[sdiy] FPGA synth I have been toying with for a while

[Jim Patchell]

Well...sort of...I guess... :-)

It is going to be a model of a standard 4 pole low pass fileter...with 
resonance.  I was just going to do a state variable filter...but, 
thought I would try the four pole instead.

in ->DIFF-----MULT---->SUM----->Z-1------ out
       ^        ^       ^              |
       |        |       |              |
       |      freq      |              |
       |                |              |
       +----------------+--------------+

	That is a rough idea of each pole section...four of those 
cascaded...with feedback around the whole mess.

-Jim

Scott Gravenhorst wrote:
> Jim Patchell <patchell at cox.net> wrote:
>> Hopefully, I can keep the momentum up on this project.  My hope...to 
>> show it off at the last PNW Synth DIY meet in October.
>>
>> http://www.noniandjim.com/Jim/dsm1/DigitalSynthesizerModule.html
> 
> Hey Jim,
> 
> Looks very interesting, have you decided on a specific filter topology yet?
> 
> -- ScottG
> 
> -----------------------------------------------------------------
> 
> -- Scott Gravenhorst
> -- GateManPoly - FPGA Based Polyphonic MIDI LA/FM Synthesizer
> -- GateMan-III - FPGA Based Monophonic MIDI LA/FM Synthesizer
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> -- 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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