Hi Bernhard I have to admit I'm on foggy ground here, not having read any much on the subject for a while and having little direct experience with this myself. But I remember we had quite a few discussions about the subject matter and that we (many of us) ended up differentiating between what is strictly <<string inharmonicity>> and the inharmonicity of the instrument as a whole. The soundboard assembly gets into the picture as well as hammer hardness/density... tho as I said I am hesitant to make any declarations as to specifics until I can re-dig up some of the articles and discussions. Tho I do believe things are a bit more complicated then just plain "string inharmonicity" Cheers RicB Bernhard Stopper wrote: > Hello Ric, > > All spectral measurements i have done on instruments with a spectrum > analysator havenīt shown any difference in the offsets of the frequencies of > the spectrum. (of course the amplitudes for every frequency are strongly > affected by different hammers) > > If there is a difference in the inharmonicity measured by the verituner > that differs with different hammer blows, it would be interesting to know > how the verituner calculates the measured inharmonicity (what frequency is > taken into account? what part of time is taken into account?). > It is knwon, that with very strong hammer blows the overall pitch raises up > a little, but in that case all other frequencies are raised also, so > inharmonicity (the offset between them) is not affected. If the verituner > calculates the inharmonicity by a match of frequencies to some reference > frequencies, there may be of course a difference in the result of its > measured values, caused by the (short) pitch raise. > > regards, > Bernhard > > ----- Original Message ----- > From: "Richard Brekne" <Richard.Brekne@grieg.uib.no> > To: "Pianotech" <pianotech@ptg.org> > Sent: Thursday, March 04, 2004 11:44 AM > Subject: Re: Changing Harmonicity > > > >>Bernhard Stopper wrote: >> >> >>>I agree with Ron O. >>> >>>One should not confuse "Harmonicity" (what is not defined as a physical >>>parameter) with Inharmonicity. >>>Inharmonicity is definded as the offset of the harmonics by the effects > > of > >>>the stiffness of the string and is therefore not dependent of the > > hammer. It > >>>has nothing to do how "harmonic" impression that different hammers > > produce > >>>by enforcing or damping different partials. >>> >>>Bernhard Stopper >>> >>> >>> >> >>Defined such there is of course no argument, and Ron O is correct as >>Bernhard points out... by definition. >> >>Yet there is measureable divergence from this apparently having to do >>with the condition of the moment of excitement. That, if true, cant be >>overlooked either.... tho perhaps a definitions of terms are in order >>for any such discussion. >> >>Cheers >>RicB >> >>_______________________________________________ >>pianotech list info: https://www.moypiano.com/resources/#archives > > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives >
This PTG archive page provided courtesy of Moy Piano Service, LLC