[sdiy] FPGA based synthesizer progress report....

[harrybissell at wowway.com]

Make the oscillators sine wave and the phase won't be a problem :^P

(oops, I mean a ~feature~ :^)

lol

H^) harry



On Tue, 14 Oct 2008 11:35:27 -0700, Jim Patchell wrote
> Last night I got the Midi interface hardware working.  Not an easy 
> thing to do.  I was getting a bunch of gibberish out of the Midi 
> port...and I was really scratching my head...
> 
> Turns out, my Oberhiem XK was going NUTs!  It was spitting out all 
> kinds of wierd stuff.  A power cycle on the XK solved that problem 
> and it turned out the Midi uart worked as advertised.
> 
> Tonight...I need to get the Midi Parser working...I wrote one a long 
> time ago that was compiled with Image Craft ICC, and I need to make 
> a few minor changes so it will work with WinAVR gcc and also with 
> the real time operating system I wrote...
> 
> Then, I need to write a scheduler to route the notes played to the 
> proper set of oscillators and complete a patch editor, and it should 
> be pretty much done...(well, this phase...then I need to add a 
> digital filter).
> 
> This project has been fun.
> 
> One interesting thing I have noted.
> 
> The phase relationship of two sawtooth waveforms (even when they are 
> exactly the same frequency) makes a huge difference in the timbre 
> you get.  I am going to have to add (later) a feature to make sure 
> that the phase of the oscillators is known at the start of a note so 
> that the sound is predictable.  This also means by adding phase 
> modulation, I should be able to get some interesting (but subtle) effects.
> -- 
> ----------------------------------------------
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Harry Bissell & Nora Abdullah 4eva