Fir filter with quantized coefficients and coefficient quantizat

Details Fir filter with quantized coefficients and coefficient quantizat Fir filter with quantized coefficients and coefficient quantizat

1992-12-15

1994-10-04

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

36472416, H03M 302

Patent

active

053530268

ABSTRACT:
The n-bit coefficients of a FIR filter are encoded into m-bit digital words that represent selected bits of the original coefficients, where m is less than n, together with shift words that represent the order of the selected bits within the original n-bit coefficients. A software .sigma.-.DELTA. modulator is used to implement the encoding. The reduction in coefficient bits allows for a corresponding reduction in hardware multiplier capacity required to convolve the encoded coefficients with input data. The quantization error from the encoding is shaped to a higher frequency range that can later be filtered out. The coefficients are preferably encoded into a format that coincides with the data format employed by the multiplier, such as by using a Robertson's algorithm to encode to a modified Booth format.

REFERENCES:
patent: 5153846 (1992-10-01), Rao
patent: 5222084 (1993-06-01), Takahashi
patent: 5243552 (1993-09-01), Asakura
patent: 5245561 (1993-09-01), Sugiyama
patent: 5257056 (1993-10-01), Thompson et al.
Fink et al., Ed, Electronics Engineers' Handbook, 3rd Ed. McGraw-Hill Book Co., 1989, pp. 8.78-8.80.
Candy et al., "Oversampling Methods for A/D and D/A Conversion", Oversampling Delta-Sigma Data Converters, Ed. by Candy et al., IEEE Press, 1992, pp. 1-25.
Hwang, "Computer Arithmetic-Principles, Architecture, and Design," John Wiley & Sons, 1979, pp. 149-155 and 213-238.

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