source file: mills2.txt Date: Fri, 10 Jan 1997 07:04:30 -0800 Subject: Re: harmonicity of partials From: Gary Morrison <71670.2576@compuserve.com> > I got similar results from a harpsichord, but didn't have time to try > recording a low piano note In the case of the low piano tones, from what I've seen anyway, I doubt if you'll find much of anything particularly nonharmonic other than some very low-frequency stuff resulting from the chorus effect between the two or three strings in each course. High piano tones however will almost certainly show a moderately significant amount of aharmonicity. You'll probablly see a very small, but definitely significant, amount of aharmonicity in typical brass tones. Just as a general matter though, you would probably get somewhat more resolute results (if that's of interest) using the Phase Vocoding algorithm's method of tracking near-harmonic partials' frequency deviations. It does that by taking the time derivative of each partials' phase values. You have to have to look at a very short sliver of time to do that though. Received: from ns.ezh.nl [137.174.112.59] by vbv40.ezh.nl with SMTP-OpenVMS via TCP/IP; Fri, 10 Jan 1997 16:03 +0100 Received: by ns.ezh.nl; (5.65v3.2/1.3/10May95) id AA18551; Fri, 10 Jan 1997 16:06:46 +0100 Received: from eartha.mills.edu by ns (smtpxd); id XA18547 Received: from by eartha.mills.edu via SMTP (940816.SGI.8.6.9/930416.SGI) for id HAA09182; Fri, 10 Jan 1997 07:06:41 -0800 Date: Fri, 10 Jan 1997 07:06:41 -0800 Message-Id: <199701101000_MC2-E7C-6023@compuserve.com> Errors-To: madole@mills.edu Reply-To: tuning@eartha.mills.edu Originator: tuning@eartha.mills.edu Sender: tuning@eartha.mills.edu