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Go Back   Blu-ray Forum > Audio > Audio Theory and Discussion


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Old 07-07-2008, 03:49 PM   #1
Teazle Teazle is offline
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Default Profile 3 (audio only)?

(Disclaimer: before starting this thread I did use the search function and didn't find anything useful.)

Does anyone know if the spec for BD profile 3 has been finalized? There is a mention of it on Wikipedia but no hard information. TIA.
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Old 07-07-2008, 03:54 PM   #2
aygie aygie is offline
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Quote:
Profile 3.0 is a separate audio only player profile. As of 2008-06-26, only one known Blu-ray record has been released and it has been confirmed to work on the PS3
Never heard of this and don't think it should be taken too seriously.
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Old 07-07-2008, 09:36 PM   #3
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Can't see profile 3 ever existing.

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Old 07-09-2008, 11:11 AM   #4
Teazle Teazle is offline
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Right, but is the profile finalized, i.e. does profile 3 exist on paper?

(I'm asking b/c I'm wondering whether at some point it would be worth lobbying the resident powers to include this or that feature as part of the spec, which I hope will be the successor to SACD/DVDA.)
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Old 07-09-2008, 04:24 PM   #5
allstar780 allstar780 is offline
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Quote:
Originally Posted by Teazle View Post
Right, but is the profile finalized, i.e. does profile 3 exist on paper?

(I'm asking b/c I'm wondering whether at some point it would be worth lobbying the resident powers to include this or that feature as part of the spec, which I hope will be the successor to SACD/DVDA.)
i see no reason for them to make a seperate profile for audio discs.... aside from pushing players... but realistically it could be done on 1.0 just fine.
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Old 07-09-2008, 08:49 PM   #6
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There is a reason - it could be to present super-super hires audio not possible under the normal BD limits.
32-bit 384 kHz PCM perhaps?
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Old 07-09-2008, 10:03 PM   #7
allstar780 allstar780 is offline
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ahhh touche'

would the PS3 be able to handle that? lol
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"Well surely people must write other things on the internet, what do they post after 'First'?"
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Old 07-10-2008, 01:21 AM   #8
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That depends if it's possible to bend the PS3's version of HDMI to that end. I doubt it. And they'd never allow that quality over a non-secure digital cable like USB.

Certainly the PS3 could do it via analog outs 2.0 ... not sure what quality of DAC it has though.
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Old 07-10-2008, 01:53 AM   #9
JadedRaverLA JadedRaverLA is offline
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It's important to understand that "profiles" really describe player capabilities... not discs. Although discs can have "features" (such as BonusView PIP or BD-Live internet content), the discs work in all players regardless of that player's profile. So, Profile 3.0 has nothing to do with discs that are mastered with audio only, as some kind of new format. It's just a profile that allows for BD players to be created that don't have the mandatory video outputs required by the other profiles. This would be useful for special applications like in-dash car units, etc. And, yes, it's been spec'd out (basically just profile 1.0 minus video outputs, and with some direction as to how to handle disc navigation without video), though I don't know of anyone currently working on such a player.
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Old 07-11-2008, 11:01 PM   #10
Teazle Teazle is offline
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Quote:
Originally Posted by The Guardian View Post
There is a reason - it could be to present super-super hires audio not possible under the normal BD limits.
32-bit 384 kHz PCM perhaps?
First of all, the disc would have to spin pretty fast. Even DXD (which unlike that 32-bit stuff is actually being used in mastering) is way beyond any current spec. 24 bits at 352.8 kHz, let's see, eight channels is 67.7 Mbps. BD for a/v use is limited to 48.

Wicky says that there's an audio bitrate cap of 20Mbps under current profiles. So it would take a new profile to accommodate, say, DSD-128 (also in current use). Eight channels of that are 44.8 Mbps. Wouldn't have to spin the disc any faster, but video would have to be foregone.

Funny, that's reminiscent of SACD. Take your latest DSD codec, slap it on your best disc available, devote all the bandwidth to audio and just try to sell your DSD masters.
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Old 07-11-2008, 11:17 PM   #11
Teazle Teazle is offline
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Originally Posted by JadedRaverLA View Post
So, Profile 3.0 has nothing to do with discs that are mastered with audio only, as some kind of new format. It's just a profile that allows for BD players to be created that don't have the mandatory video outputs required by the other profiles.
I have this fantasy where 3.0 players are mandated to have certain speciality audio features not required of 2.0 players, especially DSD-64 (legacy SACD) and maybe DSD-128 playback. In my fantasy there is a glorious return of hi-res audio on disc, BD-Audio replaces CD with lots of great titles to choose from, and I get the princess in the end.
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Old 07-31-2008, 07:30 AM   #12
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Quote:
Originally Posted by Teazle View Post
I have this fantasy where 3.0 players are mandated to have certain speciality audio features not required of 2.0 players, especially DSD-64 (legacy SACD) and maybe DSD-128 playback. In my fantasy there is a glorious return of hi-res audio on disc, BD-Audio replaces CD with lots of great titles to choose from, and I get the princess in the end.
I agree it should also include both DSD and DXD programs, and it should allow one to control the operations without the need for a screen, like conventional CD and SA-CD players.

2L Founder Declares Blu-ray the Future of High Quality Music Reproduction

Last edited by azure_blue; 07-31-2008 at 07:32 AM.
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