[sdiy] Filter cut off DAC

[Veronica Merryfield]

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.

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

> 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?
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>> -- ScottG
>> ________________________________________________________________________
>> -- Scott Gravenhorst
>> -- http://scott.joviansynth.com/
>> -- When the going gets tough, the tough use the command line.
>> -- Matt 21:22
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