| Summary: | 碩士 === 國立東華大學 === 資訊工程學系 === 92 === In audio signals, with the widespread use of Internet and proliferation of digital audio distribution in MP3 form make the copyright protection of digital audio works more and more important. In this thesis, a DWT-based digital audio watermarking is proposed. With the Discrete Wavelet Transform（DWT）, the audio signal can be transformed into frequency domain ranging from low frequency to high frequency. Besides, the high frequency spectrum is less sensitive to human ear. That is the reason why the high frequency component is usually discarded in the compression process. Therefore, information to be hidden can be embedded into the low frequency component to against the compression attack.
In our experiments, the logo of National Dong Hwa University (NDHU) is embedded into an audio signal. The performance of the proposed technique is evaluated by the normalized correlation between the original logo and the extracted one. Experiment results show that the proposed algorithm is robust to the compression and noise attacks.
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