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This paper presents a robust audio watermarking scheme based on spread spectrum in frequency domain using constant amplitude zero autocorrelation (CAZAC) sequence. First, the watermark bits are modulated by using M-ary phase shift keying (PSK), and then the modulated symbols are spread in phase by using the CAZAC sequence. At the extractor, the embedded information is recovered by despreading the...
This paper presents an informed embedding method for code division multiple access (CDMA) based robust watermarking. First, a generalized model for CDMA-based watermarking with informed embedding is described, taking into account more detailed host information and possible pre-processing operations on the watermark at both the embedder and the extractor. Then, as special cases of this model, several...
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