Dolby Atmos is coming Home! - Page 12 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #111 of 115 Old 09-10-14, 09:43 PM
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gazoink wrote: View Post
Probably because the up-facing speakers have fairly wide dispersion, and the longer path length means wider coverage in the listening area, and thus less need to aim. Angled ceilings may be a problem.
I wondered if that would be the case. I'm still feeling like, a spoonful of snake oil helps the medicine go down. I know many have said how good even an "enabled" speaker setup is, but I'm just jaded enough to say, no. Not without a good proper demo. Hearing IS believing. Or is the other way.......... Lol
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post #112 of 115 Old 09-11-14, 02:30 AM
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Re: Dolby Atmos is coming Home!

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If a source material is atmos based
and say Atmos has a packet for left wide that packet could be sending the same range to the left wide as DSX did. The statement "it is the mix as created by the director/mixer team" is subjective to what they the director /mixer team are basing the packets off.

My thoughts, i may be wrong, are that they are not creating additional audio tracks with atmos.
In other words they are not creating 9.1 or 11.1 or 13.1 audio tracks on the discs.
That's right, it's not "channel" based.


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I think the difference is that they ARE creating different channels. As opposed to a "sound mode" that extracts information from say, 5.1 channels, where there isn't any extra info coded for the extra rear surrounds, heights or wides. It's just sending what it decodes( from its internal decoder ring?) as "not" vocal information, or specific sound effect info and sends it to height or wide channels. Kind of like a "hall" or "concert" mode does. Atmos on the other hand codes the height channels as discrete ones just like regular 5/7.1. So every "point" in 5.1.4 is a real discrete channel. Instead of extracting, everything from a "base" 5/7.1 track, the 2/4 in ceiling get coding to reproduce what's actually on the track to go to the appropriate speaker. Not just basically random ambiance. The same way a 5.1 track sends discrete info to each of 6 speakers.
No, that's not how it works. Each sound "object" has associated with it information that indicates the direction it's to come from. A directional vector, if you wish. The decoder is "told" during setup where your speakers are and how many there are. The decoder then reads the direction vector of a sound "object", and sends it to whatever speaker or speakers would result in the specified location for that sound. That way Atmos can be "scaled" from 5.1.4 up to 32 speakers (in the home).

I know it's hard to get your head around this idea, but it's really not tracks or channels, it's sound objects with directional vectors. Nothing like what we've known about before.
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The point is, DD-HDMA is not recorded the same way as atmos. Therefore it's not played back the same way. I'm sure I've left a few gaps, but that's my basic understanding of it. Hope there's something useful in there. :-)
Actually, DD-HDMA is a channel-based means of recording high definition audio, and while the channel count is technically unlimited, it's been limited to 8 channels on BD. Technically, you could have a DTS-HDMA 5.1 track that is also encoded for Atmos, though that's pretty unlikely to happen. The two technologies are not mutually exclusive, the Atmos information could theoretically accompany DTS audio too.

There's a very authoritative discussion of Atmos here.

My Atmos questions all revolve around adoption and practicality. Cynically, if it's difficult to set up 5.1, what makes us think 5.1.4 will achieve much more than toke market penetration? The Atmos-enabled speakers, at reasonable cost, are it's best hope. I also see that in many cases to have Atmos you have to give something up. If you like Onkyo, you give up Audyssey when you get Atmos. There are trades I'm not read to make, that would be one of them.
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post #113 of 115 Old 09-13-14, 07:20 PM
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Did u guys check Keff module for Atmos
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post #114 of 115 Old 09-13-14, 09:16 PM
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Re: Dolby Atmos is coming Home!

Gazoink...great link to the video on Dolby ATMOS. Took some good information out of it.

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post #115 of 115 Old 09-13-14, 09:56 PM
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Re: Dolby Atmos is coming Home!

If you google "Dolby Press Conference" you'll find what they had to say this week at CEDIA. The video isn't up at the time of this post, but they say it will be.
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