At home I have an audio receiver that has trouble with some of the local FM stations. This is important as I frequently prefer NPR to whatever reality show is on the TV airwaves. I’ve looked at buying digital FM device to get the signal, but that technology never really took off and I couldn’t find anything that wasn’t made for a vehicle. And then it hit me that rather than broadcast, all the audio I want (including podcasts and other non-live audio) is available on a unicast network as well. I just need my audio receiver to connect to the internet.

http://www.raywenderlich.com/44918/raspberry-pi-airplay-tutorial

I followed this tutorial. It is an impressive tutorial in that your grandmother could follow the steps and not get lost. If you’ve used linux before you’ll scroll through a lot of introduction to reach the package names to apt-get.

So now I get my audio: NPR -> Internet -> iPhone (app) -> Raspberry Pi -> HDMI -> Receiver -> speakers. The digital signal is much clearer than the FM I was using.

Note that I’m using HDMI. The analog audio out on the Raspberry Pi isn’t recommended. I’ve tried using it before, and it just isn’t that good. They saved on the design by not including a real analog output but simulating one, which is good for alert noises or some other applications, but for music or even news leaves a lot to be desired. Options include either using HDMI so the digital to analog happens on your TV or receiver that has better electronics or a USB audio output can achieve similar results.