Video chroma signal processing circuit

Details Video chroma signal processing circuit Video chroma signal processing circuit

1991-11-05

1993-03-09

Dwyer, James L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 40, 358 39, H04N 977

Patent

active

051929961

ABSTRACT:
A video chroma signal processing circuit in which a composite video signal, formed of an analog luminance signal and an analog chrominance signal, is separated into Y and C components and converted into digital codes by AD converters and processed by processing circuits. The outputs of the processing circuits are converted into analog signals again with DA converters to produce a picture image; wherein, it is intended to obtain a wide band of a luminance signal by making efficient use of an AD converter for a chrominance signal and to improve horizontal resolution. The apparent sampling frequency is doubled by sampling the AD converter for a chrominance signal with a phase reverse to that of an AD converter for a luminance signal so as to improve the horizontal resolution of the luminance signal.

REFERENCES:
patent: 4219838 (1980-08-01), Rossi
patent: 4386434 (1983-05-01), Gibson et al.
patent: 4456922 (1984-06-01), Balaban et al.
patent: 4991003 (1991-02-01), Sendelweck
patent: 5081537 (1992-01-01), Itou

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