In reply to:
In fact, it still amazes me that a woofer can reproduce two or more frequencies simultaneously with reasonable fidelity.
The same thing I realized when I first started with digital audio theory on the C64 (wow, 40K of BASIC memory, with more under ROM? I can have an 8 second digital audio clip at 4000 samples per second, 4 bit resolution, holy cow!
The first time it occured to me that a 50-50 mix of two digital audio streams is a mathematical average of the two:
x=(a+b)/2
... it blew my mind... mix in 8 different signals and you should get mud, not a fine audio signal! Made me interested enough that I built a quick and dirty audio digitizer around a 0820 ADC, worked very well except the source had to be a DC walkman or similar (since I didn't build in any sort of ground isolation, it would hum like a bugger otherwise)
Bren R.
