Merged multi-stage comb filter with reduced operational requirem

Details Merged multi-stage comb filter with reduced operational requirem Merged multi-stage comb filter with reduced operational requirem

1995-12-27

1998-11-10

Malzahn, David H.

Boots, shoes, and leggings

G06F 1710

Patent

active

058353909

ABSTRACT:
A digital filter is provided for achieving substantial attenuation of aliasing or imaging bands of a signal to be filtered. The digital filter employs a comb filter technique, wherein the comb filter can perform decimation or interpolation, depending upon its application. The comb filter is a multi-stage element, having more than one stage, and having an overall word length, W.sub.L, optimally reduced. The total number of terms within the cumulative set of stages is also optimally reduced. The comb decimation or interpolation filter architecture is therefore of minimum size if employed in hardware, or utilizes minimal operations if employed in software. A filter element within the comb decimation or interpolation filter includes a z-transform C.sub.K (Z) term. The filter element can be reduced to a simple z-transform 1+z.sup.-1 term if the stage of interest includes a decimate-by-two or interpolate-by-two rate change switch.

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