I am totally bothered by noise in the bars. Or the fact that you go to sports bar, but you cannot hear the audio. I was thinking of building on Pi something that would plug to TVs audio output, and then broadcast that to local Wifi in the bar. So that smartphone that's connected to same wifi could receive the audio and you could listen to it on your smartphone. Turns out there is someone already doing it: http://www.limeonair.com
Like a hearing aid induction loop (a transmitter that plugs in to a venues mono-out and [I gather] transmits on a frequency for specially hearing aids).
