| 摘要 |
<p>An arrangement for embedding supplemental data (e.g. a watermark W) in an information signal (x). In an embodiment of the invention, the arrangement comprises a conventional sigma-delta modulator (20) for encoding an audio signal (x) and modifying means (2) for periodically replacing a bit of the encoded signal (y) by a bit (wi) of the watermark. In the same manner, a sync pattern (S) is embedded in the signal. The sync bits (si) are embedded at a smaller distance than the watermark bits. Preferably, the sync pattern is a pattern of contiguous bits which is typically not generated by the encoder. For the sigma-delta modulator, such a pattern is a run of ones followed by a substantially equally long run of zeroes, or vice versa.</p> |
