Question

The fourier tranform of one impulse train is also another impulse train with a period of the output equal to the

(a) Period of the input

(b) Reciprocal of the period of input signal

(c) Half the period of input

(d) Twice the period of the input

The question was posed to me during an interview.

My doubt stems from Formatting Analog Information in portion Formatting and Baseband Modulation of Digital Communications

Answer 1

The correct answer is (b) Reciprocal of the period of input signal

The explanation is: When we perform fourier tranform on one impulse train we will get another impulse train with its period reciprocally related to each other.