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

[Scott Gravenhorst]

Jim Patchell <patchell at cox.net> wrote:
>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.

Will this method avoid the dreaded 1/6 sample rate restriction from which the SVF suffers?


>-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
>> -- PolyDaWG/8 - FPGA Based 8 Voice Polyphonic 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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>> 
>
>-- 
>----------------------------------------------
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-- ScottG

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

-- Scott Gravenhorst
-- GateManPoly - FPGA Based Polyphonic MIDI LA/FM Synthesizer
-- GateMan-III - FPGA Based Monophonic MIDI LA/FM Synthesizer
-- PolyDaWG/8 - FPGA Based 8 Voice Polyphonic 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.