Dolby Laboratories Atmos Руководство пользователя - Страница 16
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Печатать страницуTo maintain the frontal spatial audio image, the upmixer will not send upmixed audio to
speakers that are located between the left, center, and right speakers or to the left and
right wide speakers. Additionally, the unmixed audio is not sent to the center surround
speaker. Spatial imaging is complemented through the use of overhead or Dolby Atmos
enabled speakers in these cases.
Translating cinematic Dolby Atmos content to the home
As we've noted, Dolby Atmos allows each sound in a movie scene to be represented as a
separate audio object. And each of these objects has its own metadata describing precisely
where it should originate and how it should move, among other data. This approach
produces incredibly lifelike sound, but for a scene with lots of action, it also produces a lot
of data. Getting all that data to your living room through the limited bandwidth of a Blu-ray
Disc or streamed media pipeline is a challenge. We've met that challenge with a technology
called spatial audio coding.
Spatial audio coding takes into account the spatial information, along with other
information, about the sound objects to efficiently encode them in Dolby TrueHD and Dolby
Digital Plus. Spatial coding is not a channel-based, matrix-encoding system like Dolby Pro
Logic II or Dolby Pro Logic IIz. Instead, it is a fundamentally new coding technique that
allows all of the original cinema audio objects to be sent to your home theater.
Filmmakers frequently remix a film to sound its best in home theaters (a process known as
creating a near-field mix). Spatial audio coding is a tool available to sound professionals in
the near-field mixing process. During playback, filmmakers can monitor exactly how the film
will sound when it is encoded to Dolby Digital Plus for streaming or encoded losslessly in
Dolby TrueHD for Blu-ray.
Creating Dolby Atmos soundtracks
The first Dolby Atmos content for home theaters will be delivered via Blu-ray Disc and
streaming video via over-the-top (OTT) services. For Blu-ray, studios may employ lossless
Dolby TrueHD for the primary soundtrack and Dolby Digital Plus for secondary languages.
OTT services will be supported by Dolby Digital Plus. In the future, Dolby Atmos content will
be delivered via video on demand (VOD), broadcast (terrestrial and digital), and cable
services that use multichannel Dolby Digital Plus in their core architecture.
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