blue ray and hd

8/8/2019 blue ray and hd

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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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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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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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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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Data Capacity Cont.

Single Layer Disc

15 GB

Dual Layer Disc

30 GB


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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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