Question

A nyquist pulse is the one which can be represented by _____ shaped pulse multiplied by another time function.

(a) Sine

(b) Cosine

(c) Sinc

(d) None of the mentioned

The question was asked in a job interview.

My question is taken from Intersymbol Interference-1 topic in portion Baseband Demodulation and Detection of Digital Communications

Answer 1

Right option is (c) Sinc

For explanation I would say: A nyquist filter is one whose frequency transfer function can be represented by a rectangular function convolved with any real even symmetric frequency function and a nyquist pulse is one whose shape can be represented by sinc function multiplied by another time function.