Cascaded recursive digital filter

Details Cascaded recursive digital filter Cascaded recursive digital filter

1977-07-01

1978-11-14

Malzahn, David H.

Boots, shoes, and leggings

G06F 738, G06F 1534

Patent

active

041259009

ABSTRACT:
A cascaded digital recursive filter is designed to filter a time varying digital input signal by repetitively implementing a sequence of filtering equations which include a predetermined number of filter coefficients to generate a filtered digital output signal. The filter includes a clock for generating a series of timing pulses. A coefficient selection means is responsive to the timing pulses and generates a pulse grouping signal. The pulse grouping signal groups the timing pulses into repetitive trains of individually numbered pulses. The coefficient selection means also generates a repetitive series of stored filter coefficients, each of which is associated with an individually numbered pulse in each train. The output of the coefficient selection means is transferred to a coefficient output line. A variable store means is responsive to the timing pulses and to the pulse grouping signal for selectively storing variables generated by a processor means and for generating a partially repetitive series of variables on a variable output line. The processor means is coupled to the coefficient output line of the coefficient selection means and to the variable output line of the variable store means and responds to the digital input signal and to the pulse grouping signal to combine selected stored filter coefficients, selected variables and the digital input signal to generate a filtered digital output pulse at the end of each train of numbered pulses.

REFERENCES:
patent: 3703632 (1972-11-01), Shanks
patent: 3777130 (1973-12-01), Crorsier et al.
patent: 4021654 (1977-05-01), Harris et al.

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