On Wed, Feb 15, 2017 at 11:02 PM, Pablo Riera <pablo.ri...@gmail.com> wrote:
> I am collecting information on how to accomplish DSP projects (mainly > synths, only output) with low cost or makers boards. > > -Arduino Uno 16 bit PWM, 25 usd > -Arduino Due 12 bit DAC, 50 usd > -Beaglebone + Bela 16 bit DAC, 170 usd > -Raspberry Pi + Behringher Uca22216 bit DAC, 70 usd > -16 bit DAC module, 5 usd (and some fast board, Due? ) > > I am not sure about maximum sampling rate for each case, but I think they > all reach 44.1 kHz, (maybe not for the arduino UNO). It will be nice to run > code at higher bit depths and rates but DAC outputs at CD quality. > > Does anyone has experience with some of these combinations or others and > could share comments on technical issues, ease of use, latency, audio > quality (noise, max sampling rate), etc. > > Thanks in advance. Great list by the way. > Pablo I'm one of the developers of Bela and can supply a bit more info. It has a 16-bit stereo audio ADC and DAC, plus 8x each of 16-bit DC-coupled analog I/O. Low latency was one of our core design principles for Bela. We use a Xenomai Linux environment to get audio buffer sizes as small as 2 samples, producing round-trip audio latency as low as 1ms (or down to 100us using the non-audio analog I/Os). The design also samples the analog and digital I/Os at audio rates, synchronously with the audio clock. You can a paper about how the environment works here: http://www.eecs.qmul.ac.uk/~andrewm/mcpherson_aes2015.pdf (More info at http://bela.io and https://github.com/BelaPlatform/Bela/wiki.) The CPU on the BeagleBone Black isn't as powerful as the Pi3; on the other hand, the hard real-time audio environment means that you can run with much smaller latencies without glitches, as long as your code is fast enough to run in real time. At the moment we support C/C++ and Pd with experimental support for a few other languages and environments (SuperCollider, FAUST, Pyo). Andrew -- Andrew McPherson Reader in Digital Media Centre for Digital Music School of Electronic Engineering and Computer Science Queen Mary, University of London Mile End Road London E1 4NS Phone: +44 (0)20 7882 5774 Email: a.mcpher...@qmul.ac.uk Web: http://www.eecs.qmul.ac.uk/~andrewm _______________________________________________ dupswapdrop: music-dsp mailing list music-dsp@music.columbia.edu https://lists.columbia.edu/mailman/listinfo/music-dsp
