Digital filter

Details Digital filter Digital filter

1979-05-09

1981-03-10

Smith, Jerry

Boots, shoes, and leggings

G06F 1531

Patent

active

042557941

ABSTRACT:
The digital filter which performs a filter mathematical operation on 2N samples Zi expressed by binary codes in which an output sample y(n) of said filter is expressed by the following equation: ##EQU1## where magnitude of ##EQU2## represents a product of a sign of Ai and Zi, S.sub.jl represents a total sum of Zi* corresponding to ##EQU3## The digital filter comprises, a first memory device for storing continuous 2N sample values, a second memory device for storing partial coefficients aij (j<k) which are obtained by dividing each coefficient Ai with k and sign of Ai, a first device for determining a total sum Sjl of sample values stored in the first memory device and relating to l=aij of a partial coefficient aij read out from the second memory device, a shifter for shifting an output Sj of the first device by 2.sup.Mo-jM (Mo and M are positive integers) a second device for cummulatively adding k times an output 2.sup.Mo-jM. S.sub.j of the shifter to obtain ##EQU4## a third device for cummulatively adding (2.sup.M -1-m) times the output of the second device to obtain ##EQU5## and a fourth device for cummulatively adding (2.sup.M -2) times an output of the third device to obtain an output y(n) of the filter.

REFERENCES:
patent: 3777130 (1973-12-01), Croisier et al.
patent: 3988606 (1976-10-01), Eggermont
patent: 4125900 (1978-11-01), Betts

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