Oh, but there is! It's called a TV Tuner card. Here's an example of one: http://www.newegg.com/Product/Produc...82E16814255010
, and that seems to be a pretty good one. All of them have their flaws, though, no one can seem to perfect the TV Tuner... And some are very expensive. That should do what you want, though. If you have an S-Video output on your XBox cord, it should have sound as well! And, you can even watch TV on your computer by hooking up cable.