Howtosignalprocessing
- Does zero padding affect FFT?
- What is the use of zero padding in FFT?
- Does zero padding reduce spectral leakage?
- Is zero padding is mandatory for both linear and circular convolution?
Does zero padding affect FFT?
Zero padding allows one to use a longer FFT, which will produce a longer FFT result vector. A longer FFT result has more frequency bins that are more closely spaced in frequency.
What is the use of zero padding in 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.
Does zero padding reduce spectral leakage?
Zero-padding a signal does not reveal more information about the spectrum, but it only interpolates between the frequency bins that would occur when no zero-padding is applied. In particular, zero-padding does not increase the spectral resolution.
Is zero padding is mandatory for both linear and circular convolution?
The linear convolution of an N-point vector, x , and an L-point vector, y , has length N + L - 1. For the circular convolution of x and y to be equivalent, you must pad the vectors with zeros to length at least N + L - 1 before you take the DFT.
