[sdiy] Polyevolver internals

[karl dalen]

2009-12-30 skrev Antti Huovilainen <ajhuovil at cc.hut.fi>:
> > Related is the fact that DCOs can easily generate sync
> waveforms without aliasing, which is *hard* to do with
> digital oscillators;
> 
> Not really, as long as you're not using more complicated
> waveforms than saw/pulse/triangle (and if you are, then you
> can't use normal DCO either).

You say *not using more complicated* why cant he use a normal
DCO either? Sure he can. Roland did and so DSI!
 
> > DCOs have a relatively low processor overhead, since
> you only have to deal with a timing reset pulse once per
> wavecycle instead of dealing with generating a new sample at
> x KHz. That leaves you time to do modulation processing on
> the same chip.
> 
> Which you can do even if you have digital oscillators
> running on the same chip. DCOs can't be audio rate
> modulated, 

If a update of a shape CV comes just behind a NCO frequency update 
and as long as Mux chain are fast i dont se why not? The whole hoopla
is linear but a LUT will do i suppose. Direct AM of integrator is no
problem, have tested and that counts as audio mod . 

KD


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