Vertical contour emphasis de-emphasis circuit

Details Vertical contour emphasis de-emphasis circuit Vertical contour emphasis de-emphasis circuit

1985-09-18

1987-03-03

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 5208, H04N 180

Patent

active

046479600

ABSTRACT:
Disclosed is a circuit for emphasizing a video signal in the vertical direction of a television picture for minimizing noise appearing during reproduction. In the circuit, a signal obtained by delaying an input video signal by one horizontal scanning period is positively fed back through a feedback circuit to the input of the input video signal. An amplitude difference signal between the video signal after being fed back through a positive feedback loop and the delayed video signal is produced and added to the input video signal to provide an output video signal.

REFERENCES:
patent: 3836707 (1974-09-01), Murakami et al.
patent: 3978409 (1976-08-01), Dolby et al.
patent: 4388729 (1983-06-01), Spencer et al.
patent: 4403246 (1983-09-01), Thornberry
patent: 4571613 (1986-02-01), Fukuda

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