Question

What is the pass band edge frequency of an analog low pass normalized filter?

(a) 0 rad/sec

(b) 0.5 rad/sec

(c) 1 rad/sec

(d) 1.5 rad/sec

I have been asked this question during a job interview.

This question is from Frequency Transformations in the Analog Domain topic in section Digital Filters Design of Digital Signal Processing

Answer 1

The correct choice is (c) 1 rad/sec

To elaborate: Let H(s) denote the transfer function of a low pass analog filter with a pass band edge frequency ΩP equal to 1 rad/sec. This filter is known as analog low pass normalized prototype.