Roger, Thanks for sharing, sounds like an interesting study. I hope I'm still around when you publish. Good luck. Mike ----- Original Message ----- From: Baldwin Yamaha Piano Centre <baldwin@mta-01.sk.sympatico.ca> To: Mike and Jane Spalding <mjbkspal@execpc.com>; Pianotech <pianotech@ptg.org> Sent: Tuesday, September 17, 2002 5:20 PM Subject: Re: Measuring Sustain and Power: was The Steinway Bell Patent > Hi Mike, > I have developed a key thumper, that has variable > height, and variable mass. This gives me control of the acceleration. I > am tying the partial amplitude and sustain time, to force, and > acceleration. With some promising preliminary results. > > Calculating the RMS values of each partial, and then integrating the > series, is starting to also show some promise. > > Research is in it's early stages. And results at this time are > confidential. But I can say that results are re producible to within 15% > margin of error. > The key was getting consistent mass and acceleration of the key > thumper. Affectionately nicked named the 'Jolly Thumper' > There are so many variables to the harmonic series, that is associated > with, dwell time, energy transfer, etc. I think I will be a very old man > before I figure it out. > > Regards Roger > > > At 04:46 PM 9/17/02 -0500, you wrote: > >Hi Roger, > > > >My fault, I guess, for phrasing the question in Yes/No format. Can you > >elaborate? Were the results repeatable? Did they make sense? Were they > >useful? Please tell us your story. > > > >thanks > > > >Mike > > > >----- Original Message ----- > >From: Baldwin Yamaha Piano Centre <baldwin@mta-01.sk.sympatico.ca> > >To: Mike and Jane Spalding <mjbkspal@execpc.com>; Pianotech > ><pianotech@ptg.org> > >Sent: Tuesday, September 17, 2002 3:46 PM > >Subject: Re: Measuring Sustain and Power: was The Steinway Bell Patent > > > > > > > At 12:26 PM 9/17/02 -0500, you wrote: > > > >Dave, > > > > > > > >I've never done this, nor heard of anyone else, but it occurs to me that > > > >some combination of a calibrated hammer blow (maybe the tuning stability > > > >test blow of 8 oz. dropped from 6 inches?), and one of the ETD's that > > > >measure volume and sustain, such as RCT's Pianolizer or TuneLab, might > > > >work. Anyone ever do this? > > > > > > Mike > > > Yes. > > > Roger > > > > > > > > > > > > >_______________________________________________ > >pianotech list info: https://www.moypiano.com/resources/#archives > > Roger > > >
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