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To: techdiver@opal.com
Subject: Mixedgas effect on speech
From: prapbm@er*.er*.se* (Praktikant Peter Bergstrom)
Cc: SCUBA-L%BROWNVM.BITNET@SE*.SU*.SE*
Cc: prapbm@er*.er*.se*
Date: Fri, 29 Jul 94 15:10:47 +0200

Hi.

Does anyone know what cause the scrambled speech, when
you breath with some mixedgas under pressure? Hint: The
scrambling of the speech increase with the depth ...

My theory about this effect is when you talk with mixedgas
in your lungs, the vocal cord in the throat works faster
due to the lower density in the gas. Which result in a
frequency increase in the speech. When the surrounding
pressure increase you inhale more low density gas ....

It this a correct assumption, or could someone correct me 
in this problem ?
Is it just a frequency increase in the speech?, if so
what is the frequency band at different depth, is it a
linear function. (as the volume/pressure formula)

What can I do to fix this problem?.
Is it possible to just perform a "down sampling" of
the signal. Just do a switching of the sampling rate every 10 
meters or something. 

Or does it exist any solution to this problem?, if so
does they work analogue or digital. Does anyone have a 
wiring diagram, on such a "descrambler" ?
Or is it possible to buy such a gizmo, how much, where,  etc.?

Thanks.

/Peter

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