Howtosignalprocessing
- Does zero padding affect FFT?
- What is the use of zero padding in FFT?
- What do the real and imaginary parts of FFT represent?
- Does zero padding improve FFT resolution?
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.
What do the real and imaginary parts of FFT represent?
The real portion of an FFT result is how much each frequency component resembles a cosine wave, the imaginary component, how much each component resembles a sine wave.
Does zero padding improve FFT resolution?
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.
