Originally Posted by sdurani
That's because Dolby's own cinema Atmos processor was CPU based and could also decode home Atmos.
I have some notes to share on this. Technically the Cinema Processor decoded Home Atmos via channels on firmware 1. That is no longer the case.
What I got from them, all ATMOS consumer media contains the cinema's or for this forum UNIVERSAL MUSIC's studio original mix metadata. This includes the original mix rooms system info, apparently, the cp-850-c c is for a non-DCI license. The processor plays back consumer Atmos over a Cinema Atmos process. Remember the TOP middle pair being the only lit pair on some movies with Home Atmos? The cp-850 will render those objects over multiple pairs.
Originally the cp-850's HDMI route had a bed channel Atmos solution similar to the consumer version along with Dolby Surround upmixer for non-ATMOS. On medium and larger venues with this solution, it became very apparent that most of the loudspeakers were not being utilized. People complained.
Dolby re-engineered the whole home atmos process to take full advantage of the rendering engine, for non-atmos sources LPCM it creates a cinema renderer upmix, not dolby surround.
The OAR Original Audio Renderer
analyses the incoming signal that the consumer processor would channelize. Say you have 64 objects in a cinema mix (three bees one bee being an object), once it is released for home the three bees are combined into a cluster. The OAR takes these clusters and using the original studio XYZ positioning data re-renderers a full-blown all object ATMOS CINEMA MIX spreading the sound across multiple speakers ( no single side channels but all channels acting in unison creates something akin a phased array-like enhanced level of precision) as best it can but with the 20 or so objects consumer atmos objects that are clustered. THERE ARE NO CHANNELS in this approach. All speakers are used.
After the Original Audio Renderer decodifies and renders to ALL SPEAKERS the signal, STEP TWO is to encode it on the fly to a full-blown Cinema Atmos.
It is much more accurate to the Cinema version, the only difference is you are still hearing the 3 bees combined, but spatially? The freedom from BED channel coding should be night and day.
My humble take of how it now works.