The effect of the DfT complement zero

Complement 0 is often used in the DfT method, 0 can only make the sequence of the spectrum becomes meticulous, but can not improve the frequency resolution of the sequence, only to collect more valid data, to obtain the sequence of high-resolution spectrum.

The method of zero-zeroing is often used in the DFT technique of discrete Fourier transform, when using FFT technology of fast Fourier transform, the original sequence is required to be 0 when the sequence length is 2, and when the linear convolution is made using DFT technique, the original sequence must be 0 to get the correct result. The fence effect for improving DFT technique , so that the appearance of the spectrum becomes smooth, can be 0 after the original sequence, and 0 may eliminate the leakage caused by the truncation of the data.
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