[sdiy] Raspberry Pi 2 Synthesizer Project

[Richie Burnett]

Sounds good. What did you write the code in? Assembly, C, python? 

-Richie, 

Sent from my Xperia SP on O2

---- Scott Gravenhorst wrote ----

>If you're on music-dsp, you already know about this.
>
>I purchased a Raspberry Pi 2 a bit before Christmas and have been 
>working on a synthesizer.  Quad core ARMv7 900 MHz CPU.  I also have the 
>Cirrus Logic/Element14 sound card (24 bit stereo up to 192 kHz. 
>Line-in, line-out, S/PDIF and other features).
>
>So far, using ALSA, I've made an organ type polysynth (32 voices).  Each 
>voice is computed arithmetically as y=sin(a)+sin(2a).  I've isolated 2 
>of the 4 cores so that the synth runs in one core and the MIDI 
>controller runs in another though the MIDI controller seems to run fine 
>along side other linux stuff in a shared core.  It's currently working 
>while LXDE deskstop runs.  The synth core uses about 55% CPU at idle and 
>around 80% when using most of the voices.  No crashes or glitches.  I 
>will need to measure latency, but the latency contributed by ALSA 
>buffering is down around 1/6 millisecond (period is 8 frames and the 
>sample rate is 44100 Hz).
>
>I'm quite impressed by the power of this little thing, especially for a 
>$35 computer board.
>
>-- ScottG
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