Sound Card

Mic

Record audio

   # View all available MIC devices
   $ arecord -l

   # Select the sound card and record audio
   $ arecord -f cd -Dhw:0,0 -d 10 -c 8 /tmp/test.wav

PC uses ADB tool to copy the recorded audio to the computer for
playback verification

   adb pull /tmp/test.wav ./