Changing Harmonicity

[Bernhard Stopper]

Hello Ric,

All spectral measurements i have done on instruments with a spectrum
analysator haven´t 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
>
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