Comb filter

Details Comb filter Comb filter

1991-05-16

1993-07-27

Oberley, Alvin E.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 36, H04N 964

Patent

active

052314774

ABSTRACT:
A comb filter serves to process an input digital video signal which is derived from an analog video signal by a analog-to-digital conversion including a sampling process responsive to a system clock signal. The comb filter includes a separating device for separating the input video signal into a plurality of video signals which are offset with each other in timing and which have a clock rate equal to 1/N times a clock rate of the system clock signal where N denotes a predetermined natural number greater than 1. A first delaying device serves to delay a first output signal of the separating device. A chroma signal processor separates a first chroma signal in response to the first output signal of the separating device and an output signal of the first delaying device. A first subtracter serves to subtract the first chroma signal from the output signal of the first delaying device. A second delaying device serves to delay a second output signal of the separating device. An interpolating device serves to interpolate the first chroma signal into a second chroma signal to compensate for a difference in timing between the output signal of the second delaying device and the first chroma signal. A second subtracter serves to subtract the second chroma signal from the output signal of the second delaying device. A combining device serves to combine an output signal of the first subtracter and an output signal of the second subtracter into a luminance signal.

REFERENCES:
patent: 4703342 (1987-10-01), Takahashi
patent: 4845547 (1989-07-01), Naimpally
patent: 4980737 (1990-12-01), Umegawa
patent: 4985757 (1991-01-01), Yasuki et al.

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