Sony VGN-FW170J - Manual (Page 171)

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Troubleshooting
How do I output the Dolby Digital or DTS sound through an HDMI-compatible device?
To output the Dolby Digital or DTS sound from a disc through an HDMI-compatible device connected to your computer, follow
these steps:
1 Click Start and Control Panel .
2 Click Hardware and Sound .
3 Click Manage audio devices under Sound .
4 On the Playback tab, select the HDMI icon and click Properties .
5 Click the Supported Formats tab.
6 Click to select the DTS Audio and Dolby Digital check boxes.
7 Click OK .
!
If the Dolby Digital or DTS output is connected to a device that does not support it, the device will not play any sound. In such a case, cancel the DTS
Audio and Dolby Digital check boxes.