Re: Bite-induced pitch shift?

[Thomas G Brennan <g_brennantg@xxxxxxxxxxxxxxx>]

In part, it may have to do with perceived resonation properties.  I tend to
suspect that the major cause is tightening of the eardrum and alteration to the
size of the outer and middle ear spaces.  Since I wrote my original response to
this question I have done a few experiments with a piano.  As a tuner I have
experimented with hearing beats while setting a tempered octive.  When clenching
my jaw I tend to either completely lose the beats I can normally hear or they
sound as though they have nothing to do with the actually notes usually being
far faster than would be expected for the pitch change.

Tom


Tom Brennan KD5VIJ, CCC-A/SLP R/D - AU
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html

On Wed, 9 Jul 2003, Bob Masta wrote:

> Date: Wed, 09 Jul 2003 08:47:45 -0400
> From: Bob Masta <masta@UMICH.EDU>
> To: AUDITORY@LISTS.MCGILL.CA
> Subject: Re: Bite-induced pitch shift?
>
> Tom:
>
> Thanks for your observations on pitch shift.  I'm curious why a shape
> change of the external auditory canal should be implicated.  Does
> this effect only apply to broadband signals, such that changing the
> canal's resonant frequency might give a "formant" change in the
> spectral shape?  I can't see how it could change the pitch of a
> pure tone, unless the basilar membrane is also deformed somehow.
>
> .
>
>
> On 8 Jul 03, at 17:42, Thomas G Brennan wrote:
>
> > I neglected to say that this seems to be caused by alteration to the shape
> > and/or position of the external auditory canal by the mandibular condyle.
> >
> > Tom
> >
> >
> > Tom Brennan KD5VIJ, CCC-A/SLP R/D - AU
> > web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html
>
>
> Robert Masta
> tech@daqarta.com
>
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