Blu-ray technology and a brief preview of it's features.

4. Compact disc(CD)-650/700 MB
Specialty-We’ve been using it for • Digital versatile disc(DVD)
over 20 years • Specialty-it offers high
Wavelength of laser-780nm quality sound and video
Color of laser-RED • Wavelength of laser-650nm
• Color of laser-red
Blu-ray(bd)-25/50GB
Specialty-Can store huge data
in small space
Color of laser -blue

6. •Blu-ray was developed by
BDA, a group representing
makers of consumer
electronics, computer
hardware, and motion
pictures
•It uses blue-violet laser
developed by Shuji Nakamura
at Nichia corporation Mr.Shuji Nakamura

7. Format of BD
It comes in four different types
1. BD-ROM(read only)-for reading the
recorded content
2. BD-R(recordable)- for pc data storage
3. BD-RW-for pc data storage in writable
form
4. BD-RE(rewritable)-for HDTV recording

8. Single layer Double layer
The format offers more than five times
the storage capacity of traditional DVDs
and can hold up to on a single-layer
disc and on a dual-layer disc. This
extra capacity combined with the use of
advanced video and audio codes will
offer consumers an unprecedented HD
experience.

9. SINGLE DOUBLE
LAYER LAYER
A single-layer Blu-ray disc can hold A double-layer Blu-ray disc
25GB of data, a dramatic
improvement over DVD's 4.7GB. can hold 50 GB
This is enough for approximately 2.5 This is enough for approximately 4.5
hours of high-definition video or 13 hours of high-definition video or 20
hours of standard-definition video. hours of standard-definition video.

10. Pits: Spiral grooves that
run from the centre of
the disc to the edges
Bumps-other sides of
these edges(0.15
MICRONS)
Track pitch-Distance
between the two tracks Mode of storage-disc
stores digitally
of the pits on encoded data in PITS
surface(O.32 MICRONS)

12. Pits contain bumps.
Data is recorded within the layer provided within the Blu-
ray Disc (BD)
Discs store digitally encoded video and audio information
in pits -- spiral grooves that run from the center of the disc
to its edges. A laser reads the other side of these pits -- the
bumps -- to play the movie or program that is stored on the
DVD. The more data that is contained on a disc, the smaller
and more closely packed the pits must be. The smaller the
pits (and therefore the bumps), the more precise the
reading laser must be.
DATA TRANSFER RATE-36MBPS

14. CD DVD Blu-ray
Recording laser 780nm 650nm 405nm
wavelength
Thickness 1.11 0.6 0.1
Recording capacity 0.65gb 4.7gb 23305gb
25025gb
Line speed 1.20m/sec 3.49m/sec 5.28m/s
4.92m/s

15. COMPARISON BETWEEN BD AND
DVD
BD DVD
1. Can store large 1. Cannot store large
amount of data amount of data
2. It uses blue-violet 2. It uses Red-laser
ray..hence it can ray..hence it cannot
be concentrated be concentrated
accurately and accurately and hence
hence the data the data cannot be
can be compressed
compressed 3. Its thickness is 0.6
3. Its thickness is
0.1

18. A single sided 25 gigabyte Blu-ray disc hosts the capacity of approximately 36
CDs.
T o enable this huge capacity, the Blu-ray disc incorporates a track pitch of
0.32 microns, compared to the 0.74 microns track pitch of DVD disc. The
diameter of the laser spot is about one fifth as that of DVD. Because of the blue
violet laser short 405 nano meter recording wavelength and the object lenses
large 0.85 numerical aperture, the recording layer must be situated extremely
close to the disc surface.

20. BLU RAY ‘S DURABILITY
ADVANTAGE
 Various hard coating technologies make Bly ray
disc most durable and family -friendly”
 Hard-coating technology provides resistance to:
- Finger prints
- Marks
- Scratches
- Dust
 Much more ROBUST than today’s
polycarbonate-based CD/DVD’s (and HD DVD’s)

21. 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
 And many more…

22. Capacity: 25GB (single layer), 50GB (dual layer).
Tested up to 100GB, the theoretical
limit is 200GB.
Compression: MPEG-2, AVC MPEG-4, VC-1
Max Resolution: 1980x1080/24p, 601, 50i
Max Video Bitrates: 40Mbps
Audio Codec: Linear PCM, Dolby Digital, Dolby Digital
Plus, Dolby TrueHD, DTS, DTS HD
Max Audio Streams: 32 streams
Backers: Sony, Dell, Hewlett-Packard, Hitachi, LG
Electronics, Matsushita (Panasonic),
Mitsubishi, Philips, Pioneer, Samsung,
Sharp, TDK, Thomson Multimedia.
Possibly Microsoft.
Compatibility: Backwards-compatible with standard
DVD.
Interactivity: Java-based