Re: [Phys-L] non-linear ears.

[Brian Whatcott <betwys1@sbcglobal.net>]

 There was a time and place where universities were sprinkled liberally on the landscape; where the faculties were warm and welcoming.At one of those places I was pleased to be shown some experiments on characterizing musical instruments. I noted that a little spark plug was installed on (I think ) a trumpet.  The rich audio spectrum available from a short spark, and its  consequent harmonic and anharmonic components were described by a Dirac delta (improper) function.
    On Friday, November 13, 2020, 08:46:34 PM CST, bernard cleyet <bernard@cleyet.org> wrote:  
 
 

> On 2020/Oct/30, at 08:29, Paul Nord <paul.nord@valpo.edu> wrote:
>
>
> What's interesting is that the standard hearing test you might get from a
> doctor only goes up to 8 kHz.  They apparently don't consider hearing loss
> above those frequencies to be important.
>
> Paul



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Which angers me.  

There was a porous white cylinder in the plastic tube between the aid and the tubing to the ear mold in my system.  I thought it was a liquid block.  Not!  But A low pass filter!  I removed it and now can hear clock ticking and other high frequency sounds.  Also, tho the majority of voice is below 8k Hz, I’ve found a little better comprehension W/O the filter.  

bc  …  being an amateur horologist, is pleased;  likely can now hear crickets, also


Project:  Use the recently acquired Vernier sound sensor and Logger Pro’s included FFT to characterize clock ticks.
 
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