Parallel-access optical memory for storing digital information on plastic holographic card

1996 ◽  
Author(s):  
Sergey B. Odinokov ◽  
Alexander F. Smyk ◽  
Leonid A. Bondarev
Keyword(s):  
Optical Memory ◽  
Digital Information ◽  
Parallel Access

scholarly journals ERROR CORRECTION DEVICE FOR OPTICAL MEMORY OF MASS APPLICATION

2017 ◽  
Vol 21 (6) ◽  
pp. 22-31
Author(s):  
S. I. Egorov ◽  
A. V. Krivonos
Keyword(s):  
Integrated Circuits ◽  
Error Correction ◽  
Iterative Decoding ◽  
Functional Organization ◽  
Block Diagram ◽  
Optical Memory ◽  
Code Word ◽  
Digital Information ◽  
Mass Storage ◽  
Hardware Complexity

Currently one of the most commonly used carriers of digital information is optical multi-purpose DVD discs. At the same time these carriers have a significant disadvantage, namely, a tendency to a relatively large number of errors in the reading of information due to damage of the recording layer during production or operation. The article presents the structural and functional organization of the error correction device for optical mass storage (optical DVDs) that implements the iterative decoding of the product of Reed-Solomon codes. It is given the block diagram of the device, which illustrates the relationships between the components of the device decoders iterations and describes the principle of the receipt and processing of data blocks in the device. The error correction device is N series-connected iterations decoders working on a pipelined basis. All its iterative decoders run in parallel, processing successively received data blocks from the channel. The structure of decoder iterations is disclosed and the functions of their constituent blocks are described with reference to the points of the decoding algorithm. The proposed device receives one code word symbol (8 bits) per 2 clock cycles and, when implementing a decoder on modern ASICs, is capable of providing a throughput of 2 Gbps at a processor clock speed of 500 MHz. This bandwidth allows the device to work in a continuous mode and processing data blocks at the rate of their arrival. Possible ways of increasing the capacity of the device are described. In addition, the article assesses the hardware complexity of the main units of the device, expressed in the number of gates and bits of memory required for its implementation using integrated circuits of a special purpose.

On-line image readout in CTEM

1994 ◽  
Vol 52 ◽  
pp. 400-401
Author(s):  
K.-H. Herrmann ◽  
W. D. Rau ◽  
R. Sikeler
Keyword(s):  
Primary Electron ◽  
Digital Information ◽  
Electron Hole ◽  
Detection Technology ◽  
Long Time ◽  
On Line ◽  
Electron Image ◽  
Optical Transfer ◽  
Detection Quantum Efficiency ◽  
Technical Solutions

Quantitative recording of electron patterns and their rapid conversion into digital information is an outstanding goal which the photoplate fails to solve satisfactorily. For a long time, LLL-TV cameras have been used for EM adjustment but due to their inferior pixel number they were never a real alternative to the photoplate. This situation has changed with the availability of scientific grade slow-scan charged coupled devices (CCD) with pixel numbers exceeding 106, photometric accuracy and, by Peltier cooling, both excellent storage and noise figures previously inaccessible in image detection technology. Again the electron image is converted into a photon image fed to the CCD by some light optical transfer link. Subsequently, some technical solutions are discussed using the detection quantum efficiency (DQE), resolution, pixel number and exposure range as figures of merit.A key quantity is the number of electron-hole pairs released in the CCD sensor by a single primary electron (PE) which can be estimated from the energy deposit ΔE in the scintillator,

SPATIAL CHAOS AND OPTICAL MEMORY

1988 ◽  
Vol 49 (C2) ◽  
pp. C2-451-C2-454
Author(s):  
W. J. FIRTH
Keyword(s):  
Optical Memory ◽  
Spatial Chaos

Responsive Architecture and the Problem of Obsolescence

2014 ◽  
Vol 8 (3) ◽  
pp. 95 ◽  
Author(s):  
Mark Meagher
Keyword(s):  
Computer Science ◽  
Digital Information ◽  
Material Response ◽  
Responsive Architecture ◽  
History Of ◽  
The One

Responsive architecture, a design field that has arisen in recent decades at the intersection of architecture and computer science, invokes a material response to digital information and implies the capacity of the building to respond dynamically to changing stimuli. The question I will address in the paper is whether it is possible for the responsive components of architecture to become a poetically expressive part of the building, and if so why this result has so rarely been achieved in contemporary and recent built work. The history of attitudes to- ward obsolescence in buildings is investigated as one explanation for the rarity of examples like the one considered here that successfully overcomes the rapid obsolescence of responsive components and makes these elements an integral part of the work of architecture. In conclusion I identify strategies for the design of responsive components as poetically expressive elements of architecture.

Prediction of Birefringence for Optical Memory Disk

1989 ◽  
Vol 4 (3) ◽  
pp. 132-142 ◽  
Author(s):  
T. Kanai ◽  
K. Shimizu ◽  
Y. Uryu
Keyword(s):  
Optical Memory
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