Two-dimensional low-pass filtering code apparatus and method

Details Two-dimensional low-pass filtering code apparatus and method Two-dimensional low-pass filtering code apparatus and method

1996-09-27

1999-05-25

Chan, Jason

Pulse or digital communications

Pulse code modulation

365130, 386 33, 386124, H04B 1404

Patent

active

059075813

ABSTRACT:
A one-dimensional data stream is encoded into a two-dimensional data array with reduced high frequency components, for recording on a two-dimensional recording device, such as a holographic storage device. A two-dimensional data array read from the two-dimensional recording device is decoded into the original one-dimensional data stream. To encode, a one-dimensional data stream is partitioned into a plurality of chunks of data. Each chunk of data is partitioned into a plurality of groups of bits. Each group of bits is encoded into a two dimensional data array according to a predefined constraint. A plurality of two-dimensional data arrays are concatenated into a data strip. A plurality of data strips are then assembled into a complete two-dimensional data block. To decode, a two-dimensional data stream is partitioned into multiple small two-dimensional arrays. Each array is decoded into a multi-bit group. In one embodiment, this decoding is a function of other nearby groups. Multi-bit groups are assembled to form a long chunk. Long chunks are assembled to form a one-dimensional data stream.

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