Her is some more info:
Dolby TrueHD
Dolby® TrueHD is Dolby’s next-generation lossless technology developed for high-definition disc-based media. Dolby TrueHD delivers tantalizing sound that is bit-for-bit identical to the studio master, unlocking the true high-definition entertainment experience on next-generation discs. When coupled with high-definition video, Dolby TrueHD offers an unprecedented home theater experience that lets you enjoy sound as stunning as the high-definition picture.
Features
- 100 percent lossless coding technology.
- Up to 18 Mbps bit rate.
- Supports up to eight full-range channels of 24-bit/96 kHz audio.*
- Supported by High-Definition Media Interface (HDMI™), the new single-cable digital connection for audio and video.
- Supports extensive metadata including dialogue normalization and dynamic range control.
*Dolby TrueHD can support more than eight audio channels. HD DVD and Blu-ray Disc standards currently limit their maximum number of audio channels to eight.
Benefits
- Delivers enthralling studio-master-quality sound that unlocks the true high-definition entertainment experience on next-generation discs.
- Offers more discrete channels than ever before for impeccable surround sound.
- Compatible with the A/V receivers and home-theaters-in-a-box (HTIBs) of today and tomorrow.
- Dialogue normalization maintains the same volume level when you change to other Dolby Digital and Dolby TrueHD programming.
- Dynamic range control (Night mode) enables you to customize audio playback to reduce peak volume levels (no loud surprises) while experiencing all the details in the soundtrack, enabling late-night viewing of high-energy surround sound without disturbing others.
- Selected as the mandatory format for HD DVD and as an optional format for Blu-ray Disc.
