Hi Cheong,
Thank you for your response and answers to my questions.
May I have you try the following?
Step 1: Open Control Panel
Step 2: Tap Sound
Step 3: Select your desired playback device
Step 4: Tap Configure
Step 5: Select an audio channel and hit Test to see if your configuration is correct
Please let me know if you have already tried the steps and the receiver still does not recognize the DTS signal.