[sdiy] Sound synthesis with microcontrollers

[Tim Ressel]

Yo,

--- jbv <jbv.silences at club-internet.fr> wrote:
> 
> 
> Paul Maddox :
> 
> > another option might be to look at the smaller
> FPGAs,
> > AS you can do things in parallel and create your
> own multipliers you could
> > probably get a better 'width' for your multiply
> and probably faster too.
> 
> Yes, I know it's an option, and it's been discussed
> here
> already...
> Actually, I think I've put together (at least on
> paper)
> a rather simple architecture : a fast uC (Scenix 75
> MHz),
> a multiplier (FPGA or Logic Devices) and some SRAM.
> It should be able to run several algos, most of them
> simple loops at 48 KHz.

You guys should have seen the circuit for the old
Alesis Midiverb. It implimented add/subtract,
accumulator, dynamic RAM, and a shift-and-add/subtract
style multiplier, all out of TTL components. It was a
discreet DSP!! Keith Barr may have been the hardest
person to work for, but he is a genius.

My concept for a digital synth included an Analog
Devices Sharc DSP. These were cool in that they are
easilly expandable into multiple processor systems.
The didtal 'modules' were to mimic their analog
cousins i.e. a biquad filter would be done with two
ditigal integrators etc. It would be patchable by
setting up a GUI on a PC and downloading the patch to
the synth.

So far I'm still in the Dream Phase of the design :-(

--Tim

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