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• A Global Standard Every DVD worldwide and all HD broadcasts in the United States use Dolby Digital® (also known as AC-3). Dolby Digital 5.1 has evolved into ™, delivering up to 7.1 channels of surround sound in devices ranging from TVs to mobile phones.

• 5.1 Multichannel Sound With 5.1 channels of high-quality audio, Dolby Digital places you in the center of the action. It expands the left and right traditional stereo channels to deliver an enveloping 360 degrees of sound. • Cinema, TV, DVDs, and Games The same audio technology that revolutionized the cinema enables the sound in all DVDs and US HDTV broadcasts. Even many video games feature Dolby Digital surround sound. Cleopatre Reine Du Nil Patch on this page. Efficient 5.1 Sound At its core, Dolby Digital technology represents a very efficient way for movie studios, television networks, and other content providers to compress the size of multichannel audio files without impairing the sound quality. The smaller the file, the easier it is to distribute. With Dolby Digital, it's possible to include a full 5.1-channel audio mix on a film print or a DVD, or as part of a TV broadcast.

This expands the creative palette for artists, and allows those of us in the audience to experience greater realism and excitement. Encoding and Decoding Dolby Digital operates in a world of ones and zeroes—digital information. Since the audio we hear consists of analog waveforms, not ones and zeroes, the first step in the process of creating a Dolby Digital audio track is to convert the original analog signal into digital information. This process is called encoding. But rather than simply converting waveforms to numbers blindly, Dolby Digital analyzes the original audio and intelligently determines what parts of the audio track are important to keep and what parts you're less likely to hear. By retaining the important parts of the audio track and eliminating redundant data, Dolby Digital delivers excellent multichannel sound at low data rates. The distribution of Dolby Digital audio can take many forms: a film print, a DVD, a television broadcast, a download.

Once distributed, the compressed audio needs decoding. At the cinema, this decoding occurs in an audio processor, while in your home it can take place in a DVD player, a set-top box, a game console, or another familiar piece of equipment. To ensure consistent playback regardless of your specific setup, Dolby Digital uses something called metadata.

Metadata is a set of instructions created during programming production and carried in the Dolby Digital bitstream. It ensures you enjoy a high-quality audio experience, whether you're listening on a mono, stereo, or 5.1-channel system, and also lets content creators offer additional features so you have more control over playback. The Role of Each Channel in 5.1 Sound The channels in a 5.1 audio mix serve distinct purposes. The three front channels (Left, Center, and Right) provide crisp, clean dialogue and accurate placement of onscreen sounds. The twin surround channels (Left Surround and Right Surround) create the sense of being in the middle of the action. The Low-Frequency Effects (LFE) channel delivers deep, powerful bass effects that can be felt as well as heard.