Recursive first order digital video signal filter

Details Recursive first order digital video signal filter Recursive first order digital video signal filter

Filed on

1986-02-14

Date issued

1989-02-28

Examiner

Harkcom, Gary V.

Patent Class

Boots, shoes, and leggings

Other Related Categories

36472417, 364745, G06F 1531

Type

Patent

Status

active

Patent number

048092070

Description

ABSTRACT:
Continued circulation of residual signal values in a recursive first order digital video signal filter, in which a truncation circuit (37) is used for eliminating a portion of the least significant bits in the feedback signal path (31, 37, 43, 11) of the filter, is prevented by adding (19, 47, 51) before the trucation circuit a logic one value to the feedback signal path at the level of the least significant bit of the bits remaining after the truncation circuit. Video signal filters of such a type are frequently used as noise suppression circuits.

REFERENCES:
patent: 4034196 (1977-07-01), Butterweck et al.
patent: 4195350 (1980-03-01), Moore
patent: 4236224 (1980-11-01), Chang
patent: 4589084 (1986-05-01), Fling et al.
Gold et al., Digital Processing of Signals, pp. 112-116, McGraw-Hill Book Co., New York, N.Y., 1971.

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