Optical: systems and elements – Holographic system or element – Having defined page composer
Patent
1993-08-09
1996-04-23
Dzierzynski, Paul M.
Optical: systems and elements
Holographic system or element
Having defined page composer
359 29, 359107, 365125, 365216, G02B 532
Patent
active
055109128
ABSTRACT:
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.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 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-s) 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.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.
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Blaum Miguel M.
Siegel Paul H.
Sincerbox Glenn T.
Vardy Alexander
Blair Philip E.
Dzierzynski Paul M.
International Business Machines - Corporation
Jr. John Juba
Pintner James C.
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