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#!/bin/bash
#
# Set up rnnoise-based microphone noise filtering
#
# - Install the ladspa noise-suppression plugin form here: https://github.com/werman/noise-suppression-for-voice
# - Then use this script to play around with the settings until you have something that works well.
# + Find potential sources with: pacmd list-sources | awk -F'[<>]' '/name: /{print $2}'
# - Finally, put the "load-module *" lines into your /etc/pulse/default.pa for persistence.
source="$1"
control="${2:-40}"
channels="${3:-2}"
pacmd unload-module module-null-sink
pacmd load-module module-null-sink sink_name=mic_denoised_out rate=48000 format=s16le
pacmd load-module module-ladspa-sink sink_name=mic_raw_in sink_master=mic_denoised_out label=noise_suppressor_mono plugin=/usr/lib/ladspa/librnnoise_ladspa.so control="$control",20,0,0,0
pacmd load-module module-loopback source="$source" sink=mic_raw_in channels="$channels" source_dont_move=true sink_dont_move=true latency_msec=1
# remap to regular source for chromium
pacmd load-module module-remap-source source_name=denoised master=mic_denoised_out.monitor channels="$channels"
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