Azzera filtri
Azzera filtri

How to zero pad in frequency domain ?

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Karthikeyan
Karthikeyan il 14 Ott 2011
how to zero-pad in frequency domain?

Risposta accettata

Naz
Naz il 14 Ott 2011
You zeropad a matrix of frequency spectrum the same way you would zeropad any matrix. For example, if your frequency matrix is m*n and you want to add two rows of zeros at the top and bottom, you simply do:
x=zeros(2,n);
zeropaddedmatrix=[x;matrix;x];
which will result in
000000
000000
matrix
000000
000000
Now, how to zeropad a frequency spectrum is a different question and depends on the particular application, that is, how you want to alter your frequency spectrum.

Più risposte (1)

Greg Heath
Greg Heath il 14 Ott 2011
fft
fftshift
zeropad both ends %different for N odd and N even
ifftshift
ifft % interpolates original time function
Hope this helps.
Greg

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