you could also check sigmund~ it will give you a list of frequencies and amplitudes in order of amplitude.
J > > I think this just reinforces what everyone is saying > about the errors. Either you make it into a crazy > competition to vote by banging your note the loudest > and the mostest, or you accept a margin of error. > As Jamie says the intensity and frequencies are all > going to vary and interact. > > attached patch intented to investigate that, it makes > little clusters of 10 votes (idealised sinewave "xylophone") > separated in time by a value between 0 and 100ms at > one of 3 frequencies chosen at random. > What you wont get in reality is the notes being exactly > the same frequency, there should be a fair degree > of variance. When I used a focused noise source to > approximate the xylophones inharmonic spectrum > I couldn't see any correlation above chance. YMMV, > especially if you tweak the windows/blocks . > > I got better initial results with the filter bank approach > I think. > > > > > > On Wed, 28 Mar 2007 09:16:23 -0500 > "Charles Henry" <[EMAIL PROTECTED]> 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@iem.at mailing list > > UNSUBSCRIBE and account-management -> > > http://lists.puredata.info/listinfo/pd-list > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: fftbincount-harness-pings.pd > Type: application/octet-stream > Size: 39247 bytes > Desc: not available > Url : > http://lists.puredata.info/pipermail/pd-list/attachments/20070329/f2b9456a/attachment.obj > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: fbank-harness-pings.pd > Type: application/octet-stream > Size: 36448 bytes > Desc: not available > Url : > http://lists.puredata.info/pipermail/pd-list/attachments/20070329/f2b9456a/attachment-0001.obj > > ------------------------------ > > _______________________________________________ > PD-list mailing list > PD-list@iem.at > to manage your subscription (including un-subscription) see > http://lists.puredata.info/listinfo/pd-list > > > End of PD-list Digest, Vol 24, Issue 133 > **************************************** > _______________________________________________ PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list