[sdiy] dsPIC with on-chip audio DACs

[Antti Huovilainen]

On Sat, 5 Jul 2008, Eric Brombaugh wrote:

> My current project is running the system at near maximum CPU and DAC 
> rates (40MIPS, 100kHz) and even a fairly simple NCO takes about 15-20% 
> of the processor bandwidth.

Out of curiosity, what exactly are you doing in it?
The cpu horsepower should allow (assuming the core instruction set is up 
to the task) one or two voice wavetable synth with antialiased oscillators 
and analog modelled filter (at 48 kHz).

A couple of years ago I did work (only algorithm and instrument design, 
not actual code) on a similarly specced DSP that allowed roughly 10-15 
simultaneous voices with antialiased oscillators and MS-20-ish filter.

If the ADCs can be used for audio (at say 2x oversampling), a fairly 
nifty multifx processor should be possible too (phaser, flanger, chorus, 
shortish delay etc).

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
   -- Lt. Cmdr. Ivanova