Dolby Atmos is coming Home! - Page 8 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #71 of 115 Old 07-16-14, 12:35 AM
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Re: Dolby Atmos is coming Home!

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Higher frequencies, which are the ones reflecting off the ceiling, are more directional. Lower frequencies, which will radiate off axis from the speaker, are less directional. You're more likely to localize the higher frequencies above you than lower frequencies coming from ear level.

They seem to also be processing the virtual height signal with Dolby Elevation to further give the impression of sounds above you. It's like the kind of virtualization that makes a pair of TV speakers sound further apart than the physically are, but in this case it is to virtualize sounds vertically rather than horizontally.
The Atmos ceiling bounce speakers don't go below 180Hz.
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post #72 of 115 Old 07-16-14, 01:21 AM
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Re: Dolby Atmos is coming Home!

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The Atmos ceiling bounce speakers don't go below 180Hz.
Are you talking about the Pioneer speakers specifically or ALL Atmos bounce speakers?

Sanjay
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post #73 of 115 Old 07-16-14, 02:09 AM
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Re: Dolby Atmos is coming Home!

Watch/listen to the podcast at 37:45, and note how he carefully states his reply to the question, and see what you think. To me it sounds like he's meeting a Dolby spec, or he would have made it sound more like a design choice.

Clearly Dolby won't publish the specs because they're licensing Atmos to speaker manufacturers, but it seems like he leaked a bit of it there.

It makes some sense too, the up-firing driver couldn't be big because of where it has to go, and while it might not have to be a concentric driver, it will have to meet the Dolby directivity index (hopefully specified vs frequency!), but directivity below 200Hz is pretty hard to control without a big horn or an array, so it makes some sense to have it roll off below 180Hz to make the task feasible at a reasonable price point.

Perhaps you see it differently.
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post #74 of 115 Old 07-16-14, 02:27 AM
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Re: Dolby Atmos is coming Home!

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Watch/listen to [URL="http://twit.tv/show/home-theater-geeks/214"]directivity below 200Hz is pretty hard to control without a big horn or an array
But they don't need to control directivity that much since the lower frequencies you hear off-axis at the driver location won't be as localizable as the higher frequencies bouncing off the ceiling.

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post #75 of 115 Old 07-16-14, 02:40 AM
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Re: Dolby Atmos is coming Home!

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But they don't need to control directivity that much since the lower frequencies you hear off-axis at the driver location won't be as localizable as the higher frequencies bouncing off the ceiling.
Yes, they don't need to control them as much, perhaps it's a question of degree. Or perhaps the LF limit is about a balance of performance for a small driver?

I do think it's part of the Dolby Atmos reflected speaker spec.
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post #76 of 115 Old 07-16-14, 07:23 AM
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Re: Dolby Atmos is coming Home!

I was merely explaining how it was possible for a driver at ear height, pointed at the ceiling, to give the impression of sound coming from above.

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post #77 of 115 Old 07-16-14, 08:26 AM
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Re: Dolby Atmos is coming Home!

The podcast seemed to indicate that the LF limit related to practical driver size and capability. He mentioned directivity index, but didn't say what it specifically was, or if it was specified vs frequency.

I agree with you that directivity and 180Hz is less important, but it's not unimportant. How much a factor it is will depend on the difference in distance between the bounce speaker and the listener vs the reflected path length.
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post #78 of 115 Old 07-16-14, 09:10 AM
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Re: Dolby Atmos is coming Home!

"Ears on" experience with Atmos speakers:

http://www.avsforum.com/forum/90-rec...l#post25785281

Sanjay
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post #79 of 115 Old 07-16-14, 10:22 AM
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Quote:
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"Ears on" experience with Atmos speakers: http://www.avsforum.com/forum/90-rec...l#post25785281
It seems this demonstration did not include a direct comparison between 7.2 and 7.2.4 in the very same room. That is a pity, as the reviewer could not differentiate between the sound effect of the room (undoubtedly super optimized by Dolby) and what Atmos is actually doing to the 7.2 surround sound.
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post #80 of 115 Old 07-16-14, 11:27 AM
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Re: Dolby Atmos is coming Home!

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maikeldepotter wrote: View Post
It seems this demonstration did not include a direct comparison between 7.2 and 7.2.4 in the very same room. That is a pity, as the reviewer could not differentiate between the sound effect of the room (undoubtedly super optimized by Dolby) and what Atmos is actually doing to the 7.2 surround sound.
Do you mean a comparison of 2D sound (speakers around him) vs 3D sound (speakers around and above him)?

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