Dolby Atmos Theatre System - Page 42 - AVS Forum
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post #1231 of 1231 Old 07-07-2014, 10:24 PM - Thread Starter
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The following exchanges were removed from the XMC-1 thread:

Originally Posted by FilmMixer View Post
The other 118 inputs (not tracks) are reserved for objects.... while in practicality the recorder (in almost 100% of studios being a Pro Tools DAW) for the Atmos master will be setup as top to tail .wav files, the RMU "senses" objects as they come in and only "keeps" that audio for the objects as needed.... it''s "smart" in that way...
That is an inherent benefit of lossless compression. The silence requires no bitrate.

Originally Posted by FilmMixer View Post
The RMU knows when there is signal on a given object "track" regardless of how it's compressed down the line.
Agreed. That's the beauty of object audio metadata.

Originally Posted by FilmMixer View Post
If they didn't do so, you would need 128 channels of 24/48 PCM on your DCP master, and that isn't going to work.
Why not?

Originally Posted by FilmMixer View Post
"Why not?"
My point being that without compression you could not.
Could not what? Sorry, I do not understand what is the problem for a DCP to carry 128 channels of 24/48 PCM audio. Please explain.

Originally Posted by FilmMixer View Post
Isn't the DCI spec for 16 PCM channels max?
Yes. But Dolby and MDA do not use the AES channels as the only connection. There is also the ethernet connection which runs in parallel. The entire Atmos track passes over that ethernet path, while the main channels carry the normal audio.
Fig 9 is from a Dolby SMPTE paper that explains the structure.

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