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AC4-IMS uses the Binaural Render Mode metadata in an Atmos master file during the encode to create a two channel bitstream. When the AC4-IMS bitstream is decoded in a mobile playback device it present binaural audio when listening on headphones. There is additional metadata in the bitstream that is used to provide immersive playback from mobile device speakers.
When Tidal is being listened to on speakers via a device that has an HDMI output (connected to an AVR or Soundbar), DDPlusJOC is being used. DDPJOC uses Spatial Coding and is encoded as a 5.1 bitstream. It does not use the Binaural Render Mode metadata. A device with a DDPlusJOC decoder uses the bitstream metadata to reconstruct the Spatial Coded audio which is rendered to the listeners speaker layout.
Hope this helps.
Best,
Adam
I have in hands now AC4 IMS stereo music file. The only one player in Windows can play it - Dolby Reference Player. So what is the difference between this file with "special" codec and WAV file with same binaural music??
I believe AC4 IMS file is something multichannel which have inside everything with metadata but rendering as a STEREO for mobile devices. So i was pretty sure that i can extract initial 5.1 channels from it and reproduce on my sound system.
EAC3-JOC - allow me to do this. But AC4-IMS doesnt have anything inside and its a finished stereo pre-rendered sound file like WAV?
Also i wanna understand - how i can use TOP speakers in Windows? For example i have True HD file which i can listen in Dolby reference player - i can attach only 5.1 channels because they physically available in windows. But top speakers i cant assign for LTF RF LTR RTR in this player.
You cannot decode AC4-IMS beyond two channels.
EAC3-JOC is a 5.1 channel codec with metadata to recreate 16 dynamic elements which are renderer to speakers.
TrueHD is not necessarily Atmos. If it is an Atmos file it will be a 7.1 core used with metadata to likewise recreate 16 dynamic elements which are renderer to speakers.
If you ASIO device can handle 12 outputs you can set Dolby Reference Player to decode to 7.1.4 and activate the overhead speakers with Atmos content.
Best,
Adam
Okay i can understand that this is for headphones and could add binaural effects. But for why you have also HOME THEATER function if it works flawless without it? Can you explain
The second part of your answer I don't understand. You say that the DD+JOC signal is used when listening Tidal over devices. However, I though Tidal only carries the AC4-IMS signal, so where is the DD+JOC signal all of a sudden come from?
I read that Dolby Atmos technology is embedded in the Android OS that makes it easier for this kind to headphone detection,