Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2007-04-03
2007-04-03
Tran, Thang V. (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S059230
Reexamination Certificate
active
09932491
ABSTRACT:
A method and apparatus for modulating multilevel data arrays to make them suitable for storage in multidimensional storage media, such as in holographic storage. In order to get a uniform signal of constant energy at the recording plane, first the multilevel data array, Vout, displayed on a spatial light modulator, has frequent transitions between symbols of different levels, and second it has constant energy. The energy is defined as the summation of the values of the symbols in the data array. The first constraint is achieved using V′in=Vin⊕qM(q, ZO), where ⊕qstands for the modulo-q addition operation; M(q, Zo) is a data array with randomly distributed symbols of q levels, where q is the number of levels and ZOis the seed used to generate the random multilevel data array. In order to equalize the energy of the modulated data array V′in, a q-ary balanced complementary method is used to complement the symbols of the input multilevel data array, V′in, in a horizontal row-by-row readout order terminating after the first ii symbols. The final modulated output data array, Vout=|Ci,j−V′in|, simultaneously satisfies both the constraints, where the elements of Ci,jare (q−l)'s for the first ii elements in a horizontal row-by-row readout order, the others are O′s.
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Australian Patent Office Search Report dated Aug. 23, 2000, 5 pages.
Chong Tow Chong
Li Jun
Liu JingFeng
Phua Cheng Chiang
Wu Yi Hong
Chu Kim-Kwok
Data Storage Institute
Jenkens & Gilchrist P.C.
Tran Thang V.
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