| 摘要 |
<p>The invention relates to a method for encoding a stream of bits of a signal relating to a binary source into a stream of bits of a signal relating to a binary channel, the binary source comprising a main source and a secondary source, the main source being encoded in a main channel (2) by multi-level coding and the secondary source being encoded in a secondary channel (4), the secondary channel being embedded in the main channel in order to form the binary channel, wherein the secondary channel is divided in at least a first section comprising user data and a second section comprising non user data (5). The invention further relates to an encoder to carry out this method, a decoder to decode the stream of bits relating to the binary channel and a record carrier provided with the encoded signal in the form of optically detectable marks. By means of the invention copy protection can be improved.</p> |
