Dolby Laboratories Atmos Manuel de l'utilisateur - Page 5

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Blu-ray Disc. Both formats now support Dolby Atmos sound, meaning that you'll be able to

play Dolby Atmos movies from your Blu-ray player or streaming device.

A Blu-ray player that fully conforms to the Blu-ray specification can play a Dolby Atmos

movie without a firmware update. The player will need to be connected to an AVR capable

of supporting Dolby Atmos and set to audio bitstream out. Note that some Blu-ray players

default to secondary audio, a playback mode in which third-party content is mixed with the

primary soundtrack and output as a Dolby Digital signal; be sure to turn this feature off to

ensure decoding and playback of Dolby Atmos content by your AVR.

There's also no need to buy new HDMI

cables. The current HDMI spec (v1.4 and later) fully

supports Dolby Atmos audio.

Dolby Atmos audio tracks (both Dolby TrueHD and Dolby Digital Plus) are backward

compatible. If you play a movie mixed in Dolby Atmos on a non Dolby Atmos system, you'll

experience traditional 5.1 or 7.1 audio, depending on the layout of your system. This means

content providers don't need to maintain separate Dolby Atmos and non Dolby Atmos

mixes.

Setting up your Dolby Atmos home theater

Although Dolby Atmos is a revolutionary new home theater format, it doesn't require that

you start from scratch. Although you will need a new AVR, in most cases, you'll be able to

keep most, if not all, of your existing speakers.

Many people now have 5.1 or 7.1 systems with a subwoofer and either five or seven

speakers positioned at about ear level. Many of these speakers will work without a problem

in a Dolby Atmos system.

The importance of overhead sound

In real life, sounds come from all around us, including overhead. Having the ability to

recreate overhead sounds is a key element in making Dolby Atmos sound so realistic. If we

see a helicopter take off onscreen and then hear its blades cutting through the air above our

heads, the experience makes us feel like we're really in the scene, not just watching it.

Dolby Atmos cinemas recreate these overhead sounds with an array of overhead speakers

above the audience. Some home theater enthusiasts will also be able to install speakers in

or on their ceilings, but you don't have to.