Feedback comb-type filter

Details Feedback comb-type filter Feedback comb-type filter

1986-04-15

1987-08-04

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 36, 358167, H04N 978, H04N 5213

Patent

active

046849769

ABSTRACT:
This invention relates to a feedback comb-type filter used for improving the S/N ratio of video signals and so constructed as to delay the output of a coefficient multiplier and to get a feedback delay signal contrary to the conventional one which gives to the coefficient multiplier the filter output, that is, the signal to be output to the exterior, thereby enabling to improve the S/N ratio only by varying the coefficient of the coefficient multiplier, also constructed to be able to cut off the feedback delay signal to suppress generation of pseudo signal and use one low pass filter for both the delay circuit and the limit of horizontal frequency band to reduce the components in number, thereby expecting improvements in accuracy and reliability.

REFERENCES:
patent: 3836707 (1974-09-01), Murakami et al.
patent: 4074321 (1978-02-01), Miller
patent: 4096516 (1978-06-01), Pritchard
patent: 4143397 (1979-03-01), Holmes
patent: 4443817 (1984-04-01), Faroudja
patent: 4607285 (1986-08-01), Hirota et al.
IEEE Trans., CE-29, 179-94-Yamashita et al, (Aug. 1983) New Systems for Video Processing ICs.

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