blue ray and hd
TRANSCRIPT
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Blu-ray and HD
DVD Technologies
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Main Topics
Current Media Format
Theory of Blu-ray Technology
Integration of Blu-rayTheory of HD DVD Technology
Integration of HD DVD
Comparison - Which is better? Which oneis more likely to catch on?
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Evolution
Courtesy Blu-ray Disc Founders Blu-ray Disc Format White Paper
VHS: analog
DVD: digital
BD: high-definition
Enables recording,
rewriting, andplayback of high-
definition video
Capable of storing
information thatthe DVD and CD
are not capable of
holding
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Current Media Format
CDs Consist of pits and
lands stamped out in aspiral pattern on thedisc.
A laser then reads thepits and lands.
The change from a pit
to a land or a land to apit indicates a onewhile no changeindicates a zero.
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Current Media Format Cont.
CD-RWs Consist of a metal
phase change alloywhich when heatedcan be to change toreflectivity
CD-Rs Consist of a dye that is
applied to the disc. When a writing laser is
shined it changes thereflectivity.
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Current Media Format Cont.
DVDs
Also contain pits and
lands.
Are more highlycompact than a CD.
Special laser is
needed to read them.
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High Definition
To better understand theneed for media formatswith greater storage letsbriefly describe what High
Definition is. Your regular TV signal
has about 480 pixel lines,but HD has about 1280pixel lines that go across
your TV
Because of this differencethe bandwidth of HD isabout 5 times greaterthan standard video.
Currently a standardmovie takes up almost anentire DVD so we needsomething thats almost 5times that.
Enter Blu-ray and HDDVD technologies.
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Blu-ray Technology
Name
Derived from the blue-
violet laser used toread and write data.
Developed by the Blu-ray Disc Associationwith more than 180
members. Dell
Sony
LG
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Blu-ray Technology Cont.
Data capacity Because Blu-ray uses
a blue laser(405nanometers) insteadof a red laser(650nanometers) thisallows the data trackson the disc to be verycompact.
This allows for morethan twice as smallpits as on a DVD.
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Blu-ray Technology Cont.
Data Capacity Cont.
Because of the greatlycompact data Blu-ray can holdalmost 5 times more data thana single layer DVD. Close to
25 GB! Just like a DVD Blu-ray can
also be recorded in Dual-Layer format. This allows thedisk to hold up to 50 GB!!
Because the polycarbonate
layer of the Blu-ray disc is somuch larger than a DVDbecause the recording layer isso much smaller it can haveeven more than two layers.
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Blu-ray Technology Cont.
Writing Data Blu-ray uses a
combination of twolenses to greatlyshrink the laser to readthe data.
This also allows forhigher data rate
transfer close to 36mbps. It could record 25 GB of
data in an hour an ahalf.
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Blu-ray Technology Cont.
BD-ROM (read-only) - for pre-recorded
content
BD-R (recordable) - for PC data storage
BD-RW (rewritable) - for PC data
storage
BD-RE (rewritable) - for HDTV recording
Formats
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Blu-ray Integration
Blu-ray discs are able
to record HD without
any signal loss.
Single layer up to 2hours of HD video
Dual layer up to 4.5
hours of HD video
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Blu-ray Integration Cont.
Security
Blu-ray discs are
better armed than
current DVDs. Theycome equipped with a
secure encryption
system -- a unique ID
that protects against
video piracy andcopyright infringement.
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HD DVD Technology
Name
Obviously comes from
the term High
Definition Developed by Toshiba
and NEC
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HD DVD Technology Cont.
Data Capacity
HD DVD uses close to
the same blue laser
that the Blu-ray discdoes. It is also 405
nanometers wide.
Thus allows for data to
be greatly
compressed.
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HD DVD Technology Cont.
Data Capacity Cont.
Single Layer Disc
15 GB
Dual Layer Disc
30 GB
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HD DVD Technology Cont.
HD DVD (read-only) - for pre-recordedcontent
HD DVD-R (recordable) - for PC data
storage HD DVD-RAM (rewritable) - for HDTV
recording
Formats
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HD DVD Integration
Compatibility
Because a lot of
home-users dont yet
have a high definitionTelevision the makers
of the HD DVD disc
made it backwards
compatible by using
the twin formatscheme.
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HD DVD Integration Cont.
Compatibility Cont.
But what about dual
layer??
In order toaccommodate for theneeds of the storage
capacity of the duallayer format themakers designed thecombination format.
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HD DVD Integration Cont.
Security
Uses the same security
feature as Blu-ray.
Both Blu-ray and HD DVD
makers said would beextremely hard to pirate
with this security feature.
Eight days after HD DVD
discs hit the market a
hacker called muslix64reportedly cracked the
security feature.
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HD DVD vs Blu-ray
Both have the same options forvideo and audio compression.
Blu-ray offers significantly more storage space -- 50 GB on a dual-layer disc versus HD-DVD's 30 GB.
The DVD Forum, which creates DVD standards, has approved HD-DVD and has not approved Blu-ray.
HD-DVD is less expensive than Blu-ray.
HD-DVDs can be produced on existing equipment, and Blu-raydiscs can't.
HD-DVD players hit the market on April 18, 2006, two months beforethe first Blu-ray player hit the U.S. market in June, 2006.
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HD DVD vs Blu-ray Cont.
Current supporters of HD-DVD include Toshiba, NEC, Sanyo,and Microsoft, in addition to New Line Cinema, Paramount,Universal, Time-Warner, and the official approval of the DVDForum.
Current supporters for Blu-Ray includes PC makers Apple,Dell, Hewlett-Packard, and Sony, and electronics giantsHitachi, LG, Mitsubishi Electric, Matsushita/Panasonic,Pioneer, Philips, Samsung, Sharp, TDK, and Thomson. Addto this the support by movie studios such as Columbia TriStar,Sony Pictures and MGM (all three owned by Sony), 20th
Century Fox, Lions Gate Entertainment, and Disney, as wellas video game makers Electronic Arts and Vivendi UniversalGames, and the bastion of support for Blu-Ray looksformidable indeed
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WAR!!
In summary it is hard to tell which mediaformat will win this format war.
It all depends on which format consumerscan get more cheaply, more quickly, with
more movies available for it. Blu-Ray istechnologically superior
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