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Abstract

Embodiments of the invention include a method and apparatus for modulating data retrieved from page-wise memory systems such as holographic memory systems. The inventive method uses the detection of one or more test signals included within stored data image pages to estimate the behavior of the retrieved data image pages and to normalize the retrieved information accordingly. The method includes allocating a portion of the data image pages of interest for one or more determinable test signals and incorporating the test signal information into the data image pages prior to storage of the data image pages within the storage medium. Upon retrieval of the data image pages from the storage medium, the test signals are detected and used to form the basis of estimated data member behavior across individual data image pages and, alternatively, from one data image page to another. Based on the estimated behavior, appropriate normalization is performed on the data image pages. Advantageously, embodiments of the invention provide enhanced compensation for reproduction inconsistencies existing throughout the data image pages, e.g., inconsistencies inherently caused by holographic storage systems. Alternatively, the behavior estimation is supplemented with generation profiles indicating the behavior of data within the data image pages. The generated profile is used, e.g., to assist in normalizing the data image pages. Also, interpolation techniques alternatively assist the behavior estimation and/or the normalization of the data image pages.

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First Claim