Multimedia ppt chap6

Multimedia ppt chap6

• 1.
  OPTICAL STORAGE MEDIA RAJARAM PAKUR 690328
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  INTRODUCTION Magnetic Data Storage Low average access time  Higher storage cost for continuous media data Optical Storage Media  Higher storage density at a lower cost  Audio compact disk to Long play disks (LPs)  Commercially successful product 690328
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  HISTORY  1982 CompactDisc - Digital Audio (CD-DA)  1985 Compact Disc - Read Only Memory (CD-ROM)  1988 Compact Disc - Interactive (CD-I)  1989 Compact Disc - Read Only Memory/Extended Architecture (CD- ROM/XA)  1990 Compact Disc - Write Once (CD-WO), Compact Disc - Magneto- Optical (CD-MO)  1992 Photo Compact Disc (Photo-CD)  1995 Compact Disk - Read Write (CD-RW)  1996 Super Density (SD)  1997 Digital versatile(video) disk (DVD)developed 690328
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  BASIC TECHNOLOGY Physical structurefor Optical Storage Media (The Label) 690328
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  BASIC TECHNOLOGY(Conti..) Use theintensity of reflected laser light as an information source A laser beam of 780nm wavelength can be focused at 1µm The substrate layer is covered with a thin reflective layer Laser beam is focused on the reflective layer from the substrate layer The reflected beam has a strong intensity at the lands Weak intensity at the pits 690328
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  BASIC TECHNOLOGY(Conti..) Advantage overMagnetic Disk  Easily played back at a continuous data rate  We can stored 16000 tracks per inch, in comparison a floppy disk has 96 tracks per inch  Very good for long-term storage 690328
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   Data arestored in an analog-coded format on the disk  Video disk in the form of Laser Vision and serves as the output of motion pictures and audio  Laser vision disk has a diameter of 30cm and stores 2.6 GB  Also called the Video Long Play (VLP) disk  Motion picture is encoded as frequency modulation and the audio signal is mixed with the video signal VIDEO DISK FUNDAMENTALS 690328
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  VIDEO DISK FUNDAMENTALS(Conti..) Designed As ROM, Many Different WO Have Come Out Known As WORM (Write Once Read Many). For Example Interactive Video Disk. Diameter between 3.5 and 14 inch Storage Capacity 600 MB to 8 GB Advantage is, ability to store large amounts of data which may not be changed later Juke-boxes is used to increase the capacity 690328
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  ~..~ THANK YOU ~..~ 690328