Adaptive comb filter for separating at least one component of a

Details Adaptive comb filter for separating at least one component of a Adaptive comb filter for separating at least one component of a

1990-07-31

1992-03-03

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 964

Patent

active

050937154

ABSTRACT:
An adaptive comb filter for separating at least one component of a video signal includes a filter input terminal for receiving the video signal, a first delay device for delaying the video signal by a first interval to produce a first delayed video signal, a second delay device for delaying the video signal by a second interval to produce a second delayed video signal, a first signal subtractor for producing a first difference signal proportional to a difference between the video signal and the first delayed video signal, a second subtractor for producing a second difference signal proportional to a difference between the first delayed video signal and the second delayed video signal, a first signal summing device for producing a first summation signal proportional to a summation of the first difference signal and the second difference signal, a signal selecting device for controllably selecting one of the first difference signal, the second difference signal and the first summation signal as the separated component of the video signal, a second summing device for producing a second summation signal proportional to a summation of the video signal and the first delayed video signal, a third summing device for producing a third summation signal proportional to a summation of the first delayed video signal and the second delayed video signal, and a controller for controlling the selection of the separated component of the video signal by the signal selecting device based upon relative magnitudes of the second summation signal and the third summation signal. In addition a method of separating a chrominance signal from a composite color video signal is provided.

REFERENCES:
patent: 4707732 (1987-11-01), Matono et al.
patent: 4766487 (1988-08-01), Tanaka et al.
patent: 4809060 (1989-02-01), Saeki
patent: 4862252 (1989-08-01), Kuroda
patent: 4930012 (1990-05-01), Fujita
patent: 4994906 (1991-02-01), Moriwake
Y. Farondja et al., "Improving NTSC to Achieve Near-RGB Performance", Aug. 1987, p. 760.
J. P. Rossi, "Digital TV Comb Filter with Adaptive Features", Jul. 1976.

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