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Posted by Steve King on 06/14/06 03:46
"Frank" <frank@nojunkmail.humanvalues.net> wrote in message
news:e89u82hnk75glnf3a16qhib0les1egr36g@4ax.com...
SNIP
>
> Just for the record, the audio file linked to from The Register
> article, although having a .mp3 extension, isn't actually MPEG Layer 3
> encoded.
>
> It's actually an MPEG-1 Layer 2 file and should really have a .mp2
> extension.
>
> I think that the fundamental is higher than 15 kHz though; perhaps
> more in the neighborhood of 16 kHz, but I don't have the time for a
> more thorough analysis.
>
> Like Steve, I too was able to hear it using just my usual setup of JBL
> monitors driven by a Crown amp, let along through electrostatic
> headphones, and I'm not exactly a spring chicken any longer. :)
>
The freq. could be higher. I have no way of knowing how accurate the
spectral view in Audition is, and I no longer have bench equipment that will
let me know. However, the stuff I wrote earlier about FM modulation was
wrong upon further examination, a product of the way the spectral image is
formed I suspect, since that's currently my only tool. I think it is a
simple 15 kHz +/- sine wave. Could this be what the news stories are
talking about? I expected there to be some buzziness to it.
Steve King
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