Blu-ray disc by Minakshi Molawade and Shrutika Chivhe
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Transcript of Blu-ray disc by Minakshi Molawade and Shrutika Chivhe
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Blu-ray Disc
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Contents
• Introduction• History• The Name• Format of Blu-ray disc• Structure• Types of Blu-ray Disc• Comparison between BD/DVD/CD• Characteristics• Specification• On Guard• Application• Future• Conclusion• Bibliography
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Introduction
• Blu-ray, also referred to as Blu-ray Disc (BD), is the name associated with 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.
• Although present optical disc technologies such as DVD make use of a red laser to read and write data, the Blu-ray format uses a blue-violet laser in its place.
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History
1st GENERATION:Compact disc (CD):- 650/700 MBIt is with us for over 20 years.Wavelength of laser which reads data:780 nmColor of laser: Red 2nd GENERATION:Digital versatile disc (DVD):- 4.7 GBIt offers high quality sound and video than CD.Wavelength of laser which reads data:650 nmColor of laser: Red
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History
3rd GENERATION:
Blu-ray disc (BD):-25/50 GB
-Next generation optical disc format.
-Developed by blu-ray disc association (which includes Apple, Hitachi, HP, LG, Panasonic, Pioneer, Philips, Samsung, Sharp, Sony)
-Wavelength of laser which read data:405 nm
-Color of laser: Blue-violet which was developed by SHUJI NAKAMURA
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First Thing’s First – Why The Name?
• The blu-ray name is the combination of “blue”, for color of the laser that is used and “ray” for the optical ray.
• The “e” in “blue” was purposefully left off, according to the manufacturers, because an everyday word cannot be a trademark.
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Format of Blu-ray disc
It comes in four different formats:It comes in four different formats:
1.1. BD-ROM (read only): for reading BD-ROM (read only): for reading recorded content.recorded content.
2.2. BD-R (recordable): for PC data BD-R (recordable): for PC data storage.storage.
3.3. BD-RW (rewritable): for PC data BD-RW (rewritable): for PC data storage.storage.
4.4. BD-RE (rewritable): for HDTV (high BD-RE (rewritable): for HDTV (high definition television) recording.definition television) recording.
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Structure
• Disc store digitally encoded data in PITS.
• Pits: spiral groves that runs from the center of the disc to its edge.
• Track pitch: it is the distance between the two tracks (of pits) on the surface.
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Construction
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Types of Blu-ray Disc
SINGLE LAYER :
Can hold data up to 25/27 GB that means 2 hrs of HD video or about 13 hrs of standard video.
DOUBLE LAYER :- Can hold data up to 50 GB that means
4.5 hrs of HD video or more than 20 hrs of standard video.
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Comparison between BD/DVD/CD
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Characteristics
- Lifespan- Blu-ray Disc format is designed to stay
relevant for at least 10 to 15 years.
- Cost- Blu-ray Disc production costs are within 10%
of DVD production costs, although a Blu-ray Disc offers 5-10 x the capacity.
- Capacity- The Blu-ray Disc format offers the highest
capacity of any consumer media format to date.
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Characteristics
- Robustness of Disc- The discs offer much stronger resistance to
scratches and fingerprints than other existing and proposed formats.
- Compatible- The BD drives are designed to be backward
compatible, i.e. CDs and DVDs work equally well with the BD drives.
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Specification
Capacity 23.3 25 27GB (single layer)
Wave length of the laser 405nm
Numerical Aperture of the objective lens
0.85
Data transfer rate 36Mbps
Thickness of the disc 1.2mm
Diameter of the center hole 15mm
Recording method Phase change
Data track Groove recording
Visual data MPEG-2 video
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On Guard
• Blu-ray discs are better armed than current DVD’s. They come equipped with a secure encryption system – a unique ID that protected against video piracy and copyright infringement.
• Disc is mandatory and will be governed by strict licensing procedures.
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Application
- High Definition Television Recording
- High Definition broadcasting is vastly expanding in the U.S. and Asia.
- High Definition Video Distribution- Due to its enormous data capacity of 25 to 50
GB per (single-sided) disc, the Blu-ray Disc format can store High Definition video in the highest possible quality.
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Application
- High Definition Camcorder Archiving
- As the market penetration of High Definition TV sets continues to grow, so does the demand of consumers to create their own HD recordings.
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Application
- Mass Data Storage- The Blu-ray Disc format again offers 5-
10 x as much capacity as traditional DVD resulting in 25 to 50 GB of data to be stored on a single rewritable or recordable disc.
- Digital Asset Management and Professional Storage
- Due to its high capacity, low cost per GB and extremely versatile ways of transferring data from one device to another
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Future
• Current developments by Pioneer have pushed the storage potential to 500GB on a solitary disc by using 20 layers.
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Bibliography
• www.digitaljournal.com• www.blu-ray.com• www.docstoc.com• allfreedownloadlinks.com• reviews.cnet.com• en.wikipedia.org• www.thefreelibrary.com
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Thank you..!