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US 8,725,785 B1Granted
Parallel infinite impulse response filter
AssigneeL-3 Communications Corporation
InventorsOsama S. Haddadin, Brad T. Hansen, Ryan Hinton
Life of this patent
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Abstract
A technique for performing parallel-input parallel-output infinite impulse response (IIR) filtering uses two parallel-input-parallel-output finite impulse response (FIR) filters. One FIR filter is used as a feed-forward filter and one FIR filter is used as a feed-back filter. The feed-back filter is coupled to delays and summers to allow the filter operations to be performed in parallel.
Claims15
A parallel-input parallel-output infinite impulse response filter comprising:
- a first finite impulse response filter having a parallel input and a parallel output;
- a plurality of delays coupled to the first finite impulse response filter;
- a plurality of summers coupled in a feed-back arrangement to the plurality of delays and to the first finite impulse response filter so as to form an all-pole filter;
- and
- a second finite impulse response filter having a parallel input and a parallel output to form an all-zero filter, wherein the second finite impulse response filter is configured to produce filtered samples at the parallel output from input samples at the parallel input, and wherein each of the input samples at the parallel input is different than any previous input samples,
- wherein the first finite impulse response filter and the second finite impulse response filter are coupled to form a parallel-input parallel-output infinite impulse response filter having both poles and zeros.
3 more elements
Dependencies are inferred from the claim text.