Recursive digital filter with less no-signal noise

Details Recursive digital filter with less no-signal noise Recursive digital filter with less no-signal noise

1989-07-31

1990-04-24

Harkcom, Gary V.

Boots, shoes, and leggings

36472403, G06F 1531

Patent

active

049205072

ABSTRACT:
A recursive digital filter comprises an input terminal receiving an input signal, an output terminal for outputting a filtered signal, an offset value circuit for outputting a predetermined offset value, an adder having a first input connected to the input terminal and a second input connected to receive the predetermined offset value from the offset value circuit, and a recursive digital filter loop having an input connected to an output of the adder and an output connected to the output terminal. With this arrangement, the recursive digital filter loop receives the input signal added wtih the predetermined offset value, so that, even if the input signal is zero the recursive digital filter loop will process some signal which is not zero, and accordingly, the result of the processing of the recursive digital filter loop never becomes zero. Accordingly, the limit cycle caused due to accumulation of rounding error will not occur.

REFERENCES:
patent: 3619586 (1971-11-01), Hoff, Jr. et al.
patent: 4117541 (1978-09-01), Ali
patent: 4185325 (1980-01-01), Appel
patent: 4467440 (1984-08-01), Sano et al.
patent: 4507725 (1985-03-01), Christopher et al.
patent: 4521867 (1985-06-01), Kasuga
patent: 4523291 (1985-06-01), Giubbolini et al.
patent: 4545026 (1985-10-01), Baggett et al.
patent: 4750146 (1988-06-01), Dalquist et al.
patent: 4823296 (1989-04-01), Millar
Varoufakis et al, "Design and Implementation of a Special Class of Multiplierless Digital Filters", IEEE 1982, CH1681-6/82, pp. 523-526.

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