Group Delay and Phase Distortion in Practical DSP Filter Design
Introduction Frequency magnitude plots rarely reveal phase behavior. Yet in real-time DSP systems, phase distortion and group delay often determine overall system performance. Applications sensitive to timing include: control loops audio monitoring feedback systems instrumentation pipelines Ignoring phase characteristics can destabilize otherwise correct magnitude designs. What Is Group Delay? Group delay measures: how long different frequency components are delayed In FIR linear-phase filters: delay is constant predictable In IIR filters: ...