Patent ID: 7692835
Filing Date: 2010-04-06
Classification: G03H,G11B,Y10S

Abstract:
1. A recording apparatus for recording data as element holograms on a hologram recording medium, comprising: two-dimensional modulation means configured to convert the recording data into a two-dimensional code symbol for each predetermined data unit amount; synchronization signal generation means configured to generate a plurality of main synchronization symbols each from a two-dimensional pattern; and physical page generation means configured to generate a plurality of group main syncs each from the two-dimensional code symbols obtained by the conversion by said two-dimensional modulation means and a main synchronization symbol selected in a predetermined order from the plurality of main synchronization symbols generated by said synchronization signal generation means and to two-dimensionally arrange the generated group main syncs to generate a physical page, wherein the two-dimensional code symbol is an n×n square array, and the main synchronization symbol is in an (n·m)×(n·m) square array, wherein m and n are positive integers, and said two-dimensional modulation means converts a data type represented by the predetermined data unit amount, in which the recording data are converted into the two-dimensional code symbol, on the two-dimensional code symbol with a combination array of a first type of data.