Filtering signals based on their frequency content is a very widely used signal processing method. This lesson will teach you the terminology used in the design of frequency selective filters and lays the foundation for learning design methodologies. You will also gain appreciation for the practical limitations on filter frequency response.

# Intro to Filter Design

## Characterizing Filter Phase Response

In this lesson you will learn the metrics used to characterize the phase response of filters. Phase response plays an important role in determining the distortion introduced by a filter. You will learn how group delay is used to characterize phase distortion. Understanding the impact of filter phase is an important skill to develop for […]

## Zero Phase Filtering

A zero-phase filter introduces no phase distortion. In this lesson you will learn the conditions under which zero phase filtering is possible, how to obtain a zero-phase filter from an arbitrary filter, and the consequences of zero phase filtering. Understanding these concepts is critical for the proper application of zero-phase filters.

## Overview of FIR and IIR Filters

One of the first choices faced by the filter designer is whether to use a finite impulse response (FIR) or infinite impulse response (IIR) filter. In this lesson you will learn the defining characteristics of FIR and IIR filters. Understanding the distinctions between these classes of filter will enable you to successfully choose the right […]