[PD] Spectrum graphing amplitude problem
matju at artengine.ca
Mon Oct 22 01:49:53 CEST 2007
On Sun, 21 Oct 2007, Jason Plumb wrote:
> I'm a bit new to FFT in the pd context, but I think I grok Nyquist --
> Sampling at S can, at best, yield the S/2 frequency (where S is the
> sampling rate). But how does this relate to block size in the DFT? Your
> original statement sounds like the max frequency out of the fft is
> (block size)/2...but that can't be right, eh?
The most rapid change you can have in a signal is an alternance of two
values: e.g. +1, -1, +1, -1, +1, -1, ... which has S/2 frequency.
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