Very Good. But why? -----Original Message----- From: Ed Durbrow [mailto:[email protected]] Sent: 05 January 2009 23:33 To: Herbert Ward; LuteNet list Subject: [LUTE] Re: Fourier measurements of lute sound.
Wow! Nice work. Do you have any screen shots of the Fourier analysis? On Jan 2, 2009, at 7:01 AM, Herbert Ward wrote: > Using computerized Fourier analysis, I measured spectra > of lute sound, using all strings in courses 1-6, plucked > with good tone. > > Several unexpected features cropped up. > > 1. The pitch of a harmonic often shifts over the duration > of the note, up to 10 cents. > > 2. The volumes of the harmonics often change relative > to each other. Sometimes this can be a strong and > surprising effect, as when the fundamental is basically absent during > the initial 0.3 second, and then assumes dominance over the harmonics > as the note dies away. > > 3. The harmonics' pitches are not consistent with each other, > especially during the initial 0.3 second. For example, the > fundamental can be at -4 cents, and the first harmonic (an octave > above the fundamental) can be at +4 cents. > > These observations provide an ample hypothesis for tuner instability, > but unfortunately suggest no solution. > > > > To get on or off this list see list information at > http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html Ed Durbrow Saitama, Japan [email protected] http://www9.plala.or.jp/edurbrow/
