[music-dsp] "octave up" algorithm?

Jens Groh jens at optimolch.de
Wed Apr 16 11:55:39 EDT 2008

What about this:

Delay the signal by half the period duration and add it to the  
original signal.

To do this, you will need a pitch tracker to determine the fundamental  
frequency (=1/period) and a delay line with variable delay time.

Regards, Jens Groh

Am 15.04.2008 um 16:33 schrieb Kevin Dixon:
> I'm wondering if anyone knows of any guide or information on how to  
> do an
> "octave up" effect? I only have experience dealing with filters so  
> far...
> Specifically, I'd like to implement a plug-in similar to the MaxxBass
> http://www.waves.com/content.aspx?id=327
> Which I like to use in my mixing of drums, tuned to the fundamental  
> of the
> bass/kick drum. However, I can't afford a maxxbass :)
> What the MaxxBass does, is you specify the fundamental, and then it
> duplicates some of the frequency band about an octave up to make  
> things
> seem bassier.
> Any advice would be appreciated.
> -Kevin Dixon
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