[sdiy] Filter cut off DAC

[paula at synth.net]

Veronica,

> 12 is a good number in terms of control and cost. If you were to go to
> 16 you not only have the cost of the DAC but the cost of making the
> signal path from the DAC match that level. Not too bad at 16 bit but
> the costs rise.

totally agree.

> So what do you want to do that might push the design goal above 13 bit?

Just thinking, if you add an EG to an LFO and a few other modulation 
routings I wonder if 12 bits is enough to keep things sounding "smooth".

Paula


> 
>> On May 21, 2018, at 12:40 PM, paula at synth.net wrote:
>> 
>> Scott,
>> 
>> Thanks, I should've said, I'm more thinking in terms of things like 
>> ADSRs/LFOs, etc
>> 
>> Paula
>> 
>>> On 2018-05-21 16:30, Scott Gravenhorst wrote:
>>> Going from my FPGA experiences, I'd say 10 or 12 is a good starting
>>> point if not a
>>> good end point.  I used a 12 bit DAC and it made good quality audio
>>> (when the level
>>> used all 12 bits of resolution).  A VCF would probably not even need 
>>> 12 bits of
>>> cutoff resolution IMO.  MIDI uses 7 bits of resolution for most
>>> things, which can
>>> be a tad low for some things, but for filter cutoff it's probably OK
>>> as long as you
>>> don't need to change it during a performance (then you *might* get a
>>> zipper effect
>>> and that can be digitally removed).
>>> YMMV
>>> paula at synth.net wrote:
>>>> Random question,
>>>> How many bits is "enough" for controlling the filter cut off on a 
>>>> VCF?
>>>> I would start with say 12, but would 16 be better? or 24?
>>>> At some point there's a cost trade off.
>>>> Thoughts?
>>>> _______________________________________________
>>>> Synth-diy mailing list
>>>> Synth-diy at synth-diy.org
>>>> http://synth-diy.org/mailman/listinfo/synth-diy
>>> -- ScottG
>>> ________________________________________________________________________
>>> -- Scott Gravenhorst
>>> -- http://scott.joviansynth.com/
>>> -- When the going gets tough, the tough use the command line.
>>> -- Matt 21:22
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at synth-diy.org
>>> http://synth-diy.org/mailman/listinfo/synth-diy
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at synth-diy.org
>> http://synth-diy.org/mailman/listinfo/synth-diy
>>