[sdiy] Filter cut off DAC

[Scott Gravenhorst]

paula at synth.net wrote:
>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

Unless you need the values between each integer change, smoothness can be
achieved with a simple single pole IIR low pass filter. This is how I
eliminate zippers in digital synths (and I realize you want to control an
analog device with digital bits). 

ARGH!  I meant not an IIR filter, rather a simple RC low pass filter.



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