How to Pick the Best Antialiasing Filter for Your Signal

摘要

We have gone over the filter specifications regarding frequency response, phase, and delay plots of the four most popular filters. If you understand what kind of measurements are important to you and know what type of input to expect from the test, then you can select an appropriate filter for the job. Linear phase or elliptical is the best general-purpose filter as long your waveform does not have many high-frequency components above the fc. Bessel is the best if your signal is a sharp pulse or square wave. Butterworth is best when most frequencies of your signal are less than half of your filter fc.