Question

The anti-symmetric condition is not used in the design of low pass linear phase FIR filter.

(a) True

(b) False

This question was addressed to me in an international level competition.

The above asked question is from Design of FIR Filters in portion Digital Filters Design of Digital Signal Processing

Answer 1

Correct choice is (a) True

Easy explanation: We know that if h(n)=-h(M-1-n) and M is odd, we get H(0)=0 and H(π)=0. Consequently, this is not suitable as either a low pass filter or a high pass filter and when h(n)=-h(M-1-n) and M is even, we know that H(0)=0. Thus it is not used in the design of a low pass linear phase FIR filter. Thus the anti-symmetric condition is not used in the design of low pass linear phase FIR filter.