Stack filter with one stage per bit

Details Stack filter with one stage per bit Stack filter with one stage per bit

1990-07-11

1992-03-17

Malzahn, David H.

Boots, shoes, and leggings

G06F 1531

Patent

active

050974335

ABSTRACT:
A hierarchical stack filter performs nonlinear filtering operations such as median filtering and other rank-order filtering. The stack filter has a number of stages in the stack which equals the number of bits in the words of the input word sequence, and each filter of the stack receives as a first input signal a window of the input sequence. Each filter stage has an expansion input port and an expansion output port. Each filter stage calculates a residue and couples the residue from its expansion output port to expansion input port of the filter stage of next lesser significance.

REFERENCES:
patent: 4589019 (1986-05-01), Dischert et al.
patent: 4672567 (1987-06-01), Kelly et al.
patent: 4868773 (1989-04-01), Coyle et al.
"Stack Filters", by Wendt et al., published in the IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-34, No. 4, Aug. 1986.
"VLSI Implementation of a Fast Rank Order Filtering Algorithm", by Harber et al., published 1985 by the IEEE (CH 2118-8/85/0000-1396).

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