Parallel infinite impulse response (IIR) filter with low quantiz

Details Parallel infinite impulse response (IIR) filter with low quantiz Parallel infinite impulse response (IIR) filter with low quantiz

1993-12-02

1995-07-11

Envall, Jr., Roy N.

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36472417, G06F 1531

Patent

active

054327237

ABSTRACT:
A parallel IIR filter (100) has low quantization effects and includes a multiplier (103) which multiplies a digital input signal by a constant, and an arbitrary number of biquad filters (104, 105). Outputs of the multiplier (103) and each biquad filter (104, 105) are summed together in a summing device (106) to provide an output signal of the IIR filter (100). The IIR filter (100) first expresses its transfer function as a cascade form transfer function, and then calculates the constant as a product of a constant term of each cascade form biquad term. The IIR filter (100) partially decomposes the cascade form transfer function to provide first order terms, and calculates numerator coefficients of the first-order terms. Pairs of decomposed terms are recombined to provide a parallel form transfer function, from which parallel form coefficients are taken and applied to the biquad filters (104, 105).

REFERENCES:
patent: 4185325 (1980-01-01), Appel
patent: 4255794 (1981-03-01), Nakayama
patent: 4305133 (1981-12-01), Amada et al.
patent: 4811263 (1987-03-01), Hedley et al.
patent: 5189634 (1993-02-01), Eberle et al.
Leland B. Jackson; "Digital Filters and Signal Processing;" University of Rhode Island; pp. 195-204, (1986).
T. W. Parks; "Digital Filter Design;" School of Electrical Engineering, Cornell University; pp. 238-239, (1987).

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