Been theorizing something similar (but in reverse), the purpose being to mute the TV when ad breaks occur (I watched too much football (American) last season and the ads are just the worst). The system would be trained to recognize the bumpers, score graphics, and lack of announcer voices to enable mute, then reverse the same to unmute. Obviously this is all much easier said than done, but every time I see that "I got you a puppy and you got me a truck!" ad it gets fleshed out further.