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Thread: Holographic Versatile Disc PPT PDF Seminar Report & Presentation

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Preassigned FDMA

Preassignment means if each station transmits up to 60 voice circuit and some of the channel are preassign to particular route. If these preassign channel are fully loaded then all call routed through these channels will be blocked even though there may be idle circuits on the other preassigned routes Read this topic
  1. #1
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    Pdf 32 Holographic Versatile Disc PPT PDF Seminar Report & Presentation

    Holographic Versatile Disc Paper Presentation & Seminar

    The Holographic Versatile Disc (HVD) is an optical disc technology developed between April 2004 and mid-2008 that can store up to several terabytes of data on an optical disc the same size as a CD, DVD or Blu-ray disc. It employs a technique known as collinear holography, whereby a green and red laser beam are collimated in a single beam. The green laser reads data encoded as laser interference fringes from a holographic layer near the top of the disc. A red laser is used as the reference beam to read servoinformation from a regular CD-style aluminium layer near the bottom. Servoinformation is used to monitor the position of the read head over the disc, similar to the head, track, and sector information on a conventional hard disk drive. On a CD or DVD this servoinformation is interspersed amongst the data.

    A dichroic mirror layer between the holographic data and the servo data reflects the green laser while letting the red laser pass through. This prevents interference from refraction of the green laser off the servo data pits and is an advance over past holographic storage media, which either experienced too much interference, or lacked the servo data entirely, making them incompatible with current CD and DVD drive technology.


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    Holographic Versatile Disc Paper Presentation & Seminar PDF Download

    Holographic Versatile Disc Paper Presentation & Seminar

    CONTENTS


    1. INTRODUCTION
    2. UNDERLYING TECHNOLOGY-HOLOGRAPHY
    3. RECORDING DATA
    4. READING DATA
    5. HVD-STRUCTURE
    6. COMPARISON
    7. TYPES : WORM & RW
    8. REFERENCES

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    Pdf 32 Holographic Versatile Disc Paper Presentation & Seminar PDF Download

    Holographic Versatile Disc Paper Presentation & Seminar

    CONTENTS


    •What is HVD ?
    •Holographic Versatile Disc Structure
    •Working Principal
    •HVD Write System
    •HVD Read System
    •How HVD compares Others ?
    •Advantages
    •Conclusion
    •References

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