[sdiy] STM32F4 synthesis examples

[julian schmidt]

Am 04.02.2013 12:03, schrieb rburnett at richieburnett.co.uk:
> Hi Julian,
>
> Sounds good!  You've achieved a lot there.  Is the ST micro running 
> the sequencer and taking care of all of the sound synthesis too?  Does 
> it have a UI and MIDI yet?
Yes - the ST is running the Sequencer and is generating all the sounds 
in realtime.
The ST is located on a small SMD mainbaord together with the audio codecs.
UI is handled by an AVR uC on the frontpanel. Current layout has 4 
knobs, 1 encoder, 1 2x16 lcd and 39 buttons to programm the sequencer 
(tr style) and edit sounds. MIDI is working (also USB, just need a 
VID/PID :-p ), even realtime recording to the sequencer.
>
> I'm curious if you used 16-bit or 32-bit calculations for the VA 
> algorithms?
since the ST is a 32bit uC most of the calculation is done in 32bit, too.
> I developed a TR-808 model to run on the dsPIC a few years back and 
> had to go to 32-bit calculations for a select few of the voice 
> algorithms.  It made a huge difference with problems like 
> limit-cycling and tuning innaccuracies due to the finite word-lengths.

> Good luck with the continued development of your project.  I look 
> forward to seeing and hearing about developments!
thanks a lot! :)
I'll let the list know when pics and more information is available.

cheers,
julian