Patent ID: 7433825
Filing Date: 2008-10-07
Classification: H03M

Abstract:
1. Apparatus for reading a data stream, which comprises a multitude of raster points as reference points, the raster points specifying a raster, two adjacent raster points defining a segment, wherein the data stream comprises a plurality of sets of code words, a first set of code words being written in the first direction and a second set of code words being written in a second direction, the code words of the second set being assigned to segments of the data stream in accordance with a predetermined assignment rule, such that each code word of a set being assigned to a different segment, wherein a code word of the second set is distributed over more than one segment in accordance with a predetermined rule, the apparatus comprising: a first device for reading in a first direction of reading which corresponds to the first direction of writing; a second device for reading in a second direction of reading which is opposite to the first direction of reading; and a control device wherein the control device is adapted for jumping at least to a further segment different from the segment, in which the part of the code word of the second set has been found, in accordance with the predetermined rule, when all segments have been searched for code words of the second set in accordance with the predetermined assignment rule and at least only a part of the code word of the second set has been found in a segment and the code word of the second set is still not complete, and wherein the control device is adapted for obtaining the at least one codes word of the second set completely or a further part of the at least one code word of the second set from the further segment; and a decoder for decoding the code words of the first set and the code words of the second set to obtain a decoded signal.