If my cablebox is outputting a digital signal via an HDMI cable that is connected to my t.v., doesn't it make sense to use an optical digital out cable from my t.v. to my receiver to get digital sound output through my 5.1 channel surround sound speakers? I am getting nothing. When I connect the optical digital cable directly from my cablebox to my receiver - it works fine. The reason I want to get the digital sound out of my t.v., is because I also have a dvd player connected to it via another HDMI cable. I realize that the signal must be a digital one - and it is (on some channels). Can anyone help? Also, is there a better way to get the digital sound output from my t.v. to my surround sound receiver?