50kHz pitch shifter

[Martin Czech]

A related question:

When astronomers started observation out of the visible band of light
(ie, infra red, radio, gamma etc.) they detected a whole new universe.

Now, would that be true for sub and super sonic?

It would be interesting to hear, what super sonic noise is on the
streets...

I've heard of people recording sub sonic phenomena (water level of a lake)
and play that back with higher speed. This is no problem, but some kind
of DC sampling device is needed (most audio ADC are sigma-delta and have
a zero at DC...)

And I've heard about people recording bats. Now , tape recorders are made
for the audio band, they will not work. Same applies for most sampling 
technology. Frequency shifting will destroy harmonic relationships.

Any ideas?

May be it turns out, that it is all boring.

Another source of interest may be stellar sound sources (base band or 
modulated).

http://www.marsmicrophone.com/pulsarsounds/crab.html

I'm also looking for some nice radio galaxies...

m.c.