10-05-2012, 01:20 PM
HOLOGRAPHIC MEMORY
PRESENTATION.pptx (Size: 359.3 KB / Downloads: 37)
#Data from more than 1,000 CDs could fit on a holographic memory system.
# Most computer hard drives only hold 10 to 40 GB of data, a small fraction of what a holographic memory system might hold.
# Holographic memory offers the possibility of storing 1 terabyte (TB) of data in a sugar-cube-sized crystal.
# A terabyte of data equals 1,000 gigabytes, 1 million megabyte or 1 trillion bytes.
DATA STORAGE
To produce a recording of the phase of the light wave at each point in an image , holography uses a reference beam which is combined with the light from the scene or object (the object beam). Optical interference between the reference beam and the object beam , due to the superposition of the light waves , produces a series of intensity fringes that can be recorded on standard photographic film . These fringes form a type of diffraction grating on the film , which is called the hologram .
CODING & SIGNAL PROCESSING
In a data storage system (holographic memory) ,the coding & signal processing is to reduce the BER (binary encoded representation) .This is stress free and less possibility of error is there .It is easily understandable to the user .Coding and signal processing includes several qualitatively distinct elements which are described as below :-
ECC (Encoder) :- It ends the repetition of the data and provide protection from various noise sources .Then it passes to modulation encoder which then fits the data to the channel which then saves the data to be corrupted by channel errors and give a clear channel output .
INTERPIXEL INTERFERENCE :- In this the amount of energy at one particular pixel infects data at near by pixel .This arises from optical diffraction in the imaging system .
PRESENTATION.pptx (Size: 359.3 KB / Downloads: 37)
#Data from more than 1,000 CDs could fit on a holographic memory system.
# Most computer hard drives only hold 10 to 40 GB of data, a small fraction of what a holographic memory system might hold.
# Holographic memory offers the possibility of storing 1 terabyte (TB) of data in a sugar-cube-sized crystal.
# A terabyte of data equals 1,000 gigabytes, 1 million megabyte or 1 trillion bytes.
DATA STORAGE
To produce a recording of the phase of the light wave at each point in an image , holography uses a reference beam which is combined with the light from the scene or object (the object beam). Optical interference between the reference beam and the object beam , due to the superposition of the light waves , produces a series of intensity fringes that can be recorded on standard photographic film . These fringes form a type of diffraction grating on the film , which is called the hologram .
CODING & SIGNAL PROCESSING
In a data storage system (holographic memory) ,the coding & signal processing is to reduce the BER (binary encoded representation) .This is stress free and less possibility of error is there .It is easily understandable to the user .Coding and signal processing includes several qualitatively distinct elements which are described as below :-
ECC (Encoder) :- It ends the repetition of the data and provide protection from various noise sources .Then it passes to modulation encoder which then fits the data to the channel which then saves the data to be corrupted by channel errors and give a clear channel output .
INTERPIXEL INTERFERENCE :- In this the amount of energy at one particular pixel infects data at near by pixel .This arises from optical diffraction in the imaging system .