 521, H04N 5785

Patent

active

042913306

ABSTRACT:
A video signal processing circuit eliminates an interfering signal that is included in a video signal, and is especially effective for eliminating an intefering signal that results from reproducing a video signal that is recorded in successive slant tracks on a recording medium, such as magnetic tape. In the video signal processing circuit, a delay line delays at least the luminance component of the video signal by a predetermined number of horizontal line intervals, a first subtracting circuit combines the delayed luminance component with the undelayed luminance component to produce a first difference signal, a limter limits the first difference signal and presents the limited first difference signal to a second subtracting circuit, where the latter signal is subtractively combined with the delayed luminance signal to produce an output signal free of interfering signals. In order to improve the performance of the processing circuit, a high pass filter and an adder circuit can be included to pass the high frequency portion of the first difference signal around the limiter. Alternatively, a deemphasizing circuit and a preemphasizing circuit can be respectively included in advance of, and following, the limiter.

REFERENCES:
patent: 3872498 (1975-03-01), Pritchard
patent: 4003079 (1977-01-01), Woo
patent: 4012774 (1977-03-01), Kuniyoshi et al.
patent: 4052740 (1977-10-01), Coleman, Jr.
patent: 4074321 (1978-02-01), Miller
patent: 4093959 (1978-06-01), Hedlund
patent: 4143396 (1979-03-01), MacKenzie
patent: 4167749 (1979-09-01), Burrus

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