[sdiy] Digital filtering question

[Wooster Audio]

  I'm using fixed point, I guess it is technically Q17:

   http://en.wikipedia.org/wiki/Q_%28number_format%29

There is some great information on FPGA synths here: 
http://www.fpga.synth.net/

Nathan

On 8/24/2010 9:03 AM, Thomas Strathmann wrote:
> On 8/24/10 15:43 , Wooster Audio wrote:
>> I've got an 18-bit 4-pole IIR filter running on my FPGA synth.  It
>> sounds okay, but hopefully has some room for improvement. I have a
>> feeling the extra bits come in handy for resonance and distortion.
>
> That's interesting. How did you implement the arithmetic operations? 
> Fixed or floating point? And now for the FPGA ignorant question: What 
> kind of implementation for bounded precision real arithmetic is 
> popular (i.e. efficient in terms of resource consumption vs. 
> performance) with FPGAs?
>
> I've long wanted to get into FPGAs for synthesis and other stuff, but 
> have been put off by the investment in hardware and time as well as by 
> a disastrous second hand experience with VHDL on Virtex FPGAs.
>
>     Thomas
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