21-03-2011, 04:06 PM
blu-ray DISC.ppt (Size: 245 KB / Downloads: 87)
BLU –RAY DISC
The “Blu-Ray Disc association” was found in 2002 by nine leading electronic companies.
Blu-ray disc is the next generation optical disc format.
BD uses a blue-violet laser operating at a wavelength of 405 nm, to read and write.
A single layer Blu-Ray Disc can store 25GB. In dual layer can store 50GB.
In fact ,7 0f 8 movie studios are supporting the Blu-ray format and 5 of them are releasing their movies in Blu-ray disc.
FASTNESS IN READ/WRITE ON A BD
BD-ROM movies will require a 54Mbps data transfer rate the minimum speed were expecting to see is 2x.
The large NA (numerical aperture) value effectively means that Blu-ray will require less recording power and lower disc rotation speed than DVD and HD-DVD.
Blu-ray disc association (BDA) already has plans to raise the speed to 8x(288Mbps) or more in the future.
CODECS IN BLU-RAY DISC
Codecs are compression schemes
Reduces the data storage requirements
video codecs are required to support:
MPEG-2
H.264/AVC
SMPTE VC-1
Audio codecs are required to support:
Dolby Digital AC-3
DTS
linear PCM
DIGITAL RIGHT MANAGEMENT
The Blu-ray disc format employs several layers of DRM.
BD+ is a small virtual machine embedded in authorized players.
It allows content providers to include executable programs on Blu-ray Discs.
BD-ROM mark is a small amount of cryptographical data that is stored physically different from normal blu-ray data.
HARD-COATING TECHNOLOGY
Blu-ray discs use a layer of protective material on the surface through which the data is read.
The introduction of polymer coating in blu-ray discs substantial scratch resistance.
Verbatim recordable and rewritable blu-ray discs use their own proprietary hard-coat technology called ScratchGuard.
COMPATIBILITY
Blu-ray disc drives should be capable of reading standard DVDs for backward compatibility.
Blu-ray disc players released support DVD playback as well, however not all support CD playback.
BLU-RAY DISC COMPARISON WITH HD DVD, AND DVD
Laser wavelength
Storage capacity
Numerical aperture
Maximum bit rate
Video resolution (maximum)
Internet support
Secondary video decoder
Secondary audio decoder
Audio codecs
Video codecs
APPLICATIONS
High definition Television Recording
High definition video distribution
High definition Camcorder Archiving
BLU-RAY DISC DEVELOPMENT
Quad-layer(100 GB) discs have been demonstrated on a drive with modified optics.
JVC has developed a three layer technology that allows putting both standard-definition DVD data and HD data on a BD/DVD combo.
CONCLUSION
Thus the blu-ray disc provides greater video, audio quality, and special features.
The advanced interactivity combined with the networking features of blu-ray will also allow content producers to support new innovative features such as downloading extras, updating content via the web, and watching live broadcasts of special features.