[PD] Pd on a headless Raspberry Pi

[Pierre Massat]

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.

Cheers,

Pierre.

2012/8/29 Tedb0t <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!
>
> —t3db0t
>
> 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
> >
> http://www.turtlebeach.com/products/sound-cards/audio-advantage-amigo-ii.aspx
> >
> > 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>
> >>
> >>> 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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