03-03-2011, 11:01 AM
[attachment=9421]
INTRODUCTION
Blu-ray (BD) is a next-generation optical disc format.
The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data.
The companies that have jointly established the BD specifications are
Hitachi, Ltd
LG Electronics
Matsushitha Electrical Industrial Co. Ltd
Mitsubishi Electric Corporarion
Pioneer Corporation
Samsung Electronics Co. Ltd
Sony
Thomson
Royal Phillips Electronics
Sharp Corporation
The name Blu-ray is derived from the blue-violet laser it uses to read and write to the disc.
The “e” was intentionally left out of the name due to trademark restrictions
Discs store digitally encoded video and audio information in pits.
A laser reads the other side of these pits -- the bumps -- to play the movie or program that is stored on the DVD.
The more data that is contained on a disc, the smaller and more closely packed the pits must be.
The smaller the pits (and therefore the bumps), the more precise the reading laser must be.
Blu-ray also has a higher data transfer rate -- 36 M
HOW IT WORKS?????
CHARACTERISTICS OF BLU-RAY
Life Span
Content Protection
Cost
Capacity
Robustness of disc
Compatible
Life Span
In the case of ordinary discs, the disc life is less .
In the rewritable versions, as re-writing is done repeatedly to one area of the disc most probably, the inner perimeter limiting the disc life.
BDFS (Blu-ray Disc File Structure is designed so as to avoid this problem, by using a system that uses free disc spaces with equal frequency)
Capacity
The Blu-ray disc enables the recording, rewriting and playback of HD video up to 27 GB of data on a single sided single layer. It is enough to put 2.5 hours of HDTV recording on it. It also can record over 13 hours of standard TV broadcasting
Security
– Blu-ray discs are better armed than current DVDs. They come equipped with a secure encryption system -- a unique ID that protects against video piracy and copyright infringement.
Robustness of Disc
Stronger resistance to scratches and fingerprints. The protective layer is hard enough to prevent accidental abrasions and allows fingerprints to be removed by wiping the disc with a tissue.
Principal BD Specifications
• Comparison of CD,DVD and B D specification
Blu-ray disc and CD’s /DVD’s
1 DVD = 5 to 10 CD’s
1 Blu-ray = 5 to 10 DVD’s !!!!!!
Usage of a blue instead of a red laser
Improved lens specifications
Backward compatibility
Blu-ray Disc Applications
High definition television recording
High definition video distribution
High definition camcorder archiving
Mass data storage
High Definition
• To better understand the need for media formats with greater storage lets briefly describe what High Definition is.
• Your regular TV signal has about 480 pixel lines, but HD has about 1280 pixel lines that go across your TV
• Because of this difference the bandwidth of HD is about 5 times greater than standard video.
• Currently a standard movie takes up almost an entire DVD so we need something that’s almost 5 times that.
PIXEL: The pixel is the smallest addressable screen element; it is the smallest unit of picture that can be controlled. Each pixel has its own address and are often represented using dots or square
High definition television recording
The Blu-ray Disc format offers consumers the ability to record their High Definition television broadcasts in their original quality for the first time, preserving the pure picture and audio level as offered by the broadcaster.
Next level in home entertainment, offering an unsurpassed user experience Since Blu-ray Disc format incorporates the strongest copy protection algorithms of any format or proposal to date, the format allows for recording of digital broadcasts while meeting the content protection demands of the broadcast industry.
High Definition Video Distribution
Blu-ray Disc format can store High Definition video in the highest possible quality, without need to compromise on picture quality.
Depending on the encoding method, there is room for more than seven hours of the highest HD quality video. There is even room for additional content such as special features and other bonus material to accompany the High Definition movie.
The Blu-ray Disc movie format greatly expands on traditional DVD capabilities, by incorporating many new interactive features allowing content providers to offer an even more incredible experience to consumers.
High Definition Camcorder Archiving
With its unprecedented storage capacity, allows for the HD video recorded with an HD camcorder to be converted and recorded
Storage capabilities, without the risk of tape
Mass Data Storage
The growing number of broadband connections allowing consumers to download vast amounts of data
• Criticisms of Blu-rays
Conclusion
Very soon BD’s will replace CDs and DVDs