Howtosignalprocessing
- Does zero padding affect FFT?
- Why zero padding is needed in FFT?
- Is zero padding is mandatory for both linear and circular convolution?
- Why is zero padding done in 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.
Why zero padding is needed 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.
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.
Why is zero padding done in circular convolution?
The method of extending signals by adding zeros is known as zero padding . If three zeros are added to each of the signals and then a circular convolution is performed, the result is the same as that of a linear convolution.
