Tag: raspberry pi

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Pd synth examples

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A collection of Pd synth patches that might run on Raspberry Pi.

 

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bluetooth with Raspberry-Pi

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Raspberry Pi with Pd: audio test

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In an audio pass-through test using Pd, with a USB sound card (Griffin iMic), the maximum stereo sample rate before ‘breakup’ is 32000.In mono, it sounds “ok” at 44100. Latency seems low enough to use for music but I’m too sleepy to figure out the numbers.

I don’t know enough about Linux audio to say if the performance deficit is due to ALSA drivers, the sound card, background processes, pd, the CPU, or what?Anyway I ‘m guessing R-Pi will spawn interesting synths and lo-fi FX processors. They’re cheap enough you could use them in parallel.

Prediction: They’ll double the speed, and sell a million more by the end of the year. We’ll see a range of ‘Pi’ clones which run the same Linux distributions, but offer various speeds and IO options. It feels like the democratization of manufacturing has taken another huge leap.

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pd-extended on Raspberry Pi

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Using installation instructions from Pd site:

http://puredata.info/downloads/pd-extended-0-43-3-on-raspberry-pi-raspbian-wheezy-armhf

Installation worked fine. I tried running the GUI under xterm and it was a disaster. Then, using this post, I was able to get a test patch (sine wave with LFO) running in terminal mode:

http://log.liminastudio.com/programming/running-puredata-on-the-raspberry-pi

Note: I changed the actual command to this due to the fact I’m running pd-extended and a USB sound card:

pd-extended -nogui -noadc testPatch.pd

This post from same source has instructions for installing pd-extended (disaster) but a very nice version of the test patch called testPatchExtended.pd

http://log.liminastudio.com/writing/tutorials/how-to-build-pd-extended-on-the-raspberry-pi

(another update) running Midi:

To run midi you need to specify the device on the command line. First I plugged in the m-audio key station 49 and rebooted RPi

To get a list of devices use:

pd-extended -nogui -listdev

Then to run a patch with midi

pd-extended -nogui -noadc -midiindev 1 testMidi.pd

Here is a page with more information on command line options

http://crca.ucsd.edu/~msp/Pd_documentation/x3.htm#s4

(another update) Testing with Griffin iMic. Bad news when doing an ADC->DAC passthrough, sample rates above 32000 don’t work in stereo. However 44100 and 48000 sound fine in mono.

At the higher rates in stereo, the audio breaks up. Oh well. Need to try the Behringer audio box, but I’m assuming there will be no difference. Only possibility would be to somehow devote more system resources to audio.

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raspberry pi – external sound card sucess

Installed a Griffin iMic USB sound card on Raspberry Pi today.

Here’s how:

  • plug in imic
  • Edit alsa  config file so that imic is default sound cart
  • test

Details

For editing alsa, follow instructions at beginning of this post for editing /etc/modprobe.d/alsa-base.conf 

But you can stop following the instructions after the first reboot.

http://www.jackenhack.com/raspberry-pi-usb-audio-quality-problems/

For testing, use this command:

sudo aplay /usr/share/sounds/alsa/Front_Center.wav

 

 

 

 

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Raspberry Pi sound cards

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http://elinux.org/RPi_VerifiedPeripherals#USB_Sound_Cards

A post about installing USB sound cards

http://www.raspberrypi.org/phpBB3/viewtopic.php?t=20866

And another – with better detail

http://www.jackenhack.com/raspberry-pi-usb-audio-quality-problems/

http://raspberrypi.stackexchange.com/questions/3888/how-to-install-usb-sounds-adapter

Griffin imic with PD

http://iamthemightyjungulator.blogspot.com/2012/12/raspberry-pi-usb-sound-into-pure-data.html

 

 

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Raspberry Pi running Pure Data

example video

http://vimeo.com/50498017

PD extended…

http://log.liminastudio.com/writing/tutorials/how-to-build-pd-extended-on-the-raspberry-pi

and this update

http://puredata.hurleur.com/sujet-8036-build-extended-raspberry-raspbian-wheezy-armf

Running PD on a headless RP

http://guitarextended.wordpress.com/2012/08/28/running-pd-on-a-headless-raspberry-pi/

Here’s a comprehensive install script for PD-extendended from 9/2012

http://iamthemightyjungulator.blogspot.com/2012/09/running-pd-extended-on-raspberry-pi.html

and another

http://puredata.info/downloads/pd-extended-0-43-3-on-raspberry-pi-raspbian-wheezy-armhf