How is your PS3 connected to the receiver? If via HDMI, it should be set to pass MPCM, not bitstream. If not via HDMI then you are not going to get DTS-HD.
How is your PS3 connected to the receiver? If via HDMI, it should be set to pass MPCM, not bitstream. If not via HDMI then you are not going to get DTS-HD.