SV: [sdiy] Mopho modulation DAC configuration, update rate, etc

[cheater cheater]

Check out D-CAM Synth Squad, they have audio rate FM on DCOs.

D.

On Sat, Feb 6, 2010 at 13:23, Tom Wiltshire <tom at electricdruid.net> wrote:
>
> On 6 Feb 2010, at 08:38, karl dalen wrote:
>>
>> Offcourse but there are basically no *modulation* frequency
>> limit within the PA397, it can go into audio frequency range
>> if one designs it in.
>
> If the Mopho uses the same DCOs as the Prophet08, then I disagree, Karl. I
> might be wrong (happened lots before) but I don't see how you can do audio
> rate FM on a DCO.
> Some people have argued that you can update the charging rate in the middle
> of a cycle without causing a glitch, by doing some recalculation of when the
> reset point would be, but I'm rather sceptical that it can be done
> accurately. And FM is the absolute worst-case, where you're changing the
> charging rate many thousands of times during a single cycle (48KHz sample
> rate would be a minimum for half decent FM). If you don't have some errors
> built up by the end of that, I'd be amazed.
> Delighted, but also amazed.
>
> Aside from the DCO, he's got an analog filter and VCA in there, so he can do
> audio FM on those, no problem.
>
> T.
>
>
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