How to zero pad in frequency domain ?

how to zero-pad in frequency domain?

Answer 1

[Naz]

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.

Answer 2

[Greg Heath]

fft

fftshift

zeropad both ends %different for N odd and N even

ifftshift

ifft % interpolates original time function

Hope this helps.

Greg