Spectrum difference - different number of points

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Benoit Meriot
Benoit Meriot 2016-5-30
评论： Benoit Meriot 2016-5-31
Hi everyone,
I have two signals with two diffrent sampling frequencies. Hence, my frequency vector is diffrent for each fft. I would like to have the diffrence between the two Spectrums i have. However i can not simply substract one result to the other one, since calulcation of fft is not preformed at exactly the same frequencies.
Is there a way to interpolate fft results on a choosen number of points, to be able to do this operation ?

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the cyclist
the cyclist 2016-5-30
You could use interp1 to interpolate one (or both) signals after the fft.
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Benoit Meriot
Benoit Meriot 2016-5-31
Thanks a lot ! i feel ashamed of not finding such a simple solution... In fact i was trying to use interp, and not interp1. That's why it wasn't working...

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