29-05-2012, 12:16 PM
Blu-ray Disc
BLUERAY DVD.pdf (Size: 292.98 KB / Downloads: 46)
Introduction
Tokyo Japan, February 19, 2002: Nine leading companies today
announced that they have jointly established the basic specifications for a next
generation large capacity optical disc video recording format called "Blu-ray
Disc". The Blu-ray Disc enables the recording, rewriting and play back of up to
27 gigabytes (GB) of data on a single sided single layer 12cm CD/DVD size disc
using a 405nm blue-violet laser.
By employing a short wavelength blue violet laser, the Blu-ray Disc
successfully minimizes its beam spot size by making the numerical aperture
(NA) on a field lens that converges the laser 0.85. In addition, by using a disc
structure with a 0.1mm optical transmittance protection layer, the Blu-ray Disc
diminishes aberration caused by disc tilt. This also allows for disc better readout
and an increased recording density. The Blu-ray Disc's tracking pitch is reduced
to 0.32um, almost half of that of a regular DVD, achieving up to 27 GB highdensity
recording on a single sided disc.
Because the Blu-ray Disc utilizes global standard "MPEG-2 Transport
Stream" compression technology highly compatible with digital broadcasting for
video recording, a wide range of content can be recorded. It is possible for the
Blu-ray Disc to record digital high definition broadcasting while maintaining
high quality and other data simultaneously with video data if they are received
together. In addition, the adoption of a unique ID written on a Blu-ray Disc
realizes high quality copyright protection functions.
The Blu-ray Disc is a technology platform that can store sound and video
while maintaining high quality and also access the stored content in an easy-to101seminartopics.
com
use way. This will be important in the coming broadband era as content
distribution becomes increasingly diversified. The nine companies involved in
the announcement will respectively develop products that take full advantage of
Blu-ray Disc's large capacity and high-speed data transfer rate. They are also
aiming to further enhance the appeal of the new format through developing a
larger capacity, such as over 30GB on a single sided single layer disc and over
50GB on a single sided double layer disc. Adoption of the Blu-ray Disc in a
variety of applications including PC data storage and high definition video
software is being considered.
Concept of the format establishment :
To realize the large capacity with 12cm disc
- More than 2-hour high definition video recording
- High capacity of more than 4-hour recording by double layer
technology.
To cope with digital broadcasting
- High compatibility with digital broadcasting
- To prevent illegitimate duplication of contents
To enhance the Blu-ray Disc world
- Adoption of the Blu-ray Disc in variety of media and applications
Main Features of physical format:
Large recording capacity up to 27GB:
By adopting a 405nm blue-violet semiconductor laser, with a 0.85NA
field lens and a 0.1mm optical transmittance protection disc layer structure, it
101seminartopics.com
can record up to 27GB video data on a single sided 12cm phase change disc. It
can record over 2 hours of digital high definition video and more than 13 hours
of standard TV broadcasting (VHS/standard definition picture quality, 3.8Mbps)
Easy to use disc cartridge:
An easy to use optical disc cartridge protects the optical disc's recording
and playback phase from dust and fingerprints
High-speed data transfer rate 36Mbps:
It is possible for the Blu-ray Disc to record digital high definition
broadcasts or high definition images from a digital video camera while
maintaining the original picture quality. In addition, by fully utilizing an optical
disc's random accessing functions, it is possible to easily edit video data captured
on a video camera or play back pre-recorded video on the disc while
simultaneously recording images being broadcast on TV.