[PD] Real-time frequency filtering and analysis

Chuckk Hubbard badmuthahubbard at gmail.com
Wed Mar 28 23:31:57 CEST 2007



On 3/28/07, Charles Henry <czhenry at gmail.com> wrote:
> filtering in general may not be the best approach because some of your
> partials from one xylophone note will overlap with other note's
> partials.  They are inharmonic complex tones, which are not so easy to
> predict.... you'll probably have to measure the frequencies of each
> note of your xylophone to know exactly what the spectrum is like.
> In terms of averaging like Jamie suggested... suppose you want to
> compute the expectation of the power spectral density.  You would take
> the fft of the auto-covariance of your recieved signal, divided by the
> number of blocks in your time frame.  (dividing by a number of blocks
> will not in general be necessary, when all you need to do is find a
> peak, with pique~ as before)
> This will give you a very clear/accurate peak, without much
> jitter/noise to clean up.
> Chuck
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