IIR digital filter having low coefficient sensitivity

Details IIR digital filter having low coefficient sensitivity IIR digital filter having low coefficient sensitivity

1982-08-23

1985-06-04

Thomas, James D.

Boots, shoes, and leggings

333166, G06F 738, H03H 728

Patent

active

045218676

ABSTRACT:
Input discrete samples x.sub.n are applied to an adder through a first set of feedforward paths which successively delay and multiply the samples by selected coefficient values and are also applied to an adder-subtractor through a second set of feedforward paths which successively delay and shift the input samples by selected values. Output discrete samples y.sub.n are supplied from the adder-subtractor to the adder through a first set of feedback paths by successively delaying and scaling the samples by selected values of coefficient and are also applied to the adder-subtractor through a second set of feedback paths by successively delaying and shifting the samples by selected values. The samples applied to the adder are combined into a first signal representing an integer part of the filter coefficient, while those applied to the adder-subtractor are combined into a second signal representing a fractional part of that coefficient, the first and second signals being combined in the adder-subtractor to provide the output samples y.sub.n. Bit shifting means is provided for shifting samples which appear in any location of the filter to provide the first signal.

REFERENCES:
patent: 3727153 (1973-04-01), McAuliffe
patent: 4185325 (1980-01-01), Appel
patent: 4250472 (1981-02-01), Hashimoto
Avenhaus, Ernst, "A Proposal to Find Suitable Canoical Structures for the Implementation of Digital Filters With Small Coefficient Wordlength", NTZ, 15, 8, pp. 377-382.
Agarwal, Ramesh et al, "New Recursive Digital Filter Structures Having Very Low Sensitivity and Roundoff Noise", IEEE.

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