Noise filter

Details Noise filter Noise filter

1980-05-09

1981-09-22

Bookbinder, Marc E.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358167, H04N 9535

Patent

active

042913330

ABSTRACT:
A recursive digital filter is disclosed for removing noise from an incoming television signal. The filter couples the incoming television signal to a subtracter without substantial attenuation of the television signal. The subtracter also receives at an input an attenuated difference signal comprising a selected amplitude of the difference between the incoming signal and an earlier received signal which has been delayed for an interval corresponding to one television frame. The subtracter subtracts the attenuated difference signal from the incoming signal and develops an output in which noise is substantially reduced.

REFERENCES:
patent: 3978409 (1976-08-01), Dolby
patent: 4058836 (1977-11-01), Drewery
patent: 4064530 (1977-12-01), Kaiser
patent: 4107739 (1978-08-01), Rossi
patent: 4163249 (1979-07-01), Michael
"Theoretical Improvement in Signal to Noise Ratio of Television Signals by Equivalent Comb Filter Technique" Stateman, et al., Date & Publication Data Unknown.
"Digital Recursive Filter" IBM Tech. Disc. Bulletin vol. 14 #10 Mar. 1972 Abensour.

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