[PD] [OT] Raspberry Pi Wolfson Audio Card

[Winfried Ritsch]

Am Donnerstag, 13. März 2014, 16:01:20 schrieb Rafael Vega:
> Anyone wants to share their experience with the BeagleBoneBlack?
>
Yes.

Since autumn, i am trying to set up an kit hardware+software with BBB for 
computer-musicians as stomp box, works quite well, after successfully 
installed it in a long term sound installation (headless):

some points short:

system:
 + BBB moved to Debian since this year (good)
 + USB Audio works fine und better now with kernel >= 3.12
 + Network performance works better with kernel >= 3.12
 - IO support doenst use device-tree overlays anymore on kernel > 3.8
 + an iio-backend for Jack2 to use the internal AD's 
   in jack for processing sensor data in PD ;-)))  but tricky

sound:

 + down to 10ms with PD and cheap 8 channel out, 2 in 
   USB soundcard Logilink 7.1    (EUR 19.90) 
 +  5ms with Logilink stereo USB (EUR 3,90) 
 + success with audio-cape (stereo, but too expensive for the quality)
 - sound quality is normally as bad as on most notebooks, tablets and so on 
 + but with a trick: filtered 5V supply for the USB-card not the USB power
   it seems to get reasonable quality 
   (They have all the same chips like expensive USB cards: C-Media)

I just made a blog on this, but it is not public only for intern usage, if 
anyone is interested in the IEM-embedded-Sound-Kit (doing some audio over 
ethernet stuff) i can make it open (after some polishing, especially the 
english) and release the PD-lib (GPIO,AD,I2C,... interfacing) for these 
devices.

This dev's should also work for Cubie-boards, Wand-boards, UDOO and other arm 
based boards.

mfg 
 winfried

PS: Maybe we can start an own thread on this.


 
> On Thu, Mar 13, 2014 at 3:11 PM, Brian Fay <ovaltinevortex at gmail.com> wrote:
> > While I'm sure that Dan is right that the UDOO is the better choice for
> > USB audio, I do have to say that I've had decent success using my
> > Raspberry
> > Pi as a guitar effects processor, with the Behringer UCG102 interface.
> > 
> > There's definitely a lot of quirkiness to getting it running... for
> > example ALSA gets in an infinite restart loop when attempting low latency
> > on pd-extended, but vanilla starts up fine under the same settings. And
> > then there's the fact that an issue in the kernel screws up USB audio on
> > major distros like Raspbian.
> > 
> > I'm using the Satellite CCRMA distro right now with much better success.
> > So far I've got various delays, a looper, and a waveshaper distortion
> > running within the same patch, at <20ms latency with very few noticeable
> > dropouts. Parameters are adjustable with a QuNeo MIDI controller and with
> > a
> > button attached to the GPIO pins.
> > 
> > The Pi is a bit more affordable than the UDOO boards, but then again I had
> > to buy a powered USB hub. Ultimately for one audio input the Raspberry Pi
> > could probably serve most purposes, while the UDOO is more likely to scale
> > to bigger installations.
> > 
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-- 
---
Ritsch, Winfried, Ao.Univ.Prof. Dipl.-Ing.
   Institut 17 Elektronische Musik und Akustik
   8010 Graz, Inffeldgasse 10/III
E-Mail 	ritsch at iem.at
Homepage 	http://iem.at/ritsch
Mobil 	++436642439369
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