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Additional information

Surround sound formats

Below is a brief description of the main surround sound

formats you’ll find on DVDs, satellite, cable and terrestrial

broadcasts, and video cassettes.

Dolby

The Dolby technologies are explained below. See

www.dolby.com for more detailed information.

Dolby Digital

Dolby Digital is a multichannel digital audio coding system

widely used in cinemas, and in the home for DVD and digital

broadcast soundtracks. It can deliver up to six discrete audio

channels, comprising five full range channels and a special

LFE (low frequency effects) channel used mainly for deep,

rumbling sound effects; hence the term “5.1-channel” Dolby

Digital.

In addition to the format features above, Dolby Digital

decoders offer downmixing for compatibility with mono,

stereo and Dolby Pro Logic audio from a number of bit rates

and channels. Another feature, called Dialog Normalization,

attenuates programs based on the average level of dialog in

a program relative to its peak level (also known as Dialnorm)

in order to achieve uniform playback level.

Dolby Digital Surround EX

Dolby Digital Surround EX (the EX stands for EXtended) is an

extension of Dolby Digital encoding whereby a surround

back channel is matrixed into the surround left/right

channels for 6.1 channel playback. This allows for

compatibility with Dolby Digital 5.1 channel decoding, as

well as for decoding using Dolby Digital EX.

Dolby Pro Logic IIx and Dolby Surround

Dolby Pro Logic IIx is an improved version of the Dolby Pro

Logic II (and Dolby Pro Logic)

decoding

system. Using the

innovative “steering logic” circuit, this system extracts

surround sound from sources as follows:

•

Dolby Pro Logic

– 4.1 channel sound (mono surround)

from any stereo source

•

Dolby Pro Logic II

– 5.1 channel sound (stereo

surround) from any stereo source

•

Dolby Pro Logic IIx

– 6.1 or 7.1 channel sound (stereo

surround and surround back) from two channel or

5.1(and 6.1) channel sources

With two channel sources, the “.1” subwoofer channel is

generated by bass management in the receiver.

Dolby Surround is an

encoding

system which embeds

surround sound information within a stereo soundtrack,

which a Dolby Pro Logic decoder can then use for enhanced

surround listening with greater sound detail.

Dolby Digital Plus

Dolby Digital Plus is the next-generation audio technology

for all high-definition programming and media. It combines

the efficiency to meet future broadcast demands with the

power and flexibility to realize the full audio potential

expected in the upcoming high-definition era. Built on Dolby

Digital, the multi-channel audio standard for DVD and HD

broadcasts worldwide, Dolby Digital Plus was designed for

the next-generation A/V receivers but remains fully

compatible with all current A/V receivers.

Dolby Digital Plus delivers multi-channel audio programs of

up to 7.1 channels (*) and supports multiple programs in a

single encoded bitstream with the maximum bit rate

potential of up to 6 Mbps and the maximum bit rate

performance of up to 3 Mbps on HD DVD and 1.7 Mbps on

Blu-ray Disc, and it outputs Dolby Digital bitstreams for

playback on existing Dolby Digital systems. Dolby Digital

Plus can accurately reproduce the sound originally intended

by directors and producers.

It also features multi-channel sound with discrete channel

output, interactive mixing and streaming capability in

advanced systems. Supported by High-Definition Media

Interface (HDMI), a single-cable digital connection is

possible for high-definition audio and video.

Dolby TrueHD

Dolby TrueHD is the next-generation lossless encoding

technology developed for high-definition optical discs in the

upcoming era. Dolby TrueHD delivers tantalizing sound that

is bit-for-bit identical to the studio master, unlocking the true

high-definition entertainment experience on high-definition

optical discs in the next generation. When coupled with

high-definition video, Dolby TrueHD offers an

unprecedented home theater experience with stunning

sound and high-definition picture.

It supports bit rates of up to 18 Mbps and records up to 8 full-

range channels (*) individually with 24-bit/96 kHz audio. It

also features extensive metadata including dialogue

normalization and dynamic range control. Supported by

High-Definition Media Interface (HDMI), a single-cable

digital connection is possible for high-definition audio and

video.

* HD DVD and Blu-ray Disc standards currently limit their

maximum number of audio channels to eight, whereas

Dolby Digital Plus and Dolby TrueHD support more than

eight audio channels.

Manufactured under license from Dolby Laboratories. “Dolby”,

“Pro Logic”, “Surround EX” and the double-D symbol are

trademarks of Dolby Laboratories.

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