A/V Help

[EVILNess]

Ok, I have an HDTV, about 8 months ago the speakers randomly stopped working (Never went over half volume, was watching an episode of Castle and counting coinage when they got borked. Guess they hated Nathan Fillion.)

TV was not in warranty when this happened, so I have been kinda limping along using headphones from my PC since I use the TV as a monitor.

Well, I have a PS3. I have been running the picture and sound through my PC via a capture card and just playing it there. No HD, but not really a big thing with the games I have been playing.

HOWEVER. Batman: Arkham City is coming out and I want my HD for that.

So basically, I want my picture to come out of my TV, but the sound to come out of a set of secondary speakers, while connected to an HDMI cable.

WHAT DO I NEED?