There's good info on http://puredata.info/docs/raspberry-pi covering this, if you haven't seen it.
There seem to be a limited number of interfaces that work. And some people have to slow down the USB port to get clean audio (myself included, using the iMic ( http://www.amazon.com/Griffin-Technology-iMic-Audio-Device/dp/B000BVV2IC). And I have to use a wireless keyboard/mouse if I'm not connecting via ssh ( http://www.amazon.com/gp/product/B004KSQANO/). It's not ideal, and a little annoying that the accessories are more than the cost of the Raspberry Pi. But it works. The USB port is slowed down by adding "dwc_otg.speed=1" to /boot/cmdline.txt -Theron ^ On Tue, Oct 29, 2013 at 12:03 AM, s p <[email protected]> wrote: > Same here ... I tried with 2 different usb interfaces, and I got no luck. > In both cases I got "some" sound input, but there is a lot of popping > sounds. > > > 2013/10/28 Chris Jack <[email protected]> > >> Hey folks, >> >> Apologies as this post is not strictly about Pd, though Pd will be a >> crucial part of my final setup so whatever solution I find ought to work >> with Pd. Also, there is a chance the issue might lie with Pd. I just don't >> know. >> >> I'm looking for a usb bus-powered audio interface for the Rpi that can >> take a stereo input and provide stereo output *at the same time.* >> * * >> I have tried a couple different images and a couple different audio >> interfaces, to no avail. Perhaps there's something can be done with one of >> these setups to get it working? >> >> First, the Pd-LA custom Raspian (v1) image and Pd 43.2: >> >> ..with Behringer UCA202 (at 44100khz): >> >> Alsamixer picks the device up but the input section shows nothing. >> >> Pd (gui) audio preferences allows selection of the interface for both >> input and output. Output only is lovely and clean but as soon as the device >> is selected for audio input the audio quality drops horrendously (vaguely >> recognisable from the original signal).. >> ..although what gives me hope is I CAN software monitor the input >> (poorly) in 'Test Audio and MIDI' with this arrangement. >> >> ..with Behringer UCA202 (at 48000khz): >> >> Output only in Pd is poor (beating and popping sound - possibly sounds >> like a samp rate conversion issue). >> When device is selected as Pd input software monitoring is possible and >> oddly, though the result is still poor, there is effectively no drop in >> quality from having the device selected only for output and the monitored >> signal sounds drastically better than at 44100khz. >> >> >> ..with Turtle Beach Amigo II* (at 44100): >> >> Alsamixer shows both input and output and allows to change gain of both. >> If plugged in from boot and only the output is selected in Pd it works >> but with a lot of jitter. Selecting the device for input too causes a >> further drop in audio quality although again I can software monitor the >> input in 'Test Audio and MIDI' >> If plugged in after boot the OS crashes. >> >> >> The Satellite CCRMA (operating via ssh) and Pd-extended: >> >> ..with Behringer UCA202 (at 44100 and 48000): >> >> Alsamixer picks the device up but again the input section shows nothing. >> >> If I have the device plugged in from boot then I get the same behaviour >> with it as I do in Pd vanilla on the Pd-LA Raspian image, ie. software >> input monitoring but at an extremely poor quality. >> >> If I don't plug the device in from boot I see it in Pd audio prefs but >> get this: >> >> ALSA input error (snd_pcm_open): No such file or directory >> >> ALSA output error (snd_pcm_open): No such file or directory >> >> from the Pd terminal and this >> >> ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card >> ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card >> oops: ALSA cards not reported in order? >> >> from the ssh terminal. >> >> >> ..with Turtle Beach Amigo II* (at 44100khz): >> >> Alsamixer shows both input and output and allows to change gain of both. >> >> If plugged in from boot and then only output selected in Pd I get clean >> audio out. If I try to select the Turtle Beach as audio inout in Pd then Pd >> stalls indefinitely when I try to 'Test Audio and MIDI' or make anything in >> a patch. >> >> Same direct input monitoring by default. >> >> Also get >> >> ALSA input error (snd_pcm_open): Device or resource busy >> >> ALSA output error (snd_pcm_open): Device or resource busy >> >> from the Pd terminal if I don't have it plugged in from boot, though no >> message in ssh terminal. >> >> *It also appears that by default the Turtle Beach does direct input >> monitoring of some sorts, the output stage sending out a clean copy of >> whatever signal is going into the input stage whenever the device is >> plugged into a usb port. With the Pd-LA image this occurred simultaneously >> while input monitoring in Pd. I guess this is part of the design of the >> Turtle Beach, though their documentation is devoid of any useful info >> regards this. If this is the case then this ain't the sound card for me, >> though clearly some might find this a very useful feature. >> >> Just to give a bit more info about what I'm attempting: I wish to run the >> stereo input from the Turtle Beach through Pd, play with the audio signal >> using data from an accelerometer (not nearly there yet) and then send the >> audio out through the Turtle Beach's stereo output. >> >> Apologies for the essay. Hopefully my findings are useful for others and >> hopefully I can get my rig working! Help muchly appreciated. I've probably >> left out some crucial bit of info so please shout me if I have! >> >> Cheers, >> Chris Jack. >> >> Chris Jack >> >> *art/research* >> http://itsmrjack.com/ >> >> *discus jockeying/sound art* >> http://soundcloud.com/itsmrjack/ >> >> _______________________________________________ >> [email protected] mailing list >> UNSUBSCRIBE and account-management -> >> http://lists.puredata.info/listinfo/pd-list >> >> > > > -- > *Sébastien Piquemal > * > * > ** *-----* @sebpiq* > -----* *http://github.com/sebpiq* > * > ----- http://funktion.fm > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > >
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