How to record and filter noise from mic in Linux

recnoisered.sh

# Useful links
# https://stackoverflow.com/questions/42904441/pipe-sox-play-command-to-stdout
# http://www.zoharbabin.com/how-to-do-noise-reduction-using-ffmpeg-and-sox/

# Record some noise

sox -t alsa default -b 16 -r 44100 -e signed -t wav - -t wav /tmp/noise.wav

# or alternative with arecord

arecord -f dat | sox -t wav -b 16 -r 44100 -e signed - -t wav /tmp/noise.wav

# Profile noise

sox /tmp/noise.wav -n noiseprof /tmp/noise.prof

# Play with filtered noise

arecord -f dat | sox -t wav -b 16 -r 44100 -e signed - -t wav - noisered /tmp/noise.prof 0.21 | play -

Thanks! If someone else finds this: -f dat runs at 48kHz, so you need to change the sox command to -f 48000!