Strictly speaking, PWM only makes sense if the signal is a pulse
wave.
But in Physical Modelling, there's something I cannot help but describe
as "PWM of an arbitrary signal", because it ∗sound∗ just like that:
In PM, you have a Resonator (string, air column etc.) modeled by
complex delay line + filter combination.
If you choose a string, for example, you can "pick" that string at
different locations along its length.
The SX WSA-1 synthesizer can modulate this location with
an LFO, and this really sounds like "PWM of a non-pulse signal".
(that's a great feature the WSA-1 has over the Yamaha VL line.
This and polyphony. Other than that, the VL's are better.)
Back to analogue: With the Interpolating Scanner you can set
up a polygon waveform and modulate this back and forth.
This can also sound like PWM on a non-pulse signal.
JH.
-----Urspr�ngliche Nachricht-----
Von: drg3orge <
doc@...>
An: <
motm@yahoogroups.com>
Gesendet: Donnerstag, 6. M�rz 2003 03:36
Betreff: [motm] pulse width...
> h3y all,
> is there a way to manipulate the duty cycle {for lack o' a better
> term} of ∗any∗ audio signal??? CD, guitar, wife's flute, etc? was
> thinkin' 'bout static waveforms an'timbre/pulse width modulation
> while doin' the dishes an' had never considered the possibility about
> tweakin' the duration of the 2 halves of a waveform.
> does this make any sense? is it a stupid thought with no answer?
> is it possible to achieve??
> thanks,
> doc
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