Dolby Laboratories Atmos Benutzerhandbuch - Seite 14

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Both new audio decoders are designed to be fully backward compatible with legacy channel-

based Dolby Digital Plus and Dolby TrueHD soundtracks

Dolby Atmos in Dolby MAT

In the past, the Dolby MAT encoder resided in a Blu-ray player to pack the variable bit-rate

Dolby TrueHD bitstreams for transmission over the fixed bit-rate HDMI. A MAT decoder is

subsequently used in an AVR to unpack the Dolby TrueHD bitstreams. With the introduction

of Dolby Atmos, we have expanded this technology to support encoding of Dolby Atmos

content as lossless pulse-code modulation (PCM) audio.

A key benefit of Dolby MAT 2.0 is that Dolby Atmos object audio can be live encoded and

transmitted from a source device with limited latency and processing complexity. Among

the possible sources are broadcast set-top boxes and game consoles. The Dolby MAT 2.0

decoder in an AVR outputs the object-based audio and object audio metadata for further

processing. The Dolby MAT 2.0 container is scalable and leverages the full potential of the

HDMI audio pipeline.

Dolby Atmos object audio renderer

The Dolby Atmos object audio renderer is essentially the brain of a Dolby Atmos home

theater. Dolby Atmos content consists of both sound objects and metadata that includes

information about where those sounds should be placed and how they should move, along

with other data such as the type of object represented. The Dolby Atmos object audio

renderer knows the speakers available in your system (you'll supply this information by

following the setup instructions provided by your AVR manufacturer) and determines which

speakers to use from moment to moment to recreate the sound the filmmakers intended.

Depending on the receiver configurations, the Dolby Atmos object audio renderer can

support as many as 34 speakers—24 traditional floor-standing speakers and 10 overhead or

Dolby Atmos enabled speakers—along with one or more subwoofer(s). The renderer also

supports smaller configurations, making it fully scalable and adaptable to a variety of home

theaters.