CODER AND DECODER OF HOLOGRAPHIC DIGITAL DATA STORAGE SYSTEM, AND METHOD FOR CODING AND DECODING RELATED ITS SYSTEM

摘要

PURPOSE: A coding and decoding apparatus and method in a holographic digital data storage system are provided to improve a code rate of data. CONSTITUTION: A coding apparatus of a holographic digital data storage system that stores holographic digital data in a storage medium by pages using a reference beam and an object beam includes an input unit(102) and an N-bit modulator(104). The input unit receives the holographic digital page data. The N-bit modulator modulates the holographic digital page data to N-bit data such that adjacent bit values in the N-bit data increase or decrease, and provides the modulated N-bit data to the holographic digital data storage system as coding data. The N bits are obtained by grouping optical intensity levels of more than 3 level into N groups.