[sdiy] Phase shifts and instantaneous frequency

[Ian Fritz]

At 11:19 AM 7/16/2008, Dave Krooshof - dendriet.nl wrote:
>"And if you present the signals separately to the two ears you don't hear 
>the beats, either."
>
>Yes, with frequencies between 1 and 2 KHz you do. There's a special nerve 
>'knot' just to do that. The frequencies do not appear in air, and if you 
>make a theremin, you'd need a multiplier, not an added just to obtain the 
>beating frequency. But between 1 and 2 K, your nervecells are happy to do 
>this for you.

Dave --

Thanks!!!  I just set that up, and indeed I do hear the timbre variation 
with the separated signals.  I've been wondering what could be wrong all 
morning.  The literature I was going by must have been refering to higher 
frequency combination tones.  So you are saying this is a kind of nonlinear 
processing in the brain?  Wow.

   Ian