Linear phase characteristic of FIR filter

Question

Explain the essential and adequate condition required for the linear phase characteristic of the FIR filter? List the well known technique for designing the linear phase FIR filter?

Answer 1

Phase function must be the linear function of w, that in turn need consistent group delay and the phase delay.

Technique for designing linear phase FIR filter:

a) Frequency sampling method.

b) Fourier series method and the window method.

c) Best possible filter design method.