[sdiy] Phase shifts and instantaneous frequency

[Ian Fritz]

At 04:47 PM 7/15/2008, Aaron Lanterman wrote:

>If I imagine that somewhere in my auditory system, a 100 Hz wave and a
>201 Hz wave are being multiplied, then I get sum and difference tones
>of 301 Hz and 1 Hz.

???? ... I get 201-100 = 101 and 201+100 = 301.  How do you get 1 Hz?

The 1 Hz modulation comes from beating of the 101 Hz and 100 Hz signals.

I have read that the nonlinearity in the ear is simply the asymmety in the 
eardrum.