Zero padding consists of extending a signal (or spectrum) with zeros to extend its time (or frequency band) limits.
3
votes
1answer
101 views
Zero-Padding seems to CHANGE FFT of signal!
I am having trouble with zero-padding. As I understand it, in theory, zero-padding in the time-domain should 'sinc-interpolate' the FFT of the signal in the frequency domain.
This would mean, that ...
3
votes
0answers
66 views
How exactly does MATLAB zeropad?
I am doing some massive number crunching in MATLAB which involves millions of PSD estimations. Each data segment has length 41. So I have been using the multi-taper method with nfft=41 (details below ...
1
vote
3answers
280 views
FFT Zero Padding - Amplitude Change
I'm just learning about Fourier Transforms and as an input I'm using a WAV file (Matlab) and taking one channel of it and performing a quick Fourier transform. I've zero padded the input, as I've been ...
0
votes
0answers
41 views
how to pad the zeros
i have to do the convolution of two signals by employing FFT. as i am new to programming, please tell the steps that how to pad the zeros to signals to make it of equal length as the number of fft ...
0
votes
2answers
95 views
change FFT bins position
I'm sampling a signal at 44100kHz, and I have 1024 samples on which I perform an FFT.
My bin resolution is therefore around 43 hz/bin, so the frequencies I get energy for are multiples of 43hz: ...
1
vote
0answers
141 views
Estimating The Time-delay using the Phase of the Cross- Correlation function
I am relatively new to time delay estimation. I am working on a project where I am estimating the time-delay from the phase of the cross-correlation function (CCF), since it is more reliable in ...
5
votes
2answers
336 views
Sense of zeropadding in a time domain
I have the task related to Radon transform which contains a subtask which uses resampling by means of DFT.
Let's consider the non-periodical discretized signal (Fig.1) (for example the string of ...
3
votes
1answer
487 views
Padding Images To Solve Inverse Filtering Problem?
Let's say that the point spread function, h, is known for a blurred image B.
If we want to apply an inverse filtering method (eg. Direct Inverse Filtering for noiseless images, Wiener Filter, ...
3
votes
2answers
749 views
How to remove the boundary effects arising due to zero padding in scipy/numpy fft?
I have made a python code to smoothen a given signal using the Weierstrass transform, which is basically the convolution of a normalised gaussian with a signal.
The code is as follows:
...
7
votes
2answers
726 views
Frequency-domain zero padding - special treatment of X[N/2]
Suppose we wish to interpolate a periodic signal with an even number of samples (e.g. N=8) by zero-padding in the frequency domain.
Let the DFT X=[A,B,C,D,E,F,G,H]
...
