Tor Olav Kristensen wrote:
> Invisible wrote:
> ...
>> My first instinct is "how the hell do you compute signal correlation 
>> without a computer?" but now I'm thinking maybe you can do it with 
>> some op-amps.
> ...
> 
> http://google.com/search?&q=(analog+OR+analogue)+computer

Oh my God, check it out:

http://en.wikipedia.org/wiki/File:AKAT-1.JPG

Funkalishous, baby!


But yeah, I was thinking that splitting a signal into pieces and 
computing a step-wise correlation would seem to require digital 
electronics. But it doesn't really. You could probably wire up a system 
that has a meter showing the instantaneous correlation between two 
inputs without much difficulty. (And the spring in the meter will 
probably smooth it out quite nicely.)

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