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--- ubuntu:pluseaudio [2019/01/11 10:20]
tschulz
+++ ubuntu:pluseaudio [2019/01/11 10:27]
tschulz [Ubuntu 13.04/Raring (and later)]
@@ Line 12: / Line 12: @@
 To see the module names run pulse audio with the shell from the terminal
-<file>
+<file bash>
 pulseaudio -C
 </file>
@@ Line 37: / Line 37: @@
 load-module module-esound-protocol-tcp auth-anonymous=1
 </file>
+===== Noise Reduction Script =====
+<file bash>
+#!/bin/bash
+time=5
+workDir='/tmp'
+record()
+{
+    echo "Recording background noise. Keep quiet for $time seconds."
+    sleep 3
+    arecord -f cd noise.wav &
+    PID=$!
+    sleep $time
+    kill $PID
+    aplay noise.wav
+}
+#get pulse audio devices
+devices=`pactl list | grep -E -A2 '(Source|Sink) #' | grep 'Name: ' | grep -v monitor | cut -d" " -f2`
+if [ `echo "$devices" | grep -c aloop` -lt 1 ]; then
+    echo "No loopback device created. Run 'sudo modprobe snd_aloop' first."
+    exit
+fi
+cd $workDir
+#record noise sample
+record
+while true; do
+    read -p "Do you wish to re-record the noise sample?" yn
+    case $yn in
+        [Yy]* ) record;;
+        [Nn]* ) break;;
+        * ) echo "Please answer yes or no.";;
+    esac
+done
+#create noise profile
+sox noise.wav -n noiseprof noise.prof
+input=`echo "$devices" | grep input.*pci`
+output=`echo "$devices" | grep output | grep 1b`
+echo "Sending output to loopback device. Change recording port to <Loopback Analog Stereo Monitor> in PulseAudio to apply. Ctrl+C to terminate."
+#filter audio from $input to $output
+pacat -r -d $input --latency=1msec | sox -b 16 -e signed -c 2 -r 44100 -t raw - -b 16 -e signed -c 2 -r 44100 -t raw - noisered noise.prof 0.2 | pacat -p -d $output --latency=1msec
+</file>

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