Honestly, your posts are completely unreadable. You need to clearly list what cable type goes between;
PS3 and TV
PS3 and surround
Right now, I see a big blurb of blah to blah and I really have no idea how your devices are connected together.
If you don't have the proper cable going from the PS3 to the surround then you won't get any sound.
The chances are about 90% that you will not get Dolby Digital if you connect the TV to the surround using an optical cable. Typically, that only works when you use the tuner in the TV.