[music-dsp] filtering harmonics ( was Hi list -- some questions )

[David Lowenfels]

How about filtering a harmonic with a notch filter?
Or if you want multiple harmonics, try a notch comb-filter.
A notch comb filter can take out all the even harmonics, leaving only 
odd harmonics (square wave). It's the frequency domain equivalent of 
subtracting two sawtooths to get PWM.

-David

On Mon, 2003-05-12 at 15:16, Michael Rempel wrote:
>  Try filtering odd order harmonics a bit.
>
Hi,

Is there any chance you might lead me to some information on how to
filter harmonics? Obviously low pass filtering will do that, but than
you lose the rest of the information.

Hmm.

Possibly you could attenuate certain harmonics though with a shelf/peak
filter. I can see how that could be done. Than if I want certain
harmonics emphasized I can do it.

A sawtooth has every harmonic in it going down by a factor of 1/n where
n is the harmonic. It's spectrum looks like a curve going down as the
harmonics increase.

-- 
_/^\_/^\_/^\_/^\_/^\    Science is but a perversion of itself unless
   David Lowenfels       it has as its ultimate goal the betterment
  Vibrational Engineer   of humanity. -- Nikola Tesla
^\_/^\_/^\_/^\_/^\_/^            http://www-ccrma.stanford.edu/~dfl/