Video signal processing circuit

Details Video signal processing circuit Video signal processing circuit

1989-03-23

1991-08-20

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358313, H04N 1120

Patent

active

050419048

ABSTRACT:
In a digital video signal processing circuit where digital composite video signals are inputted and processed in separation into a luminance signal and a chrominance signal, the digital video signal processing circuit is provided with a device for separating a first frequency component including a luminance signal in a relatively low region from the digital composite video signals, a device for separating a second frequency component including a luminance signal in the vicinity of a color subcarrier and a chrominance signal, a line comb-shaped filter for separating the second frequency component into the luminance signal in the vicinity of the color subcarrier and the chroninance signal, an adding device for adding the first frequency component and the luminance signal in the vicinity of the color subcarrier, a phase inversion device for inverting the phase of the chrominance signal, and an adding device for adding the chrominance signal in phase inversion to the first frequency component or the luminance signal in the vicinity of the color subcarrier, so that the picture quality of the reproduction image can be improved.

REFERENCES:
patent: 4214263 (1980-07-01), Kaiser
patent: 4241363 (1980-12-01), Maeyami
patent: 4456922 (1984-06-01), Balaban et al.
patent: 4641202 (1987-02-01), Nakamura et al.
patent: 4809060 (1989-02-01), Saeki

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