[sdiy] Harmonic bandwidth

[Ian Fritz]

At 10:45 AM 1/9/2008, Jim Palmer wrote:

>is it possible to get frequency distortion in a speaker??
>i'm hearing this one as a tiny pitch change

There *can* be frequency distortion from the Doppler effect -- a low 
frequency signal can modulate the pitch of a higher frequency one.  I have 
no idea whether this could be playing a role.  And as pointed out before, a 
speaker could be asymmetric in its response.  But I think you should try 
moving your head around while playing one of your waveforms back and see if 
the changes in timbre are similar to what you get when you switch 
waveforms.  Also  -- from psychoacoustics we know that small pitch changes 
and small timbre changes can be confused.

Interesting stuff!

Ian