15 Jun
2016
15 Jun
'16
7:46 a.m.
Simple square wave patch into a [vcf~] and a [bp~]. Pass though 6-stage [lop~ 8000] to try to eliminate harmonics > nyquist (22.5khz). (attached).
Set the Q to about 3. Now keep the frequency of the oscillator and the filter cutoff freq below 100 hz.
Try [bp~] then try [vcf~].
No matter what the setting of either (as long as they are both below 100 hz), I get I get a strong artifact at 4k, another at 12k, another at 17k.
This has been bugging me for months. I can't figure it out.
I thought it was super-Nyquist foldover, but the [lop~] didn't eliminate it, and it does not seem dependent on the frequency of the oscillator.
Any ideas?
Sample rate=44100 hz. Delay= 80 ms. Blocksize=64. *Pd 0.46.7 on Windows 7. *
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