[sdiy] wanting "good" envelopes, not "bad"

[Byron G. Jacquot]

At 02:15 PM 06/12/2002 -0500, you wrote:
>> Zipper noise is probably the biggest problem I can think of.  In order
>> to keep the zipper noise down, you with either need a high sampling rate, or
>> a filter.
>> 
>
>I was thinking about trying a hardware envelope generator with a digital
>integrator. If we use a 12 bit counter feeding a DAC, we get 2.4 millivolt
>steps. That's 3 cents per step driving a 1 volt per octave input over 10
>volts.

You might also check out the envelopes in the PAIA fatman, they're the
opposite of this.  IIRC, it uses analog integrators, with some comparators
feeding back to the microprocessor, indicating when the thresholds have been
met, so the micro can switch to the next segment.

Byron Jacquot