| Requirements from Related Industries |
| : |
Fierce competition was going on between the Toshiba-Matsushita
camp and the |
| |
Philips-Sony coalition team surrounding the newly introduced DVD
when the major US PC makers and Hollywood movie circles came up with
their own respective requirements for DVD development. |
|
 |
Hollywood Movie Industry Requirements |
| |
 |
High Capacity: 135 minutes on one side of a single disc |
|
High Resolution: Video resolution better than Laserdisc
based on MPEG-2 technology |
| |
(average video rate of 3.5 Mbps). |
|
High Quality Audio: 5.1 channel Dolby Digital Surround |
|
Multi Functions: Multi-language and many other feature
set. |
|
|
| |
|
Computer Industry Requirements |
|
|
Single format for computer and TV-based applications |
|
Backward read compatibility with existing CD-ROMs |
|
Forward compatibility with future R/W and WORM discs |
|
A single file system for all content and disc media types |
|
Low cost drives and discs |
|
No mandatory container (caddy or cartridge) |
|
Reliable data storage and retrieval |
|
High on-line capacity |
|
High performance for both sequential and non-sequential data types |
|
|
|
| The DVD-Video format finally came into being in 1996
satisfying all these requirements from the movie and computer industries.
Although a DVD disc is the same in size as a CD, it has a capacity
of nine times that of today's CDs, and so it is a much more sophisticated
mechanism. Following is a detailed differences between CD and DVD. |
| |
|
Differences between CD and DVD
|
|
Classification
|
CD
|
DVD
|
Remark
|
|
Type
|
Feature
|
|
|
|
|
|
|
DISC
|
Formats
|
CD-DA
(RED BOOK)
|
BOOK A
:PHYSICAL & LOGICAL
|
|
|
CD-ROM
(YELLOW BOOK)
|
BOOK B : VIDEO
|
|
|
CD-ROM XA,
PHOTO CD,
VIDEO CD (WHITE BOOK)
|
BOOK C : AUDIO
|
|
|
CD-I
(GREEN BOOK)
|
BOOK D
:WRITE ONCE(DVD-R)
|
|
|
CD-R, CD-RW
(ORANGE BOOK)
|
BOOK E
:REWRITABLE
(DVD-RAM)
|
|
|
CD-EXTRA,
ENHANCED CD
|
|
|
|
Disc
Capacity
|
SAME FOR ALL KINDS
OF DISCS
|
- SSSL : 4.7GB
- SSDL : 8.5GB
- DSSL : 9.4GB
- DSDL : 17.0GB
|
|
|
Wavelength
|
780nm
|
650nm
|
|
|
T.P
|
1.6㎛
|
0.74㎛
|
|
|
Thickness
|
1.2mm
|
0.6mm ×2 EA
|
|
|
Lens N.A
|
0.45
|
0.6
|
|
|
Modulation
|
EFM
|
EFM+
|
|
|
ECC
|
CIRC
|
RS-PC
|
|
|
CLV
|
1.2 ~ 1.4m/s
|
3.49m/s
|
CLV
|
|
Data Bit Rate
|
1.2Mbps
|
11.08Mbps
|
|
|
User Data
/ Sector
|
MODE 1 : 2048 BYTES
MODE 2 : 2332 BYTES
|
2048 BYTES
|
|
|
File Format
|
ISO9660
(Except for CD-DA )
|
UDF-BRIDGE
(ISO9660 Compatible)
|
|
|
RPM
|
200 ~ 500 RPM
|
500 ~ 1500 RPM
|
|
|
Application
(Video)
|
Compression
Technology
|
MPEG-1
(Video CD)
|
MPEG-2
(VIDEO CD)
|
|
|
Playing time
|
70 mins
|
135 mins
|
|
|
Audio Channels
|
2 CH
|
5.1 CH
|
|
|
|
