Filter coefficient generator

Details Filter coefficient generator Filter coefficient generator

2005-05-24

2005-05-24

Tse, Young T. (Department: 2637)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S232000, C708S313000, C708S322000

Reexamination Certificate

active

06898255

ABSTRACT:
An apparatus and method for generating finite impulse response (FIR) filter coefficients are presented. The apparatus includes an address generator that multiplies a desired cutoff frequency f by an integer n to generate an address, a first look-up table that generates a sine function value of the address, a divider that divides the sine function value by n*pi, a multiplexer that generates an impulse response function value by selecting one of a value produced from the divider and 2*f based on an outside control signal, and a multiplier that multiplies the impulse response function value by a corresponding window function value to generate an nth filter coefficient for the FIR filter.

REFERENCES:
patent: 4868868 (1989-09-01), Yazu et al.
patent: 5109395 (1992-04-01), Tanaka
patent: 5933452 (1999-08-01), Eun
patent: 6184921 (2001-02-01), Limberg

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