Video noise reduction system with signal emphasis preceding FM m

Details Video noise reduction system with signal emphasis preceding FM m Video noise reduction system with signal emphasis preceding FM m

1987-03-30

1989-01-31

Cardillo, Raymond F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358327, 358334, 358340, 360 331, H04N 981

Patent

active

048020168

ABSTRACT:
A video noise reduction system for use in a video signal recording apparatus adapted to record red, blue and green primary color component video signals on a plurality of separate tracks of a magnetic recording medium. The component video signals are applied to a matrix circuit which produces a wide-band luminance signal. The video noise reduction system includes a band splitter circuit for splitting the wide-band luminance signal into an upper-band luminance signal and a lower-band luminance signal and an emphasis circuit for emphasizing the low level components of the upper-band luminance signal before the upper-band luminance signal is FM modulated. Since the emphasis circuit follows the band splitter circuit having a flat phase versus frequency characteristic, the video noise reduction circuit can reduce video noise without causing distortion of the frequency modulated video signal.

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"Operational Amplifiers Design and Applications", by Jerald G. Graeme et al., 1971, pp. 251-258.

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