[PD] Real-time frequency filtering and analysis
Chuckk Hubbard
badmuthahubbard at gmail.com
Wed Mar 28 23:31:57 CEST 2007
Airhorns.
-Chuckk
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
>
> _______________________________________________
> PD-list at iem.at mailing list
> UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
>
--
http://www.badmuthahubbard.com
More information about the Pd-list
mailing list