Equiripple Filter-Design

1. What is an Equiripple filter?
2. Why use Equiripple filter?
3. What is equiripple in Matlab?
4. What is meant by optimum Equiripple design criterion?

What is an Equiripple filter?

An equiripple filter is simply a filter with ripples of equal height. The magnitude response of actual digital filters may exhibit ripples.

Why use Equiripple filter?

Equiripple filter designs minimize the maximum ripple in the passbands and stopbands. When you use equiripple with Nyquist filter specification objects, you might encounter design cases where the filter design does not converge.

What is equiripple in Matlab?

Equiripple filter designs minimize the maximum ripple in the passbands and stopbands. hd = design(d,'equiripple',Name,Value) returns an equiripple FIR filter where you specify design options as Name,Value pairs.

What is meant by optimum Equiripple design criterion?

It is viewed as an optimum design criterion in the sense that the weighted approximation error between the desired frequency response and the actual frequency response is spread evenly across the passband and evenly across the stopband of the filter minimizing the maximum error.