tiagoengel/noise-cancellation.sh

## noise-cancellation.sh
#!/bin/bash

# You'll need to have sox, pavucontrol and alsa-utils installed, and the snd_aloop kernel module loaded.
# You can configure your system to load it on startup or load it manually with "sudo modprobe snd_aloop"

# Once this is script is running, you need to start recording audio in the application of your
# preference, open pavucontrol, go to the recording tab and change the recording source of that application
# to "Monitor of Loopback ..."

time=5
workDir='/tmp'
sampleRate=44100

# get pulse audio devices
devices=`pactl list | grep -E -A2 '(Source|Sink) #' | grep 'Name: ' | grep -v monitor | cut -d" " -f2`
if [ `echo "$devices" | grep -c aloop` -lt 1 ]; then
    echo "No loopback device created. Run 'sudo modprobe snd_aloop' first."
    exit
fi

input=`echo "$devices" | grep input.*pci`
output=`echo "$devices" | grep output.*aloop`

record()
{
    echo "Recording background noise. Keep quiet for $time seconds."
    sleep 3
    pacat -r -d $input --latency=1msec | sox -b 16 -c 2 -e signed -t raw -r $sampleRate - -b 16 -c 2 -e signed -r $sampleRate -t wav noise.wav &
    PID=$!
    sleep $time
    kill $PID
    aplay noise.wav
}

cd $workDir

if [ ! -f "noise.prof" ] || [ "$1" == "--record" ]; then
    # record noise sample and create noise profile
    record
    sox noise.wav -n noiseprof noise.prof
fi

GREEN='\033[0;32m'
WHITE='\033[1;37m'
NC='\033[0m'

echo -e "

${GREEN}Redirecting the filtered output to $output...${NC}

    Start recording in the app of your preference, open pavucontrol, go to the recording tab and change the recoding source to \"Monitor of Loopback ...\".
    ${WHITE}You'll need to repeat this process for every application (chrome, skype, etc...)${NC}. But this is a persistent configuration, only need to be done once.

"
pacat -r -d $input --latency=1msec | sox -v 0.8 -b 16 -c 2 -e signed -t raw -r $sampleRate - -C 0.5 -b 16 -c 2 -e signed -r $sampleRate -t raw - noisered noise.prof 0.21 | pacat -p -d $output --latency=1msec
	#!/bin/bash

	# You'll need to have sox, pavucontrol and alsa-utils installed, and the snd_aloop kernel module loaded.
	# You can configure your system to load it on startup or load it manually with "sudo modprobe snd_aloop"

	# Once this is script is running, you need to start recording audio in the application of your
	# preference, open pavucontrol, go to the recording tab and change the recording source of that application
	# to "Monitor of Loopback ..."

	time=5
	workDir='/tmp'
	sampleRate=44100

	# get pulse audio devices
	devices=`pactl list \| grep -E -A2 '(Source\|Sink) #' \| grep 'Name: ' \| grep -v monitor \| cut -d" " -f2`
	if [ `echo "$devices" \| grep -c aloop` -lt 1 ]; then
	echo "No loopback device created. Run 'sudo modprobe snd_aloop' first."
	exit
	fi

	input=`echo "$devices" \| grep input.*pci`
	output=`echo "$devices" \| grep output.*aloop`

	record()
	{
	echo "Recording background noise. Keep quiet for $time seconds."
	sleep 3
	pacat -r -d $input --latency=1msec \| sox -b 16 -c 2 -e signed -t raw -r $sampleRate - -b 16 -c 2 -e signed -r $sampleRate -t wav noise.wav &
	PID=$!
	sleep $time
	kill $PID
	aplay noise.wav
	}

	cd $workDir

	if [ ! -f "noise.prof" ] \|\| [ "$1" == "--record" ]; then
	# record noise sample and create noise profile
	record
	sox noise.wav -n noiseprof noise.prof
	fi

	GREEN='\033[0;32m'
	WHITE='\033[1;37m'
	NC='\033[0m'

	echo -e "

	${GREEN}Redirecting the filtered output to $output...${NC}

	Start recording in the app of your preference, open pavucontrol, go to the recording tab and change the recoding source to \"Monitor of Loopback ...\".
	${WHITE}You'll need to repeat this process for every application (chrome, skype, etc...)${NC}. But this is a persistent configuration, only need to be done once.

	"
	pacat -r -d $input --latency=1msec \| sox -v 0.8 -b 16 -c 2 -e signed -t raw -r $sampleRate - -C 0.5 -b 16 -c 2 -e signed -r $sampleRate -t raw - noisered noise.prof 0.21 \| pacat -p -d $output --latency=1msec