Question

The characteristic of windowing the signal called “Leakage” is the power that is leaked out into the entire frequency range.

(a) True

(b) False

I got this question in an interview.

My enquiry is from Frequency Analysis of Signals Using DFT in portion Discrete Fourier Transform – Properties and Applications of Digital Signal Processing

Answer 1

Correct choice is (a) True

For explanation: We note that the windowed spectrum \(\hat{X}\)(w) is not localized to a single frequency, but instead it is spread out over the whole frequency range. Thus the power of the original signal sequence x(n) that was concentrated at a single frequency has been spread by the window into the entire frequency range. We say that the power has been leaked out into the entire frequency range and this phenomenon is called as “Leakage”.