John, If this is true and it well might be, why does not the pitch drop more when the third string is added. Joe Goss imatunr@primenet.com http://www.primenet.com/~imatunr/ ----- Original Message ----- From: "John Meulendijks" <jmjmeulendijks@planet.nl> To: <pianotech@ptg.org> Sent: Monday, February 19, 2001 3:22 PM Subject: Re: ETD question re: unisons > First I have to admit: I cannot keep up with all the messages. So maybe this > is already stated: > One string brings in an amount of energy to the soundboard. The fixed end is > not a fixed end anymore. So the actual length of the string should be > slightly enlarged to calculate the strings frequency out of it. > Now three strings in unison bring their energy to the soundboard. I presume > this is more mass, more energy. The 'fixed' end on the bridge is even less > fixed. If this is true, than the amplitude of the 'fixed'spot is bigger, > thus the corresponding additional calculating length is bigger. Thus the > resulting tone lower. Why should it occure in the upper middle and lower > treble side? Because this is the spot where the central area of the > soundboard is, and pressue........., and string tension........ etc. > > true? > > John Meulendijks > Tilburg > the Netherlands > > ----- Original Message ----- > From: Richard Moody <remoody@midstatesd.net> > To: <pianotech@ptg.org> > Sent: Monday, February 19, 2001 3:50 AM > Subject: Re: ETD question re: unisons > > > > > > > > ----- Original Message ----- > > From: Michael Jorgensen <Michael.Jorgensen@cmich.edu> > > To: <pianotech@ptg.org> > > Sent: Thursday, February 15, 2001 4:05 AM > > Subject: Re: ETD question re: unisons > > > > > > > Many individual strings can full blush for several > > > seconds (be very close), only to suddenly register flat-- a whole cent > flat > > for > > > a brief instant and suddenly return to full blush. Could the soundboard > be > > > forcing/imposing a frequency against the will of the string and simply > winning > > > the battle for a second or less? > > > -Mike Jorgensen > > > > > Of course the sound board is vibrating along with the string(s) And the > bridge > > in between also. But let us not forget that ETD's like all measuring > machines > > have limits. At one point in our investigation we have to ask the > question, > > what are the limits, are we at the limit?. > > Another consideration that has not been addressed is that ETD's do not > > actually measure the vibration rate of strings themselves. They give us a > read > > out of what the microphone is picking up from sound vibrations excited by > a > > soundboard excited by piano strings. AND some are converting to digital. > It > > would be interesting to see if magnetic or ceramic pickups gave the same > or > > different readings. > > This gets to the determiniation of the accuracy of the instrument. > If two > > instruments (of different design) always give the same reading it is > reasonable > > to assume the readings are "true". This begs the question, "how do the 3 > ETD's > > (RCT, SAT, and TL (TuneLab) read a unison then a single string of that > > ison? ---ric > > > >
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