Prosig Signal Processing Blog

Notes, tutorials, news and articles on digital signal capture, processing, techniques and applications

June 6, 2001

REMOVING PHASE DELAY USING PHASELESS FILTERING

By Dr Colin Mercer, Technical Director, Prosig

In many instances we need to filter a signal to remove unwanted frequencies. If we use classical filters such as Butterworth, Chebyshev or even Bessel then a phase delay is introduced. This phase delay is itself a function of frequency so that the signal content at one frequency is delayed a different amount to that at another frequency. Why does this matter? read »»»

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