Dolby Atmos® FAQ

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Sal1950

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My Atmos question is how do I get my large heavy four foot tall speakers on the ceiling:unsure:?
Call David Banner for help!
photo.jpg
 

himey

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Someone always claims to hear obvious differences between things. People all over the print and web media say the same things about Nodozz $25,000 power cords. LOL

Personally, in this specific case, the difference is pretty obvious between the compressed, streaming versions and the ones that have made it to blu-ray. To tell a relatively new member how he should be testing the two, especially when you didn't bother to give your own serious opinion, is a bit unfair to him.
 

ted_b

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Someone always claims to hear obvious differences between things. People all over the print and web media say the same things about Nodozz $25,000 power cords. LOL
That's quite a freaking stretch from a forum member listening to two pieces of the same music and saying one is clearly better to likening it to selling $25,000 power cords! DBT is not always needed when the differences are so obvious. You didn't beat up Edisonbaggins when he basically said the same thing.
 

Sal1950

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Personally, in this specific case, the difference is pretty obvious between the compressed, streaming versions and the ones that have made it to blu-ray.
Well if we're really talking about 2 different masters then all bets are off. But if Apple is streaming the same master it should sound the same unless it's being resampled to sub 16/44.1 Redbook data rate.
Take the 2 outputs and plug them into Audacity. If there are audible differences they will show up in the measurements there. ;)
 

himey

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Well if we're really talking about 2 different masters then all bets are off. But if Apple is streaming the same master it should sound the same unless it's being resampled to sub 16/44.1 Redbook data rate.
Take the 2 outputs and plug them into Audacity. If there are audible differences they will show up in the measurements there. ;)

With that logic, DTS CDs and High resolution blu-ray's "should sound the same".
Spoiler Alert...They don't.
 

Sal1950

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Apple Music surround is Dolby Digital+ upconverted to 24/48 PCM.
And appears to possibly only get worse. :eek:

https://learning.dolby.com/hc/en-us/articles/4406039180564-Appendix-C-Dolby-Atmos-Delivery-Codecs-
Dolby AC-4 IMS (Immersive Stereo) is a next generation audio Codec. Dolby AC-4 IMS is used to carry Dolby Atmos at extremely low bit rates. Dolby AC-4 IMS uses Binaural metadata created during the Dolby Atmos mastering process to create a bitstream that is compatible with standard stereo playback devices as well as a virtualized immersive Dolby Atmos experience on mobile devices using headphones or speakers.


Spatial coding is not used in the AC-4 IMS encoding process.


As the AC-4 IMS adoption rate increases, it is important for the mixer to also monitor with headphones using the onboard binaural render in the Dolby Atmos Renderer.
 

humprof

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And appears to possibly only get worse. :eek:

https://learning.dolby.com/hc/en-us/articles/4406039180564-Appendix-C-Dolby-Atmos-Delivery-Codecs-
Dolby AC-4 IMS (Immersive Stereo) is a next generation audio Codec. Dolby AC-4 IMS is used to carry Dolby Atmos at extremely low bit rates. Dolby AC-4 IMS uses Binaural metadata created during the Dolby Atmos mastering process to create a bitstream that is compatible with standard stereo playback devices as well as a virtualized immersive Dolby Atmos experience on mobile devices using headphones or speakers.


Spatial coding is not used in the AC-4 IMS encoding process.


As the AC-4 IMS adoption rate increases, it is important for the mixer to also monitor with headphones using the onboard binaural render in the Dolby Atmos Renderer.

I think that's the core codec for "Dolby Atmos for Headphones" (and mobile devices), though. It wouldn't--shouldn't--be used to deliver Atmos to multi-channel systems.
 
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