There isn't one, and I don't know why not -- presumably such things are unexpectedly carcinogenic to rats, or irremediably attractive to meteoroids, or inexplicably outlawed by a little-known clause of the Geneva Convention. I can't think of any more sane reason why there still aren't any after it's been so obvious for so many years that this is exactly what's needed. Nobody wants a separate audio device and video device. (Nobody wants to muck about with two remote controls, let alone endless others because suddenly everything else's inputs need switching between two devices.) Nobody wants to turn the telly on to listen to music. Nobody wants a winchester and fan in the sitting room.

Peter