Sony Corp. and Panasonic Corp. reportedly want to ratify extensions to Blu-ray disc standard with the Blu-ray disc Association that would enable further capacity increase for the type of media. If the key developers of Blu-ray technology succeed in standardizing their recent achievements, then it will be possible to make dual-layer BD mediums with up to 66.8GB capacity.
Read and write at 33.4GB per layer would be implemented by utilizing partial response maximum likelihood (PRML) signal processing, reports Tech-On web-site. PRML assumes inter-symbol interference, which makes it difficult to base optical disc quality evaluation on jitter, as is widely done now for Blu-ray and other optical discs. The new method can continue to use the existing Blu-ray optics: a blue-violet laser diode with a 405nm wavelength, and an object lens with a numeric aperture (NA) of 0.85.
“At high-density recording, such as 33.4GB [per layer], the relationship between the error rate and jitter collapses, and it becomes extremely difficult to evaluate jitter. i-MLSE (Maximum Likelihood Sequence Estimation) exhibits the same relationship to signal quality as conventional jitter,” a source from Sony is reported to have said.
Unfortunately, i-MLSE calculation is very complex and Sony hopes that only recent or forthcoming hardware can calculate it in real time, hence, existing Blu-ray players and drives may be incompatible with the forthcoming BD media.
Sony plans to propose widespread adoption of i-MLSE via the BDA.
Last year the BDA said officially that existing Blu-ray disc players would not be compatible with 100GB or 200GB BD media. Nevertheless, BDA indicated that 50GB should be enough for movies for many years to come.
“I think there will be applications for larger capacity recordable discs, but it would be difficult for [discs larger than 50GB] to achieve compatibility with the installed base of players. This is because player manufacturers design players to meet published specifications that define maximum media capacity, which in the case of Blu-ray Disc, is 50GB on two-layer media,” said Andy Parsons, the chairman BDA’s promotion committee in the U.S., in an interview.
Tags: Blu-ray, Sony, Panasonic
Comments currently: 2
Discussion started: 01/05/10 07:10:49 AM
Latest comment: 01/05/10 12:50:12 PM
Why is Sony constantly trying to shoot itself in the foot?
They just don't get it. People want stability and compatibility in their media formats. How many changes to the DVD format occured over the years? Exactly zero. And what do you know, it's still outselling Blu-Ray, still holds a 480p movie and extras, and still plays in my 10 year old DVD player.
If Sony renders my newly purchased, and expensive, Blu-Ray player obsolete, I won't be happy, and not very likely to "upgrade" anytime soon.
Sony is the king of proprietary formats, closed systems, and questionable design decisions. Their philosphy is "our way or the highway". I honestly believe that the corporate executives at Sony live in a dream world, similar to Michael Jackson, where everyone loves them and everything they do is wonderful.
Buying off the movie companies in order to defeat the DVD-HD format got them the "win" they so despirately wanted. But now that they're the only HD game in town, they're trying to force their idiotic Sony vision onto the world. Sony needs to remember that outside of their diehard fans, there aren't a lot of us willing to kneel down and kiss the royal Sony ring and pay dearly for the priveledge.
How about this? Instead of changing disc capacities and formats, why don't you concentrate on market penetration, design improvment, cost reduction to the existing media and hardware, and integration into more applications, like car audio and computers (right now Blu-Ray players in computers are a joke). Wow, what a concept that would be.
01/05/10 07:10:49 AM]
While I understand your remarks, I don't agree with them.
DVD did change, of course, that's why we have Blu-Ray and had HD-DVD. Whether they call it something else or not doesn't really matter, it's just that the technology keeps advancing, and that's normal.
I don't think it will make your existing system obsolete, in that it will still be able to do what it always has, and it's clear that the base Blu-Ray format will probably remain the most popular for quite some time, simply because that's where the installed base is. A lot of people struggled to see the quality difference between the HD formats and DVD, so the advantage of a newer Blu-Ray will be much less.
If you consider the time involved to get these things out, and then the fact they should be a lot more expensive considering the technology they need, the base Blu-Ray will have a huge installed base before these things usurp them in sales. Even then, movie companies will still have to cater to the large installed base of old Blu-Ray players. Eventually, very far from now, they might make just the newer format, but by then, your existing one might be broken, or at any rate, quite old.
01/05/10 12:50:12 PM]
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