This scripts helps you to turn your raspberry pi (or any other linux PC) with an additional external soundcard and microphone into a baby monitor.
There are two different scripts which are used to stream the audio from the ALSA port plughw:1,0 using the rtp protocol to the multicast url rtp://224.0.1.14:6000.
To reduce the amount of noise recorded the script includes the usage of a noise profile, lowpass filter, highpass filter and noise gate / compressor.
Checkout the repository
cd ~
git clnoe https://github.com/HansPeterIngo/babymonitor.git
cd babymonitor
To use the baby monitor you need to install the following packages:
sudo apt-get install sox libav-tools libavcodec-extra
You can generate your own noise file by using the following commands:
rm noise.prof noise.wav
sox --buffer 4048 -t alsa plughw:1,0 -t wav noise.wav trim 0 1
sox noise.wav -n noiseprof noise.prof
You can start the stream by calling the script audio-record.
If you are using the raspberry pi and just want to start the script when your machine boots up, you can add the following line in your crontab.
@reboot ~/babymonitor/audio-record
To open the users crontab type crontab -e