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 <[email protected]> > 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 <[email protected]> > >> > >>> 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. > >>> > >>> > >>> > >>> _______________________________________________ > >>> [email protected] mailing list > >>> UNSUBSCRIBE and account-management -> > >>> http://lists.puredata.info/listinfo/pd-list > >>> > >>> > > > >> _______________________________________________ > >> [email protected] mailing list > >> UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > > > > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list >
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