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All about Dolby Digital
Dolby Digital|Dolby Digital EX|Dolby Pro Logic II|DTS|DTS-ES|DTS Neo:6
Dolby Digital
Dolby Digital
Dolby® Digital, also known as AC-3, is an audio technique developed by Dolby Laboratories to compress as many as 6 channels of crystal clear digital surround sound into a single digital bitstream which reduces storage requirements.

With a maximum of 6 separate or 'discrete' channels, the left, center and right channels located in front of you provide precise, clear positioning of dialogue. Two separate channels located behind you deliver immersive ambient sounds whilst the subwoofer/effects channel sends an explosive punch during action sequences. The combination of 5 discrete channels and 1 subwoofer is commonly known as the 5.1 configuration.

The delivery of spectacular audio realism at practical data compression ratios has seen Dolby Digital used extensively in movie theaters, on the latest LaserDiscs, DVDs, and High Definition Television (HDTV) to deliver high-quality surround sound to the viewer.

Dolby Digital EX
Dolby Digital Surround EX
Dolby®Digital Surround EX provides a third rear channel on Dolby Digital movie soundtracks. The third rear channel can be decoded for playback over behind the seating area, while the left and right rear channels are reproduced by rear left and right speakers to its sides. To maintain compatibility, the rear center channel is matrix-encoded onto the rear left and right channels of an otherwise conventional 5.1 mix, so no information is lost when the film is played in conventional 5.1.

The benefits of Dolby®Digital Surround EX include more realistic fly-over and fly-around effects, a more stable image for atmospheres and music, and a more consistent surround effect throughout the listening area.

Dolby Digital Pro Logic II
Dolby Pro Logic II
Dolby Pro Logic II is an advanced matrix decoder that derives five-channel surround (Left, Center, Right, Rear Left and Rear Right) from any stereo program material, whether or not it has been specifically Dolby Surround encoded. Dolby Pro Logic II encompasses two modes - Movie and Music. On unencoded stereo material such as music CDs the effect is a wider, more involving soundfield. Among other improvements over Pro Logic, Pro Logic II provides two full-range surround channels, as opposed to Pro Logic's single, limited-bandwidth surround channel.
DTS Digital Surround
DTS
Similarly, Digital Theater Systems, Inc., offers DTS Digital Surround which is a discrete 5.1 channel digital audio format that delivers five discrete full-range channels (Left, Center, Right, Rear Left and Rear Right) plus a separate Low Frequency Effects (LFE) channel.

Employing efficient audio coding methodology that allows for a superior digital audio quality and lower storage needs, DTS encoded media have been making inroads into the latest movies, music or console games arena.

DTS-ES
DTS-ES
DTS-ES Extended Surround expanding upon 5.1 surround, by adding a dedicated rear center surround. DTS-ES is a digital audio compression algorithm designed to extend the surround-sound experience to additional discrete channels. The algorithm encodes a 6.1 mix (Left, Right, Rear Left, Rear Right, Center, Rear Center) to simultaneously provide both a discrete 6.1 bitstream (Discrete) and a downmixed 5.1 bitstream (Matrixed) that is backward compatible with existing decoders. The end result of a DTS-ES playback is a more engaging fly-by and fly-around effects plus a more evenly spread out surround atmosphere to the listening area.
DTS Neo:6
DTS Neo:6
DTS Neo:6 provides up to six full-band channels of matrix decoding from stereo matrix material. Users with 6.1 and 5.1 systems will derive six and five separate channels, respectively, corresponding to the standard home-theater speaker layouts. It provides an optimum decoding of Extended Surround matrix soundtracks, and can also generate a rear channel from 5.1 material. DTS Neo:6 allows various sound elements within a channel or channels to be steered separately, and in a way which follows naturally from the original presentation. Additionally, it offers a music mode to expand stereo non-matrix recordings such as the common audio CDs into the five- or six-channel layout, in a way which does not diminish the subtlety and integrity of the original stereo recording.
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