Re: Bite-induced pitch shift?

[Bob Masta <masta@xxxxxxxxx>]

The fact that beats slow down fits with the idea that the received frequencies
are changing, perhaps by a shift of the basilar membrane.  To make a
simple example, if the original tones were 100 and 110 Hertz you would
get a 10 Hertz beat.  If everything shifts down by 10% to 90 and 99 Hertz
you would get a 9 Hertz beat.  A constant percentage shift implicates a
linear shift of the activation areas of the basilar membrane, but it's not
obvious that the clench-applied tension would give this result.

A percentage shift would produce bigger absolute differences between
harmonics than between fundamentals, so that may explain your
results there.




On 11 Jul 03, at 20:52, Thomas G Brennan wrote:

> Having generated various pure tones I have found, at least for me, that beats
> tend to slow between pure tones when I clench my jaw.  However, if I add
> harmonics I believe what is happening is that beats related to the tones used
> (partials) tend to speed up and these latter sets of beats either break up into
> nonsense beats or become so fast that I cannot count them.
>
> 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

         D A Q A R T A
Data AcQuisition And Real-Time Analysis
 Shareware from Interstellar Research
        www.daqarta.com