Digital filter with efficient quantization circuitry

Details Digital filter with efficient quantization circuitry Digital filter with efficient quantization circuitry

1998-03-30

2000-08-29

Mai, Tan V.

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

G06F 1710

Patent

active

061122181

ABSTRACT:
An infinite impulse response (IIR) digital filter and method of performing the same is disclosed. The digital filter may be realized by way of a programmable logic device, such as a digital signal processor (75), or alternatively by way of dedicated logic including adders (44, 48, 50, 54, 58, 62, 66, 70, 72) and shifters (46, 52, 56, 60, 64). In either case, addition operations (34) are interleaved among first and second output sample values (y.sub.n-1, y.sub.n-2), so that the resulting addition (30; 72; 215; 320) may be carried out with adder circuitry of the same precision as the signal input (x.sub.n) and signal output (y.sub.n). Carry control circuitry (76, 78, 80, 82, 84, 88; 217; 317) is provided to efficiently incorporate magnitude truncation quantization.

REFERENCES:
patent: 3892953 (1975-07-01), Nussbaumer
patent: 5629881 (1997-05-01), Leeb et al.
patent: 5798954 (1998-08-01), Ishibata
patent: 5944775 (1999-08-01), Satoshi
"A Computer-Aided Test for the Absence of Limit Cycle in Fixed-Point Digital Filters," Bauer, et al., IEEE Transactions On Signal Processing, vol. 39, No. 11, Nov. 1991, pp. 2400-2410.
"Chapter 7: Robust Digital Filter Structures," P. P. Vaidyanathan, Mitra and Kaiser, Handbook for Digital Signal Processing (Wiley & Sons,1993), pp. 419-490.

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