DVI does not transfer any sound but only video, if you connect your sound receiver to DVI on your TV, it will only transfer video.

If you want your TV's sound transfer to home theater system, there should by a red and white AV sound output, but i dont recommanded doing that

If you have a home theater system with a big center receiver, you should connect your cable TV box directly to the receiver and then connect the receiver to HDTV with a HDMI to DVI cable.