[sdiy] Beat tones, Fourier analysis, and nonlinearities in the ear [was Phase shifts and instantaneous frequency]

[Aaron Lanterman]

On Jul 16, 2008, at 5:50 AM, cheater cheater wrote:

> It's actually 0.5Hz.
> Look at the picture carefully.

I should clarify. If you have a signal modulated with a 1 Hz sinusoid,  
your eye won't really be able to detect which part of the wave is  
going positive and which is going negative. So it will visually look  
like something with two cycles per second.

Ian just posted a pretty thorough note on this which I need to go over  
and think about. There's excellent food for thought there that is  
making me rethink things.

- Aaron