Phased digital filtering in multichannel environment

Details Phased digital filtering in multichannel environment Phased digital filtering in multichannel environment

1989-11-07

1991-11-26

Dixon, Joseph L.

Boots, shoes, and leggings

3647241, 341122, 307241, 370112, 370123, H04J 1500

Patent

active

050688138

ABSTRACT:
Parallel multistage, multirate digital filters are executed by a digital signal processor for signals on a plurality of channels. Parallel signals are converted from a first sampling frequency to a second sampling frequency by applying the signal from each channel to one of the substantially identical multistage, multirate digital filters. Each stage of each multistage, multirate digital filter includes a plurality of subfilters and a commutator for indicating a subfilter for execution. The commutators index at the same frequency for like stages of each multistage, multirate digital filters. Initial commutator positions are staggered between multistage, multirate digital filters at at least the highest rate stage. Variable delay lines may be included in each channel to compensate for interchannel data skew introduced by commutator staggering.

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Sheingold, D. H., Analog-Digital Conversion Handbook, Prentice-Hall, 1986, pp. 32-37.

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