COMPA and COMPC for inverted pitch shifts?

Algorithm development and general DSP issues

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seancostello
Posts: 74
Joined: Mon Sep 11, 2006 10:04 pm

COMPA and COMPC for inverted pitch shifts?

Post by seancostello »

Hi all,

I'm trying to get the most bang out of my pitch shifting code, for detuning operations. Can I use COMPA and COMPC in my cho instructions to get pitch shift happening with the opposite amount of pitch shift?

Thanks,

Sean Costello
frank
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Joined: Wed Oct 19, 2005 12:26 pm
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Post by frank »

No, it doesn't work like that. The COMPC calculates 1-coeff for interpolation and the COMPA is to calculate the 180 degree shifted ramp. The speed of the ramp is what controls the actual pitch shift amount, it moves the read pointer faster or slower through memory relative to the write pointer.
Frank Thomson
Experimental Noize
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