[sdiy] Additive Synthesis - phase shifts important??

[harrybissell at wowway.com]

Rectifying a square (or pulse)wave gives you DC...  ;^P

H^) harry




On Mon, 14 Jul 2008 16:11:06 +0100, cheater cheater wrote
> I'm pretty sure that even a constant phase-shift will give you a
> noticable change in the timbre.
> 
> But even then, consider the fact that the signal will overdrive
> differently. Just put a square wave through a rectifier - you still
> get a square wave. If you put the square wave shifted by Pi/2 (so an
> 'arc sin wave') you will get something very different, that would 
> look more like an exponentialized trapezoid wave.
> 
> Cheers
> 
> On 7/14/08, Florian E. Teply <usenet at teply.info> wrote:
> > Jim Patchell schrieb:
> >
> > > Your ear cannot tell what the phase relationships between various
> > harmonics...however, your ear is very sensitive to a "change" in the phase
> > relationship.  Being able to dynamically change the phases as a function of
> > time would rate very important to me...(not sure if I am going to add that
> > capability to my additive synthesis project or not...).
> > >
> > >
> >  Well, it's not that big a step from user-controlled constant phase shift to
> > user-controlled variable phase shifts, in the DDS sheme it would break down
> > to adding external data instead of internal (to the DDS module) data, so
> > simply connecting some more wires to the outside instead of generating that
> > data on-module from knob positions, CVs or whatever.
> >
> >  Will probably generate some graphics on the general idea as soon as my last
> > exam is finished (thesis is due next monday)...
> >
> >
> >  Greetings,
> >  Florian
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Harry Bissell & Nora Abdullah 4eva