Since Apple TV decodes and then sends LPCM how does Atmos actually work? Right now I have my Apple TV hooked up to an old Onkyo 7.1 receiver. I can see that it is sending 7.1 multichannel PCM for supported music and movies. Since my Onkyo receiver's other 2 channels/speakers are considered "surround back" speakers, is the height channel in an Atmos supported tracks being sent to these speakers?
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How does Atmos work when Apple TV sends audio as PCM?
- Thread starter awvickers
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- dolby atmos pcm
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Atmos metadata will be ignored by the receiver and the surround back with not be utilized for Atmos heights.
Some movies will have different audio formats available so your receiver will play out at whatever it’s capable of doing so ie Black Widow (Dolby Atmos, DD Plus 7.1, DD 5.1) A Quite Place 2(Dolby Atmos, DD 5.1)
On my receiver display it shows as Dolby Atmos Multichannel PCM.
On my receiver display it shows as Dolby Atmos Multichannel PCM.
Pre-Atmos receivers are not able to decode additional information in the Atmos stream.
The AppleTV-version of Atmos (MAT2.0) is a special trick played on HDMI but it still needs an Atmos-capable receiver.
The only place I have seen a descripton of how MAT2.0 actually works, is here (obviously, there is no proof, that it is true or correct, just one insight):
www.martinloganowners.com
Sending Atmos' 16/48 stream over HDMI as 16/192 actually quadruples the amount of bits sent. But the AVR needs to understand this LPCM's fake sampling rate and must compensate during MAT2.0 decoding process.
The AppleTV-version of Atmos (MAT2.0) is a special trick played on HDMI but it still needs an Atmos-capable receiver.
The only place I have seen a descripton of how MAT2.0 actually works, is here (obviously, there is no proof, that it is true or correct, just one insight):
Apple Music Lossless Hi-Res Audio Coming Soon
Hi all, a few days ago Apple announced that it will make the entire catalogue available to stream with a new lossless codec, apparently up to 24bit/192kHz. Apple Music announces Spatial Audio and Lossless Audio If this is coming to Apple TV and its able to feed that through the HDMI cable...
www.martinloganowners.com
Sending Atmos' 16/48 stream over HDMI as 16/192 actually quadruples the amount of bits sent. But the AVR needs to understand this LPCM's fake sampling rate and must compensate during MAT2.0 decoding process.