[PD] Pd on a headless Raspberry Pi
james at 4thharmonic.com
Thu Aug 30 12:36:43 CEST 2012
I've had issues with the audio out as well as USB audio but changing the
sample rate to 48000 for the USB audio interface works great. I haven't
tried it with pd yet as it was for a different project using Darkice to
broadcast the sound of a cafe from 6am until 12pm GMT
(http://radeq.vacau.com), but as soon as I get the pi back I'll be
looking into pd again...
Quoth Pierre Massat, on 29/08/2012 20:53:
> This is all very interesting!
> To get back to my initial problem, i managed to solve it by launching
> Pd with a longer audio buffer (-audiobuf 100). For some reason Pd came
> with a default buffer of 25ms.
> Now, I can't tell you whether it sounds as "good" or worse than the
> same audio data played in aplay. I'll need to test this further.
> 2012/8/29 Tedb0t <lists at liminastudio.com <mailto:lists at liminastudio.com>>
> Ah, wow, that's crazy. Has anyone yet tried out any USB audio
> interfaces on the RPi yet? I have one handy that I can try but
> not until I get these client projects out of the way ;)
> I'm extremely curious if using a supported external audio
> interface solves all the sound problems or if there are also still
> alsa issues. I'm also now wondering who will be the first to come
> out with an RPi audio "shield" ;)
> This renews my interest in modifying the RPi design to make a
> Pd-friendly board that's intended to be headless with a built-in
> quality DAC. But without RPi's supply chain hookups, it'd be
> quite hard to keep the price down to the RPi's level!
> On Aug 29, 2012, at 1:08 PM, Andy Farnell wrote:
> > Yes I heard that too. It's single bit PWM modulated output.
> > Basically there's no DAC, so audio output is a fun hack,
> > and likely as good as it's worth trying to make it for
> > simple applications.
> > If you want good quality audio I/O there are things like
> > Turtle Beach Amigo for about 15 quid
> > You can take it out the board from its plastic housing. Its about
> > as small as an SD card.
> > a.
> > On Wed, Aug 29, 2012 at 04:40:44PM +0200, Pierre Massat wrote:
> >> There's a guy called "dom" on the RPi forum who seems to be
> involved in
> >> audio development. I've seen his interventions in a couple of
> audio related
> >> threads, and i got the information about the analog output
> being simple
> >> filtered PWM off one of his posts.
> >> Might be interesting to get in touch with him.
> >> Pierre.
> >> 2012/8/29 Tedb0t <lists at liminastudio.com
> <mailto:lists at liminastudio.com>>
> >>> This is what I'm curious about; who is doing this alsa
> development, where,
> >>> and can we pitch in? We are all interested in getting the
> sound working
> >>> better on the Pi...
> >>> That said, it seems like the jury is out on if it's an alsa
> problem or a
> >>> Pd problem. I seem to have experienced both.
> >>> ---Tedb0t
> >>> On Aug 29, 2012, at 6:46 AM, geoffroy wrote:
> >>> With the PI the alsa is in alpha development on the arm
> platform and
> >>> therefor won't be at it's best for a little while. The
> floating point
> >>> integration in the latest system made the audio a lot better,
> as on the
> >>> first gen OS of the PI the audio was just impossible.
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