Padding

Phase of an FFT after zeropadding

Phase of an FFT after zeropadding
  1. What does zero padding do to FFT?
  2. Why is zero padding useful?

What does zero padding do to FFT?

In addition to making the total number of samples a power of two so that faster computation is made possible by using the fast Fourier transform (FFT), zero padding can lead to an interpolated FFT result, which can produce a higher display resolution.

Why is zero padding useful?

Zero padding enables you to obtain more accurate amplitude estimates of resolvable signal components. On the other hand, zero padding does not improve the spectral (frequency) resolution of the DFT. The resolution is determined by the number of samples and the sample rate.

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