DIY Digital Synth

[Curtin, Steven D (Steven)]

Add a DRAM controller, then you could just use the cheap DRAM they use for
PCs for your wavetable storage.  That's what they do for commercial digital
samplers.  You would have to time-slice memory accesses, but the decrease in
FPGA cost and VHDL compile time might be worth it.

Steve C

-----------------------------------------------------------------
Steven Curtin  
Lucent Technologies Microelectronics
ph: (732)949-4404   fax: (732)949-6711
http://curtin.emf.org
sdcurtin at lucent.com
-----------------------------------------------------------------


> ----------
> From: 	Jim Patchell[SMTP:patchell at silcom.com]
> Sent: 	Tuesday, September 19, 2000 3:38 PM
> To: 	jbv
> Cc: 	synth-diy at node12b53.a2000.nl
> Subject: 	Re: Re : DIY Digital Synth
> 
> 
> 
> jbv wrote:
> 
> > Hey boys & girls, here's more food for the brain !
> >
> > Here is a block diagram of the digital synth I mentioned
> > in my previous post :
> > http://perso.wanadoo.fr/jbv.silences/DIY/Architecture.jpg
> >
> > As explained before, it is heavily inspired from the 4C
> > by Di Giugno. This configuration was called 4U
> > (actually an extension of the 4C) and the 4X featured
> > 8 similar boards for a total of 1700 TTL chips...
> > As you can see, it's pretty similar to a DSP...
> >
> 
>     A lot more general purpose that what I had in mind.  It also could
> make
> a nice machine, I would imagine for doing a virtual analog......hmmm there
> is another thought.
> 
>     Except for the big block of RAM and the Wave Table, I think everything
> thing you have there would fit real nice into an FPGA, in fact, you might
> be
> able get two in a single FPGA.
> 
>     By the way, and it could be my connection (we seem to be having a bit
> of
> trouble today), I was only able to get about 1/2 of the above jpg.  I got
> the jist I think.  I will try again latter tonight.
> 
> >
> > jbv
> 
>     -Jim
> 
>