Question

How does the frequency of oscillations in the pass band of a low pass filter varies with the value of M?

(a) Decrease with increase in M

(b) Increase with increase in M

(c) Remains constant with increase in M

(d) None of the mentioned

This question was posed to me during an online interview.

This interesting question is from Design of Linear Phase FIR Filters Using Windows in division Digital Filters Design of Digital Signal Processing

Answer 1

Correct answer is (b) Increase with increase in M

To explain I would say: The frequency of oscillations in the pass band of a low pass filter increases with an increase in the value of M, but they do not diminish in amplitude.