Loading patent…
AssigneeInternational Business Machines Corporation
InventorsMiguel Mario Blaum, Paul Howard Siegel, Glenn Tavernia Sincerbox, Alexander Vardy
Estimating the term…
A modulator apparatus for modulating arrays of input data V.sub.in to be stored in a holographic recording medium is disclosed wherein the final output data array V.sub.out has frequent transitions from light to dark and from dark to light in either dimension across the data page and has the total amount of illuminated regions throughout the entire data page held constant. These two constraints are achieved by a first set of control arrays obtained from two fixed sets of m.times.n binary arrays {A.sub.0, A.sub.1, . . . , A.sub.n } and {B.sub.0, B.sub.1, . . . , B.sub.m } which in turn are obtained from fixed sets of binary control vectors {a.sub.0, a.sub.1, . . . , a.sub.n }, {b.sub.0, b.sub.1, . . . , b.sub.m }, respectively. The control vectors a.sub.0, a.sub.1, . . . , a.sub.n are any n+1 fixed elements of the inverse mapping, .phi..sup.-1 (C.sub.1), of the (t-2) error-correcting code C.sub.1 of length m. The control vectors b.sub.0, b.sub.1, . . . , b.sub.m are any m+1 fixed elements of the inverse mapping, .phi..sup.-1 (C.sub.2), of the (t-2) error correcting code C.sub.2 of length n. The first constraint is achieved by V'.sub.in =V.sub.in .sym.(A.sym.B). In order to balance the modulated array, a second set of control arrays {W.sub.0, W.sub.1, W.sub.2. . . , W.sub.mn-1 } is obtained from the set of control vectors {w.sub.0, w.sub.1, w.sub.2. . . , w.sub.mn-1 }. The second constraint is achieved by complementing the bits of the input binary array V'.sub.in in a horizontal readout order terminating after the first i bits. The final modulated output array V.sub.out =V'.sub.in .sym.W simultaneously satisfies both constraints.
A modulator apparatus for modulating a multi-dimensional input data array to produce an output modulated data array, the apparatus comprising:
A modulator apparatus for modulating a multi-dimensional input data array page V.sub.in to produce an output modulated array V.sub.out, the apparatus comprising:
A modulator apparatus for modulating a multi-dimensional input data array page V.sub.in to produce a balanced output modulated data array page V.sub.out such that the number of 1's and 0's in V.sub.out are equal, the apparatus comprising:
A method for modulating a multi-dimensional input data array to produce an output modulated data array, the method comprising the steps of:
A method for modulating a multi-dimensional input data array V.sub.in, to produce an output modulated data array page V.sub.out such that, in each row and column of the output modulated data array V.sub.out, there are at least t transitions, where t is a predetermined integer greater than 2, the method comprising the steps of:
A method for modulating a multi-dimensional input data array page V.sub.in such that, in each row and column of an output modulated data array page V.sub.out, there are at least t transitions, where t is a predetermined integer greater than 2, the method comprising the steps of:
A computer program product, for use in a holographic storage and retrieval computer system, for producing an output modulated data array from an input data array, the computer program product comprising:
Dependencies are inferred from the claim text.