PulseAudio: enable noise suppression on microphone

suppress.sh

#!/bin/bash

# This creates a noise-suppressed monitor of the Yeti Nano

# see: https://unix.stackexchange.com/a/579680/44856
# see: https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Modules/#index45h3

##
# To view available sources:
#   pactl list sources short
#
# example output:
#   0	alsa_output.usb-Blue_Microphones_Yeti_Nano_2034SG007ST8_888-000154040606-00.analog-stereo.monitor	module-alsa-card.c	s24le 2ch 44100Hz	RUNNING
#   1	alsa_input.usb-Blue_Microphones_Yeti_Nano_2034SG007ST8_888-000154040606-00.analog-stereo	module-alsa-card.c	s24le 2ch 44100Hz	RUNNING
#   2	alsa_output.pci-0000_0b_00.1.hdmi-stereo-extra1.monitor	module-alsa-card.c	s16le 2ch 44100Hz	RUNNING
#   3	alsa_output.pci-0000_0d_00.4.analog-stereo.monitor	module-alsa-card.c	s16le 2ch 44100Hz	RUNNING
#
#
# To view available sinks:
#   pactl list sinks short
#
# example output:
#   0	alsa_output.usb-Blue_Microphones_Yeti_Nano_2034SG007ST8_888-000154040606-00.analog-stereo	module-alsa-card.c	s24le 2ch 44100Hz	IDLE
#   1	alsa_output.pci-0000_0b_00.1.hdmi-stereo-extra1	module-alsa-card.c	s16le 2ch 44100Hz	IDLE
#   2	alsa_output.pci-0000_0d_00.4.analog-stereo	module-alsa-card.c	s16le 2ch 44100Hz	IDLE
##

# specify the audio source and sink
source_master="alsa_input.usb-Blue_Microphones_Yeti_Nano_2034SG007ST8_888-000154040606-00.analog-stereo"
sink_master="alsa_output.pci-0000_0d_00.4.analog-stereo"

# load the `module-echo-cancel` PulseAudio module
pactl load-module module-echo-cancel \
   sink_name="echo_cancel" \
   source_master="$source_master" \
   sink_master="$sink_master" \
   aec_method="webrtc"