[sdiy] Dumb PWM question
Stromeko at nexgo.de
Wed Feb 27 20:28:18 CET 2008
On Dienstag 26 Februar 2008, jbv wrote:
> well, the result might sound awfull, that's a possibility...
> but PWM on square waves sounds good, so may be it's worth a
> try with other waveforms and "natural" sounds as well...
"PWM" on a triangle/saw waveform is musically useful. However the
triangle wave is too sine-like, so the perceived loudness through
modulation is changing quite a bit if the ampliztude is held
constant. When I made a wavetable for the KOMPLEXER VST for Saw PWM I
also added another one with spectral enhancement so that the triangle
wave actually is a polynomial shaped waveform.
I've also written up some notes on how to control an integrator VCO to
provide saw - triangle - reverse saw modulation, but it never made it
This time compression/expansion thingy you mentioned should in principle
work if you start with the expansion part (filling up a scannable delay
line with the not-yet needed samples) and then compress until you again
reach the beginning of the delay line. To do this synchronized to the
frequency however requires additional delays of minimum one period or a
priory knowledge of the frequency of the input signal. You should
quite likely remove the DC component that is an almost inevitable
result of doing it like this.
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk]>+
SD adaptation for Waldorf rackAttack V1.04R1:
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