source file: mills2.txt Date: Wed, 8 Jan 1997 07:52:30 -0800 Subject: Re: harmonicity of partials From: bil@ccrma.Stanford.EDU (Bill Schottstaedt) I got inspired by the recent discussion to digitize several 1 minute takes of me playing the smoothest, non-vibrato notes I could on my cello, then run 1-megaword FFTs over the data, getting around .02 to .05 Hz resolution (unless I messed up the arithmetic...) in the fft bins, and within that resolution I couldn't see any inharmonicity that was consistent (that is, some partials were a tiny bit high, others low, others right on). The actual multiplier overall was .9999875. I got similar results from a harpsichord, but didn't have time to try recording a low piano note (we seem to have lost our copy of the McGill CD's, so I couldn't just grab that data). (I used a spline interpolation kludge to find the "true" peak, given the surrounding bins). Received: from ns.ezh.nl [137.174.112.59] by vbv40.ezh.nl with SMTP-OpenVMS via TCP/IP; Wed, 8 Jan 1997 19:26 +0100 Received: by ns.ezh.nl; (5.65v3.2/1.3/10May95) id AA06105; Wed, 8 Jan 1997 19:29:25 +0100 Received: from eartha.mills.edu by ns (smtpxd); id XA06039 Received: from by eartha.mills.edu via SMTP (940816.SGI.8.6.9/930416.SGI) for id KAA13770; Wed, 8 Jan 1997 10:29:14 -0800 Date: Wed, 8 Jan 1997 10:29:14 -0800 Message-Id: <32D3E536.34C2@ix.netcom.com> Errors-To: madole@ella.mills.edu Reply-To: tuning@eartha.mills.edu Originator: tuning@eartha.mills.edu Sender: tuning@eartha.mills.edu