51 lines
1.5 KiB
Plaintext
51 lines
1.5 KiB
Plaintext
#The below 2 sections are commented, they control the default sound card to use
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#This set up is for a Pi with an I2S microphone attached using the guide
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#from adafruit at
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# https://learn.adafruit.com/adafruit-i2s-mems-microphone-breakout
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#Uncomment and the I2S will be your default card (assuming same setup)
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#but you won't get audio playback because both recording and playback will be
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#defaulted
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#TODO - Figure out how to set default for recording separately
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#To adjust use aplay -l to work out the devices you have and their card number
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#For recording devices use arecord -l
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#pcm.!default {
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# type hw
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# card 1
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#}
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#ctl.!default {
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# type hw
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# card 1
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#}
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#This section makes a reference to your I2S hardware, adjust the card name
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# to what is shown in arecord -l after card x: before the name in []
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#You may have to adjust channel count also but stick with default first
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pcm.dmic_hw {
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type hw
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card sndrpii2scard
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channels 1
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format S32_LE
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}
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#This is the software volume control, it links to the hardware above and after
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# saving the .asoundrc file you can type alsamixer, press F6 to select
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# your I2S mic then F4 to set the recording volume and arrow up and down
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# to adjust the volume
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# After adjusting the volume - go for 50 percent at first, you can do
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# something like
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# arecord -D dmic_sv -c2 -r 48000 -f S32_LE -t wav -V mono -v myfile.wav
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pcm.dmic_sv {
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type softvol
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slave.pcm dmic_hw
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control {
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name "Boost Capture Volume"
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card sndrpii2scard
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}
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min_dB -3.0
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max_dB 30.0
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}
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