The DTFT is often used to analyze samples of a continuous function. The term discrete-time refers to the fact that the transform operates on discrete data, often samples whose interval has units of time.

Where do we use DTFT?

In mathematics, the discrete-time Fourier transform (DTFT) is a form of Fourier analysis that is applicable to a sequence of values. The DTFT is often used to analyze samples of a continuous function.

What is difference between DFT and DTFT?

A DFT sequence has periodicity, hence called periodic sequence with period N. A DTFT sequence contains periodicity, hence called periodic sequence with period 2π. The DFT can be calculated in computers as well as in digital processors as it does not contain any continuous variable of frequency.