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July 19, 2013

USB Sound card setup with raspberry pi

Two options of attaching a microphone into Raspberry Pi. One is to have USB mic, another to have an external USB sound card. Regardless the choice, the following instruction will work in setting up some basic microphone setup, before doing something cool like recording music, or exeperimenting with voice recognition modules.

  1. To enable USB audio output, load the sound driver:
sudo modprobe snd_bcm2835

2. To prevent the internal sound card to appear at the top comment out line, and change index from -2 to 1:

sudo nano /etc/modprobe.d/alsa-base.conf

options snd-usb-audio index=1

3. Enable USB audio output by default

sudo nano /etc/asound.conf
pcm.!default {
  type plug
  slave {
    pcm "hw:1,0"
  }
}
ctl.!default {
  type hw
  card 1
}

4. Reboot now:

sudo reboot

5. To record:

arecord -D plughw:0,0 -f cd test.wav

6. To playback:

aplay test.wav
7. You may want to adjust some volumes:
alsamixer
8. To save your settings:
sudo alsactl store

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