Method and apparatus for determining and using the

专利名称：Method and apparatus for determining and

using the sampling frequency for decodingwatermark information embedded in areceived signal sampled with an originalsampling frequency at encoder side

发明人：Voessing, Walter,Gries, Ulrich,Baum, Peter,

Georg

申请号：EP09150371.4申请日：20090112公开号：EP2083419B1公开日：20110803

摘要：Many watermarking systems make use of correlation for calculating a detectionmetric, which means that reference patterns are generated at encoder side and areembedded inside the audio or video signal, dependent on the message to be embedded.The same reference patterns are generated at decoder side. The embedded message isdecoded by correlating the reference patterns with the watermarked signal. Thewatermark detector decides, depending on the size of the correlation result values,whether or not a given reference pattern was embedded. However, decoding

watermarked audio or video signals is difficult if the link between the watermark encoderand the watermark decoder is not a digital one, for example an acoustic path. Accordingto the invention, a re-sampler control unit controls the sampling frequency of a re-sampler, in connection with a watermark decoder that outputs, in addition to thewatermark information bits, a corresponding confidence value that is derived from the

correlation result and that is used for synchronising the re-sampler sampling frequencywith the original sampling frequency of the watermarked signal. The synchronisationprocessing includes a search mode and a synchronised mode.

申请人：THOMSON LICENSING

地址：FR

国籍：FR

代理机构：Hartnack, Wolfgang

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