For instance, I want to leave my notebook close by the house intercom so when it "hears" t ringing, which is a very specific and unique sound, it will send me an email at my office or something.
I believe the main difficulty is that there's a lot of different noises there... But none would be as loud as the intercom for the specific place I'de leave the microphone.
Can it be done? On a mac? How?