SV: Re: [sdiy] Required sample rate for digital envelopes and LFOs

[karl dalen]

--- Bruce Duncan <modcan at sympatico.ca> skrev:

> 
> >
> >
> >So there you go. 523Hz is 'really fast' according to at least one
> >important and influential figure in synthesizer design. The MSR2 and
> >Prosynth envelopes are both notoriously lazy, but at a rate of
> >50-60Hz, I'm not surprised.
> >
> >Regards,
> >
> >Tom
> No wonder digital envelopes have a reputation for being sluggish.
> On the other hand you can see the level of resources required for the 
> 40uS sample rate on the envelope you recently coded for the Modcan Quad EG.
> A dspPIC uC running at 15MIPs written entirely in assembler with 
> 12bit output and quad serial DAC
> On a synth like the Matrix 12 it would have cost 4 times as much to 
> maintain that level of speed and the power supply requirements would
> have been enormous. Never mind the fact that the cost of equivalent 
> components in the 80s would have been very high if available at all.

In the old days many ENV's where just software counters, to get faster
rates they skipped count bits wich made them go faster but also it
became coarser, but the ear and brain have a tendency to mask out
steps to a certain degree.

KD


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