Infinite impulse response filters

Details Infinite impulse response filters Infinite impulse response filters

1986-09-24

1989-03-07

Malzahn, David H.

Boots, shoes, and leggings

36472417, G06F 1531

Patent

active

048112631

ABSTRACT:
An infinite impulse response (IIR) filter is operative to filter an input signal that comprises a sequence of digital words spaced in time by an interval T. The filter includes delay circuitry that delays the input signal by successive increments of time equal to T so as to cause the production of a series of relatively delayed signals in which each signal is delayed by T with respect to the previous signal in the series. IIR processing units receive respective groups of the series of signals, the groups being offset with respect to one another by one word. The units are operative during each of plural successive clock periods equal to 2T to process respective sets of words obtained from the respective groups of the series of signals so as to produce two output words. A multiplexer combines each two output words produced during each clock period equal to 2T to constitute a filtered output signal comprising a sequence of output words spaced in time by the interval T.

REFERENCES:
patent: 4317092 (1982-02-01), Potter
patent: 4521867 (1985-06-01), Kasuga
patent: 4594725 (1986-06-01), Desperben et al.
Thirion, "Multiplex Digital Filtering Technique" IBM Tech. Disclosure Bulletin, vol. 16, No. 12, May 1974, pp. 3942-3943.
Gabel, "A Parallel Arithmetic Hardware Structure for Recursive Digital Filtering" IEEE Trans. on Acoustics, Speech, and Signal Processing, Aug. 1974, pp. 159-162.

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