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Improving FIR Filter Coefficient Precision [DSP Tips & Tricks]

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1 Author(s)
Zhi Shen ; Dept. of Electron. & Inf. Eng., Huazhong Univ. of Sci. & Technol., Wuhan, China

There is a method for increasing the precision of fixed-point coefficients used in linear-phase finite impulse response (FIR) filters to achieve improved filter performance. The improved performance is accomplished without increasing either the number of coefficients or coefficient bitwidths. At first thought, such a process does not seem possible, but this article shows exactly how this novel filtering process works.

Published in:

Signal Processing Magazine, IEEE  (Volume:27 ,  Issue: 4 )