[pd] 100000hz+

Mathieu Bouchard matju at artengine.ca
Thu Oct 26 13:18:53 CEST 2006

On Thu, 26 Oct 2006, hard off wrote:

> i just made a synth which makes some really nice tones when i feed it 
> really high frequencies.  (midi notes 150-300) question is, will this 
> sound the same on all computers, or do different systems handle such 
> high frequencies differently?

Every change in your soundcard's sampling rate will make a tremendous 
difference to how it sounds. Everything that you do with frequencies that 
high rely on a moiré effect between the sound and the sampling itself.

Putting all your oscillators in a subpatch with a set downsampling or 
upsampling will shield you from some of the variability from soundcard to 
soundcard, because 48 kHz and 96 kHz are a power of two away. However, Pd 
doesn't allow you to correct the difference between 44.1 kHz and 48 kHz, 
because it isn't a power of two; and generally speaking, because 44.1/48 
simplifies as 147/160, any resampling between those two frequencies will 
be difficult (because it isn't an easy fraction to deal with).

  _ _ __ ___ _____ ________ _____________ _____________________ ...
| Mathieu Bouchard - tél:+1.514.383.3801 - http://artengine.ca/matju
| Freelance Digital Arts Engineer, Montréal QC Canada

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