[Fpga-synth] Digital Waveguide Monosynth

[Scott Gravenhorst]

"The making of synthesizers in FPGAs." wrote:
>Awesome, ScottG!  I'm gonna have a go at getting this running on my  
>Spartan3AN board tomorrow ..  I'll let you know how it goes .. maybe  
>I have some hardware hacking to do first though, for MIDI eh?

I'm not familiar with the 3AN, but the code I posted has a PicoBlaze embedded soft
MIDI controller in it.  All I added to my S-3Esk was a physical MIDI connection
through a 6N138 to a single pin on the FPGA.  There's a GIF file in the docs folder
with the schematic (corrected) that I used.  Of course, I also added a cap/resistor
interface from the DAC "A" output to my audio system.

>j.
>
>
>On Aug 5, 2007, at 1:47 AM, Scott Gravenhorst wrote:
>
>> http://www.fpga.synth.net/pmwiki/pmwiki.php? 
>> n=FPGASynth.DigitalWaveguide
>>
>> At the bottom of the article, I've added a zip file with the  
>> Verilog source
>> for a monosynth based on my digital waveguide experiments.  I found  
>> several
>> bugs in my code which I've fixed.  I also enhanced the project for  
>> use as a
>> monosynth.  The synth has switch selectable excitation of  
>> rectangular or
>> saw pulse.  The filter interface has been modified to "linearize" it's
>> response depending on whether you are doing strings or drums.  In  
>> either
>> case, the algorithm tends cause the entire keyboard range to generally
>> sound the same with respect to timbre.  Without this, it was  
>> possible to
>> set the filter such that at the low end, you got strings, but at  
>> the upper
>> end, you got drums.
>>
>> Hold a key down and trill another... (c:
>>
>> -- ScottG
>>
>> -------------------------------------------------------------
>>
>> -- Scott Gravenhorst
>> -- GateMan I - Xilinx Spartan-3E Based MIDI Synthesizer
>> -- FatMan: home1.gte.net/res0658s/fatman/
>> -- NonFatMan: home1.gte.net/res0658s/electronics/
>> -- When the going gets tough, the tough use the command line.
>>
>> _______________________________________________
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>
>;
>--
>Jay Vaughan
>
>
>
>
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-- ScottG

-------------------------------------------------------------

-- Scott Gravenhorst
-- GateMan I - Xilinx Spartan-3E Based MIDI Synthesizer
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/
-- When the going gets tough, the tough use the command line.