Petrof Inharmonicity

[Frank Weston]

Varying the inharmonicity from zero to what is typical for a piano on a
tone generator is not exactly like comparing a low inharmonicity piano to
one with high inharmonicity.  What you propose is analogous to calculating
the average speed of a bullet by considering the time it takes to load the
pistol.

Frank Weston

----------  
> From: Stephen Birkett <birketts@wright.aps.uoguelph.ca>
> To: pianotech@ptg.org
> Subject: Re: Petrof Inharmonicity
> Date: Wednesday, March 04, 1998 3:49 PM
> 
> Alex wrote:
> > This was demonstrated in 1987 at the Acoustical Society of America
meeting
> > by Reinholdt et al., but I am not agree with that completely. The tone
will
> > change not because of the B change only, but also because of the change
of
> > the spectral bandwidth that correlates with brightness of the tone.
Change
> > of B in a 50-partials tone in across-piano limits for a bass region
might
> > change spectral bandwidth twice or more. 
> > 
> If B is varied in such an experiment and tone perception changes then the
> change in B is responsible for that tonal difference. The mechanism may
be
> explained by a change in spectral bandwidth as described above....but the

> change in inharmonicity is ulimately responsible for the tonal
difference.
> 
> Stephen
> 
> Stephen Birkett Fortepianos
> Authentic Reproductions of 18th and 19th Century Pianos
> 464 Winchester Drive
> Waterloo, Ontario
> Canada N2T 1K5
> tel: 519-885-2228
> email: birketts@wright.aps.uoguelph.ca
>