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From: Steve Underwood on 6 May 2008 20:12
Greg Berchin wrote:
> Scott Hemphill wrote:
>
>> This link is supposed to be such a sample. It's at 32kHz mono.
>>
>> http://audio.cbsnews.com/2006/06/12/audio1701350.mp3
>
> I analyzed the sample. It's an almost pure sinewave at 15kHz,
> amplitude approximately �3500, with a short starting and ending
> transient. When I played it, I experienced a sensation something like
> hearing, but more like "being aware". Meanwhile my dogs not only left
> the room, but exited the house and sought refuge in the back yard.

Surely you heard the low pitched part, at something like 180Hz, and not
silence? I was surprised to find that at 53 I have no problem hearing
the 15kHz whistle. Looking at the spectrum, the amplitude of the 15kHz
is far above the amplitude of the 180Hz, but I was still surprised to
hear it.

Steve
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