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

[Jim Patchell]

Nope...exactly the same problem.  :-(....although, at 192KHz sample 
rate, the max cuttoff would be ~32KHz...and around 8KHz is really all 
you need...

Scott Gravenhorst wrote:
> 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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>>>
>> -- 
>> ----------------------------------------------
>> Visit http://www.noniandjim.com
>> SDIY: http://www.noniandjim.com/Jim/index.html
>> ----------------------------------------------
>>
> 
> -- 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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> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 
> 

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