[sdiy] FPGA based synthesizer progress....

[Jim Patchell]

I will have to take a picture of it...it is mostly off the shelf stuff...

For the FPGA, I am using a Spartan3 Starter Kit with an XC3S1000 on it. 
  This board is available from Digilent.

For the micro controller, I am using an Atmel ATmega2561 mounted in an 
STK500/501 board set.

I made a custom board to interface between the Spartan board and the STK500.

I still have to make the audio interface.  I purchased some SIOC to Dip 
conveter boards from Sparkfun and have some Crystal Semiconductor delta 
sigma DACs to mount on them.

I am hoping to show this off at the Pacific Northwest DIY meet this 
october in Seattle...(well, actually Renton).

-Jim

Eric Brombaugh wrote:
> Jim Patchell wrote:
>> It is slow progress, but it is being made.  I just got the envelope 
>> generator core working.  This sucker was a lot more difficult to do 
>> than I thought.  It implements 512 ADSR envelope generators that can 
>> run at 96K samples per second.  I already have 512 NCOs running...so, 
>> now all I need to do is get the VCA/Mixer running and connect that to 
>> my I2S core...and I will have a simple digital synthesizer with 512 
>> voices...
>>
>> As soon as I get this done, I will be posting it...on my website, and 
>> maybe Opencores.org.
> 
> Sounds neat. What hardware are you targeting right now - is it something 
> custom you've built, or is it one of the readily-available development 
> systems?
> 
> Also - how do you plan to control 512 voices?
> 
> Eric
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