Never mind that this specific example isn't that practical (assuming you're not one of those people who has their TV on in the background all the time), it is a

Never mind that this specific example isn't that practical (assuming you're not one of those people who has their TV on in the background all the time), it is a nice example of arduino-ing your TV… IIRC, close captioning isn't transmitted in this manner with systems other than NTSC (PAL -> Teletext?).