----- Original Message ----- From: "Isaac sur Noos" <oleg-i@noos.fr> To: "Don A. Gilmore" <eromlignod@kc.rr.com>; "Pianotech Mailing list" <pianotech@ptg.org> Sent: Thursday, December 25, 2003 10:46 AM Subject: RE: "Self tuning piano" questions > Hello, very ingenious and certainly repeatable system. > > That's funny this was my next question to ask if the pickup should be > able to energize the string ! > > Did you experiment this "overdrive" effect while the piano play ? It > could be a method to correct the sound of a piano, or to produce new > kind of tones ? I considered this idea briefly. You could locate drive coils at strategic places along a string and and enhance/inhibit individual partials for special timbre effects. But the sustaining effect would probably be too slow for real-time playing and would affect decay, etc. Besides, it would really only be a novelty; synthesizers can do this and more in a much more efficient, usable and cost-effective manner. > I doubt nowadays that it reproduce the phase coupling that the tuner > is initially after, did you experiment on that side of the process ? > > I still don't understand if you use a tension reserve in the string to > bring it to pitch , or is the string warmed to correct pitch (that > induce changes in iH I guess, how much I don't know, but a 35 °string > is toning softer than a 20 ° one) . Since the piano is factory-tuned at an elevated temperature, it will go sharp when allowed to cool to room temperature. This is the reserve tension. > Have you experienced for curiosity, on the spectra changes with the > heat ? No, not with a spectrum analyzer anyway. 95 F is just not that warm. I can tell you that I can detect no differences in the sound. It just sounds like a newly-tuned piano. I might also mention that I'm not just a "gearhead". I studied piano at the UMKC Conservatory of Music (formerly the Horner Institute) for sixteen years and have played piano for nearly 32 years. Don A. Gilmore Mechanical Engineer Kansas City > Best Regards. > > Isaac
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