Applications of digital watermarking technology in audio signals

The features and performances of audio watermarking techniques currently be ing used are presented. In order to make a comparison, an adaptive content- based watermark embedding and extracting scheme in audio signals is propose d. The watermark embedding scheme is highly related to the signal contents. This method can obtain a good tradeoff between inaudibility and robustness in embedded signals. First the original audio signal is divided adaptively into different kinds of segments according to its characteristics in the t ime domain. Then the embedding scheme is designed for each segment accordin g to the properties in the frequency domain. Finally a multiple-echo hoppin g technique is used to embed and extract watermarks. This method is compare d with other current techniques of audio watermarking and results of the ev aluation are presented.