Configure ALSA - respeaker/avs GitHub Wiki

ALSA configuration file can be placed at /etc/asound.conf or ~/.asoundrc. We can enable dmix with the following configuration.

1. ~./.asoundrc for respeaker mic array on raspbian

pcm.!default {
    type asym
    playback.pcm "dmixed"
    capture.pcm "plughw:1"
}

pcm.dmixed {
    type dmix
    slave.pcm "hw:1"
    ipc_key 55555
}

2. /etc/asound.conf for respeaker v2

pcm.!default {
    type asym
    playback.pcm "dmixed"
    capture.pcm "plughw:0,0"
}

pcm.dmixed {
    type dmix
    slave.pcm "hw:0,2"
    ipc_key 55555
}