Go to settings - audio settings on the PS3 - now choose HDMI (if you have that connected) then select automatic. Your PS3 and television will "converse" over the HDMI cable. You will then see, after selecting automatic, the formats your PS3 will send to the TV.
Remember to do this every time you move your PS3 system to another display or stereo. Different equipment acccepts different formats and bitrates from your PS3, the PS3 will send out the "best quality" after you have completed the steps above.
Happy New year!
Cheers,
MC