I am having some problems understanding how the Fourier transform method is used to determine the FIR filter.
As far as i have understood, you start by using the ideal impulse reponse for the specific filter design you want to have. Those are given in this table
As the the ideal impulse reponse contains infinite impulses, we truncate the infinite to finite a number by $m$, (which is confusing how this is done).
But my question is how do predetermine the order of the filter, without having to try randomly, using this method?
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