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Bluray disc-ppt-by-dhruv2-1222350645931113-9
 

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    Bluray disc-ppt-by-dhruv2-1222350645931113-9 Bluray disc-ppt-by-dhruv2-1222350645931113-9 Presentation Transcript

    • BY VINOD KUMAR.M
    •  
    • HISTORY
      • 1 st GENERATION:
      • Compact disc (CD): --- 650/700 MB
      • Wavelength of laser which reads data: 780 nm
      • Color of laser: Red
      • 2 nd GENERATION:
      • Digital versatile disc (DVD): --- 4.7 GB
      • It offers high quality sound and video than CD.
      • Wavelength of laser which reads data: 650 nm
      • Color of laser: Red
    • HISTORY
      • 3 rd GENERATION :
      • Blu-ray disc (BD): --- 25/50 GB
      • -Next generation optical disc format.
      • -Wavelength of laser which reads data: 405 nm
      • -Color of laser: Blue-violet which was developed by
      • SHUJI NAKAMURA
      • at NICHIA CORPORATION
    • THE NAME
      • The blu-ray name is a combination of “blue”, for the color of the laser that is used and “ray” for optical ray.
      • The “e” in “blue” was purposefully left off, according to the manufacturers, because an everyday word cannot be a trademark.
    • TYPES OF BD:
      • SINGLE LAYER :
      • Can hold data up to 25/27 GB that means 2 hrs of HD video or about 13 hrs of standard video.
      • DOUBLE LAYER :
      • Can hold data up to 50 GB that means 4.5 hrs of HD video or more than 20 hrs of standard video.
    •  
    • SISE OF THE DISC
    • THE TECHNOLOGY
      • So, in blu-ray disc:
      • Pit size – 0.15 microns ( more than twice as small as the pits on DVD )
      • Track-pitch is : 0.32 microns
      • Laser needed : blue-violet laser (405 nm)
      • Data transfer rate : 36 Mbps
      • The Blue-laser’s shorter wavelength makes it possible to store more information on a 12 cm CD/DVD size disc. The minimum spot size on which a laser can be focused is limited by diffraction ,and depends on the wavelength of the high and the numerical aperture of the lens used to focus it.
    • THE TECHNOLOGY
      • Pits : spiral grooves that run from the centre of the disc to its edges
      • Track pitch : it is the distance between the two tracks (of pits) on the surface.
    •  
    •  
    • BLU RAY ‘S DURABILITY ADVANTAGE
      • Various hard coating technologies make Blu ray disc most durable and family -friendly”
      • Hard-coating technology provides resistance to:
      • - Finger prints
      • - Marks
      • - Scratches
      • - Dust
    • 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…
    •  
    •  
    • Queries?