50kHz pitch shifter

[Toby Paddock]

Thanks to all for the response to my pitch shifter question.

Some fluid is bombarded by 50kHz sound energy 
and monitored by an ultrasonic pickup. 
The pickup sees the 50kHz and also higher frequency 
from cavitation and such. 
The interesting frequencies may go up to 500kHz.

RING-MOD:
What was I thinking? I knew ringmods destroy harmonic 
harmonicness, but for some reason didn't connect that 
to this. But maybe that's OK. If there is an interesting 
ringing frequency, say at 500kHz, then a carrier of 501kHz 
might work fine. It wouldn't sound anything like the original 
waveform slowed down, but maybe that's OK too. AD633 it is.

SLOW IT DOWN:
We were thinking digital o-scope, to pc, and play back slow. 
Something like a 5 MHz sample rate. Grab one cycle of the 
50kHz, send it to the pc, play it back 100 times slower, and 
do it again. But that means doing the whole process 
500 times a second. Now I wonder about grabbing a cycle, 
play it back 500 times slower (100Hz) and play that same 
cycle maybe 10 times. Then do it again. Might sound a little 
chunky, but it gives a rep rate of only 10 Hz.

Again, thanks for the time and brainwidth.

 - -- -  Toby Paddock