Comb filter method and apparatus for chrominance and luminance s

Details Comb filter method and apparatus for chrominance and luminance s Comb filter method and apparatus for chrominance and luminance s

1988-03-31

1989-09-05

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 978

Patent

active

048643890

ABSTRACT:
An improved comb filter extracts at least one of chroma and luminance from a quadrature modulated subcarrier color television input signal. The described method implemented by the described apparatus includes the steps of delaying the input signal through a plurality of predetermined delay periods wherein the duration of each delay period is related to line scan period or picture frame period, filtering the undelayed and delayed signals so that energy components of the input signal lying in the vicinity of the chroma subcarrier frequency are passed, thereby providing bandpass filtered undelayed and delayed signals, detecting amplitude and sense of periodic transitions lying in the chroma energy passband, multiplying two of the undelayed and delayed signals by the continuously variable coefficients to produce an error correction signal corresponding substantially to the following approximation:

REFERENCES:
patent: 4456922 (1984-06-01), Balaban et al.
patent: 4562460 (1985-12-01), Harwood
patent: 4688080 (1987-08-01), Wagner

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