METHOD AND APPARATUS FOR QUANTISATION INDEX MODULATION FOR WATERMARKING AN INPUT SIGNAL

申请公布号：EP2729933(A1)

申请号：EP20120730495

申请日期：2012.06.25

申请公布日期：2014.05.14

申请人：

THOMSON LICENSING

发明人：JAX, PETER

分类号：G10L19/018;G10L19/035

主分类号：G10L19/018

摘要：<p>With quantisation index modulation QIM it is possible to achieve a very high data rate, and the capacity of the watermark transmission is mostly independent of the characteristics of the original audio signal, but the audio quality suffers from degradation with each watermark embedding-and-removal step. In order to avoid degradation of the audio quality, the inventive audio signal watermarking uses specific quantiser curves in time domain and in particular in frequency domain for embedding the watermark message into the audio signal, whereby the processing is almost perfectly reversible. Furthermore, it has embedded a power constraint in order to guarantee that the modifications of the audio signal due to the watermark embedding are inaudible.</p>

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