Device And Method For Encoding A Secondary Information Of A Secondary Channel Into A Channel Data Stream Of A Primary Channel

摘要

The present invention relates to a device in a corresponding method for encoding a secondary information (r) of a secondary channel into a channel data stream (3) of a primary channel, said channel data stream (3) comprising at least two symbol rows of channel symbols one-dimensionally evolving along a first direction (t) and aligned with each other along a second direction (r), said two directions constituting a two-dimensional lattice of symbol positions. To provide a device and a method for encoding which can be used in a two-dimensional storage system, it is proposed that the device comprises:—a primary encoder (11) for encoding a primary information (1) into said primary channel data stream (3) of said primary channel,—a secondary encoder (12) for encoding said secondary information (2) into a secondary channel data stream (6) for embedding into the recorded signal of said primary channel data stream (3) and—a parameter modulation means (13) for varying a recording parameter (7) for one or more symbol rows based on said secondary information around an average value (9) using a variation parameter (5), said recording parameter (7) being used for recording said primary channel data stream (3) on a record carrier (21), said variations being made such that said average value (9) remains substantially constant and that said modulations can be detected by a decoding device, said secondary information being encoded into said variations.