blu ray presentation

8/3/2019 Blu Ray Presentation

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Dept. of Electronics and Communication

Prepared By:AnkurShrivastava


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HistoryHistory

1 s t G E N E R A T I O N :Compact disc (CD): ---650/700 MB

It is with us for over 20 years.Wavelength of laser whichreads data: 780 nmColor of laser: Red2 n d GENERAT ION :Digital versatile disc (DVD): ---4.7 GBIt offers high quality soundand video than CD.Wavelength of laser which


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HISTORY.HISTORY.

3 rdd G E N E R A T I O NE N E R A T I O N :Blu-ray disc (BD)Blu-ray disc (BD): --- 25/50 GB: --- 25/50 GB

Next generation optical disc formatNext generation optical disc format..Blu-ray disc (BD) uses blue-voilet laser to read and writethe data..The first blue laser was

developed in 1996 by ShujiNakamura (Nichia Corporation),professor at the university ofcalifornia..Because Blu-ray uses blue laser(405nm wavelenght) instead of
http://en.wikipedia.org/wiki/Image:Blu-ray_200GB.png


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CHARACTERISTICS OFCHARACTERISTICS OF

BLU-RAYBLU-RAY Life SpanLife Span Content ProtectionContent Protection

CostCost CapacityCapacity Robustness of discRobustness of disc

CompatibleCompatible


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Life SpanLife Span

In the case of ordinary discs, the discIn the case of ordinary discs, the disc

life islife is lessless ..

In the rewritable versions, as re-In the rewritable versions, as re-writing is done repeatedly to onewriting is done repeatedly to one

area of the disc most probably, thearea of the disc most probably, the

inner perimeterinner perimeter limiting the disc life.limiting the disc life. BDFS (Blu-ray Disc File Structure isBDFS (Blu-ray Disc File Structure is

designed so as to avoid this problem,designed so as to avoid this problem,

by using a system thatby using a system that uses free discuses free disc


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Content ProtectionContent Protection

Strongest content andStrongest content and copycopy

protectionprotection schemes ever developedschemes ever developed

Cost

Long term Profitability model for contentProvidersCheapest Production cost


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CapacityCapacity

The Blu-ray disc enables theThe Blu-ray disc enables the

recording, rewriting and playbackrecording, rewriting and playback ofof

HD video up toHD video up to 27 GB27 GB of data on aof data on asingle sided single layer. It is enoughsingle sided single layer. It is enough

to put 2.5 hours of HDTV recordingto put 2.5 hours of HDTV recording

on it. It also can record over 13 hourson it. It also can record over 13 hoursof standard TV broadcastingof standard TV broadcasting


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Robustness of DiscRobustness of Disc

Stronger resistance toStronger resistance to scratchesscratches andand

fingerprints The protective layer isfingerprints The protective layer is

hard enough to prevent accidentalhard enough to prevent accidentalabrasionsabrasions and allows fingerprints toand allows fingerprints to

be removed by wiping the disc withbe removed by wiping the disc with aa

tissue.tissue.CompatibleThe BD drives are designed to bebackward

compatible, i.e. CDs and DVDs work


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DiscDiscCharacteristicsCharacteristics

Blu-ray can be a multi layer (single,double n soBlu-ray can be a multi layer (single,double n so

on) andon) and dependdepend on layer it stores data .on layer it stores data .

MoreMore is theis the layerlayer more is the capability of storingmore is the capability of storing

data .data .

Single layerSingle layer disc can holddisc can hold 25GB25GB ..

Double layerDouble layer disc can holddisc can hold 50GB50GB ..

To ensure that blu-ray discTo ensure that blu-ray disc format is easilyformat is easilyextendableextendable (future proof) it includes support for(future proof) it includes support for

multi-layer disc,which allows the storagemulti-layer disc,which allows the storage

capacity to be increased to 100-200GB(25GB percapacity to be increased to 100-200GB(25GB per

layer) in future simply by adding more layers.layer) in future simply by adding more layers.


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THE TECHNOLOGYTHE TECHNOLOGYPitsPits : spiral grooves that: spiral grooves that

run from the centre ofrun from the centre ofthe disc to its edgesthe disc to its edges

BumpsBumps : other sides of: other sides ofthese edges.these edges.Track pitchTrack pitch : it is the: it is the

distance between thedistance between thetwo tracks (of pits) ontwo tracks (of pits) on

the surface.the surface.----------------------------------------------------------------

Disc store digitally encodedDisc store digitally encodeddata in PITS.data in PITS.

----------------------------------------------------------------


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THE TECHNOLOGYTHE TECHNOLOGY

In blu-ray disc:In blu-ray disc:

Pit sizePit size 0.15 0.15 micronsmicrons( more than twice as( more than twice as

small as the pits on DVDsmall as the pits on DVD))

Track-pitch isTrack-pitch is : 0.32: 0.32

micronsmicrons

Laser neededLaser needed :: blue-blue-violet laser (405 nm)violet laser (405 nm)

Data transfer rateData transfer rate : 36: 36

MbpsMbps


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HOW BLU RAY DISC MAKEOW BLU RAY DISC MAKEHOW THEY READ DATAOW THEY READ DATA


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COMPARISON INCOMPARISON IN

BUILDING BD AND DVDBUILDING BD AND DVDBDBD

Data is placed on top of a 1.1Data is placed on top of a 1.1

mm thick polycarbonate layermm thick polycarbonate layer

Doesnt suffer fromDoesnt suffer fromB I R E F R I N G E N C EI R E F R I N G E N C E

Doesnt suffer fromDoesnt suffer fromD I S CIS C

T I LTI LT Hard coating is placed outsideHard coating is placed outside

to protect from scratches orto protect from scratches orfingerprintsfingerprints

DVDDVD Data is sandwiched b/w twoData is sandwiched b/w two

polycarbonate layers, each 0.6polycarbonate layers, each 0.6mm thickmm thick

Suffer fromSuffer from B I R E F R I N G E N C EI R E F R I N G E N C E

Suffer fromSuffer fromD I S C T I L TI SC T I LT

No such hard coating is placedNo such hard coating is placed


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COMPARISON(CONTD)OMPARISON(CONTD)


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Capacity Comparisonapacity Comparison


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Blu-Ray Disc

ApplicationsHigh definition televisionrecordingHigh definition videodistribution

High Definition CamcorderArchivingMass DataStorage


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BLU RAY SBLU RAY SADVANTAGESADVANTAGES Various hard coating technologies make Blu ray disc most durable

and family -friendly

Hard-coating technology provides resistance to:

- Finger prints

- Marks

- Scratches

- Dust

Much more ROBUST than todays polycarbonate-based CD/DVDs

(and HD DVDs). Strongest content and copy protection schemes

ever developed. Incorporation of Robust copy mechanism.


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BLU RAY SBLU RAY SADVANTAGESADVANTAGESThe 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 hoursof standard TV broadcasting.

Create playlists.

Higher density enables better data seek times.Shorter to travelfor same amount of data results in faster data

seek.Better for random access of data


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Conclusion

Very soon BDs will replace CDs andDVDs

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