digital control of analog component question...

[jhaible]

> I've been thinking about DCOs for a polysynth design.
> For true analogueness I want to avoid using digitally created waveforms,
and
> also to allow the period of each cycle to be altered after the cycle has
> begun.
>
> The Juno 106 has a neat trick for creating it's waves. A timing capacitor
is
> charged at a rate set by a DAC that is approximately right for the osc
> frequency, but the reset pulse for the cap comes from a digital timer.
> This gives a smooth 'analogue' ramp, with a precise digitally controlled
> period.

... the latter being the ruin of the analogue sound. Unless you're going for
a
1 osc / voice instrument.

JH.