Blu Ray Disc

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Blu-ray Disc

ByMiss . Apurva P. Patil (M.Tech Electronics)K.B.P. college of engineering, Satara.

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Contents1) History2) Format & Types Of BD3) Basics of Data Storage4) Recording and Playback Techniques

Track Form Block diagram of Blu-ray Disc drive Limit-Equalizer Schematic form of a digital storage system

5) Comparison of CD,DVD and BD6) Features Of BD7) Characteristics Of Blu-ray8) Blu-ray Disc Applications9) Conclusion

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History 1st GENERATION:Compact disc (CD): --- 650/700 MBIt is with us for over 20 years.Wavelength of laser : 780 nmColor of laser: Red 2nd GENERATION:Digital versatile disc (DVD): - 4.7 GBhigh quality sound and video than CD.Wavelength of laser : 650 nmColor of laser: Red

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3 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 : 405 nm-Color of laser: Blue-violet which was developed by

Mr. SHUJI NAKAMURA

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History

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Format & Types Of BD

BD-ROM BD-R BD-RW BD-RE: for HDTV

SINGLE LAYER :-Layer thickness=100 m-25/27 GB data (2 hrs of HD video or

13 hrs of standard video) DOUBLE LAYER :-Layer thickness Front Layer(L1)=75 m Rear Layer(L0)=100 m-50/54 GB data (4.5 hrs of HD video

or 20 hrs of standard video)

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Basics of Data Storage

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Recording and Playback Techniques

Track Format

Outline of Groove geometry

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Recording Pits on Organic Dye-Based Optical Disc

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Recording and Playback Techniques

Disc structure

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Partial Response Maximum Likelihood (PRML)

Recording and PlaybackTechniques

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SNR improvement by high frequency boost

Improve SNR Suppress ISI

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Configuration of the Limit-Equalizer

K=coefficient of gainD= unit duly

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-k x(b)+k x(c)+k x(d)-k x(e) 0 -k x(f)+k x(f)+k x(-f)-k x(-f)= 0

Playback signal waveform is symmetrical (solid line) -k x(a)+k x(a)+k x(-a)-k x(-a)=0Playback signal waveform is an asymmetrical -k x(b)+k x(c)+k x(d)-k x(e) 0After limiter waveform become symmetrical -k x(f)+k x(f)+k x(-f)-k x(-f)= 0

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Eye diagrams after the Linear Equalizer & the Limit-Equalizer

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Schematic form of a digital storage system

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Coding for BD optical recording

•RLL- Run Length Limit

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2.11 m 1.32 m 0.58 m

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Comparison of CD,DVD and BD specification Parameter CD DVD BD Disk diameter 120 mm 120 mm 120 mm Disk thickness 1.2 mm 1.2 mm 1.2 mm Laser wavelength 780 nm 650 nm 405 nm Numerical aperture 0.45 0.60 0.85 Minimum pit length 0.83 um 0.4 um 0.138

um Data rate 1.2 Mb/sec 11 Mb/sec 36 Mb/sec

Number of data layers One One or two One or two Data capacity ~680 MB 4.7 GB 25-27 GB

8.5 GB 50-54GB

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Features of BD

With BD we can:Record HDTV without any quality lossInstantly skip to any spot on discRecord one program while watching other on the discCreate playlistsEdit or reorder programs recorded on discAutomatically search for an empty space on the disc to avoid recording over a programAccess to web to download subtitles and other extra features

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Characteristics of Blu-ray disc Life Span Content Protection Capacity Cost Robustness of disc Compatible

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Blu-ray Disc Applications High definition television recording High definition video distribution High definition camcorder archiving Mass data storage

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Conclusion

3rd generation disc which has high storage capacity. More life-span due to the protecting layer.Very soon BD replaces CD’s & DVD’s.

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References

1. White Paper, Blu-ray Disc™ Format, A Physical Format Specifications for BD-RE,3rd Edition ,October, 2010.

2. White Paper,Blu-ray Disc™ Format ,1. B Physical Format Specifications for BD-R,5th Edition, October, 2010.

3. Multimedia Archiving: Videotape, Compact Disc(CD), Digital versatile disc (DVD), &Blu -ray Disc (BD) media, Secretariat Range Commanders Council U.S. Army White Sands Missile Range New Mexico 88002-5110

4. “Effects of Limit Equalizer in Blu-ray Disc Format “ Hideki Kobayashi, Hiroki Kuribayashi, Yoshimi Tomita and

Seiichi Ohsawa

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THANK

YOU !!!