Improving FIR Filter Coefficient Precision [DSP Tips and Tricks]

摘要

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.