Blu Ray Disc

Blu-ray Disc
By
Miss . Apurva P. Patil (M.Tech Electronics)
K.B.P. college of engineering, Satara.
1

Contents
1) History
2) Format & Types Of BD
3) Basics of Data Storage
4) 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 BD
6) Features Of BD
7) Characteristics Of Blu-ray
8) Blu-ray Disc Applications
9) Conclusion
2

History
 1st GENERATION:
Compact disc (CD): --- 650/
700 MB
It is with us for over 20 years.
Wavelength of laser : 780 nm
Color of laser: Red
 2nd GENERATION:
Digital versatile disc (DVD): -
4.7 GB
high quality sound and video
than CD.
Wavelength of laser : 650 nm
Color of laser: Red
3

 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
rd
History
4

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)



5

Recording and Playback Techniques
Track Format
Outline of Groove geometry
7

Recording Pits on Organic Dye-
Based Optical Disc
8

Recording and Playback Techniques
Disc structure
9

Partial Response Maximum Likelihood (PRML)
Recording and Playback
Techniques
10

SNR improvement by high frequency
boost
 Improve SNR
 Suppress ISI
11

Configuration of the Limit-Equalizer
K=coefficient of gain
D= unit duly
12

-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)=0
Playback signal waveform is an asymmetrical
-k x(b)+k x(c)+k x(d)-k x(e) 0
After limiter waveform become symmetrical
-k x(f)+k x(f)+k x(-f)-k x(-f)= 0

13

Eye diagrams after the Linear
Equalizer & the Limit-Equalizer
14

Schematic form of a digital storage
system
15

Coding for BD optical recording
•RLL- Run Length Limit
16

2.11 m 1.32 m 0.58 m 
17

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
18

Features of BD
With BD we can:
Record HDTV without any quality loss
Instantly skip to any spot on disc
Record one program while watching other on
the disc
Create playlists
Edit or reorder programs recorded on disc
Automatically search for an empty space on the
disc to avoid recording over a program
Access to web to download subtitles and other
extra features
20

Characteristics of Blu-ray disc
 Life Span
 Content Protection
 Capacity
 Cost
 Robustness of disc
 Compatible
21

Blu-ray Disc Applications
 High definition television recording
 High definition video distribution
 High definition camcorder archiving
 Mass data storage
22

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.
23

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
24

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