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 edurb...@sea.plala.or.jp http://www9.plala.or.jp/edurbrow/
