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Results tagged with zero-padding
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user 13309
Zero padding consists of extending a signal (or spectrum) with zeros to extend its time (or frequency band) limits.
3
votes
Accepted
DFT zero-padding of signals starting before n=0
Use the second one Tony... It yields the correct implied phase relationship.
- 28.4k
5
votes
Accepted
Zero padding - High amplitude
I'd like to apply zero padding to it, for better frequency bin resolution.
First of all, let's state it one more time that zero padding does not improve frequency resolution of DFT. It'll only in …
- 28.4k
1
vote
Difference Between `fft(signal, nfft)` and `fft(signal)`
Assuming a signal x[n] of length L, The Matlab function fft(x) computes an L-point DFT of the signal, whereas fft(x,N) computes an N point DFT of x[n]. For certain reasons N must be greater or equal t …
- 28.4k
1
vote
How to multiply two FFTs in MATLAB?
You have two signals of length $N = 220500$ and $ L = 8821$ samples long, and you want to obtain their convolution $y[n]$ of length $K = N + L-1 = 229320$ samples long, by using a frequency-domain DF …
- 28.4k
1
vote
Phase of an FFT after zeropadding
Given a sequence $x[n]$, the magnitude-phase representation of its DTFT (or samples of DTFT given by an N-point DFT/FFT) has the following form:
$$ X(\omega) = |X(\omega)| e^{j\phi(\omega)} $$
where $ …
- 28.4k
6
votes
Why Zero Padding in the Center of the DFT Interpolates / Upsamples the Signal (Sinc Interpol...
What you are experiencing is technically called interpolation by DFT; i.e., interpolating a time-domain sequence $x[n]$ by properly zero filling the middle portion of it's DFT $X[k]$ (and taking the i …
- 28.4k
2
votes
How do I calculate peak amplitude of the signal components after zero padding and FFT?
Please have a look at the following MATLAB / OCTAVE code that performs a DFT analysis of the windowed sine wave including adjustable zero padding. As you can see (without any theoretical analysis) the …
- 28.4k