Post on 10-Apr-2018
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Blu-ray Disc
March 7, 2005
James Huguenin-Love
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Evolution
Courtesy Blu-ray Disc Founders Blu-ray Disc Format White Paper
VHS: analogDVD: digitalBD: high-definition
Enables recording,
rewriting, andplayback of high-definition video
Capable of storing
information thatthe DVD and CDare not capable ofholding
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Foundation
Blu-ray disc (BD) is appropriately named afterthe blue laser used to write the data
The first blue laser was developed in 1996 by
Shuji Nakamura (Nichia Corporation) In 2002, an alliance was formed, called the
Blu-ray Disc Association, including the likesof Sony, Samsung, Sharp, Hewlett-Packard,
and Royal Phillips The e is intentionally left out of the name
due to trademark restrictions
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Disc Characteristics
Courtesy Blu-ray Disc Founders Blu-ray Disc Format White Paper
The powerconservationallows thedevelopment ofmulti-layer
platforms andhigh-speedrecording
BD-ROM: read-only format
BD-R and BD-RE:recordable formats(RE: rewritable; R:recordable once)
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Disc Characteristics
Courtesy Blu-ray Disc Founders Blu-ray Disc Format White Paper
Numerical Aperature measures the ability of a lens togather and focus light. As the numerical aperture
increases, the focusing power increases and the beamsize decreases Phase change implies that the disc section is either an
amorphous or crystalline state. The reflectivity changesaccordingly thus representing a binary bit
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Recorder Characteristics
Over two hours of HDTV can be placed on asingle layer BD, which correlates to over 13hours for standard TV
The transfer rate is 36 megabits per second
At 1x speed, it takes approximately 1.5 hoursto record an entire single layer BD
Recorder Cost: $1,500 - $2,500; BD Cost:$26
Expected to be available in the U.S. by 2006
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Compatibility
Courtesy
This issue has introduced a competitor, the HD-DVD, that based itstechnology around being compatible with the DVD
Recently the BDA has developed recorders that are BD/DVD/CDcompatible
JVC has advanced the BD by developing a BD/DVD combo disc that
stores both DVD and BD data. It is composed of two DVD layers and athird BD layer storing 33.5 GB total
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Protection System
HDTV contains a copyright bit that isdetected by the BD recorder. If the broadcasthas no copyright bit, then the BD recorder isallowed to store the information
Uses the Data Encryption Standard (DES)that has a key length of 56 bits
A Key Block and Disc ID are written into theROM area to prevent illegal copying
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Enhancements
Courtesy Blu-ray Disc Founders Blu-ray Disc Format White Paper
Error rates increased in reading and writing after theoriginal BD suffered scratches and fingerprints
For protection, the prototype BD was enclosed in a case
The case increased the size of the disc drive
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Enhancements
Courtesy Blu-ray Disc Founders Blu-ray Disc Format White Paper
A hard coat wasderived of anultraviolet-curableresin that has a
scratch resistancesimilar to the DVD
An artificialfingerprint reagentis placed on thedisc surface toresist fingerprintoils
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Future
Expect the BD to become more prevalentonce the HDTV market establishes itspresence
Audio and video will reach higher qualitieswith larger storage space
Look for BD with more than two layers as the
technology is further refined