Research On Audio Watermarking Scheme Based On Nonuniform Discrete Fourier Transform

In recent years, the popularization of computer network communication technologies has brought deep and wide communication for multimedia information such as audio signal. The process of exchange and transmission of audio data becomes oversimplified relatively; however, the complete transparency, easy manipulation of network information and various convenient signal process operation provide the chance to distribute and copy audio data without any trace, for instance, anyone can obtain others' original works via the Internet easily, some people even implement arbitrary reproduction and modification on the original works without the author's promise. These actions violate author's rights and welfare seriously. Thus, the copyright protection and integrity of audio data has become an urgent problem which cries for countermeasures. In the current copyright protection field, robust audio watermarking as one of the most effective methods has attracted many eyes of academic and business fields.This paper dedicates to research on NDFT-based audio watermarking schemes. We have got some research works shown as follows:1. Introduce the research background and significance of this topic; analyze the related concepts and characteristics; give priority to robust audio watermarking techniques, take several typical schemes as example to summarize and analyze the current status of audio watermarking schemes;2. Summarize the audio watermarking schemes based on traditional discrete Fourier transform (DFT); taken a typical DFT-based audio watermark scheme as an example, provide its security analysis; originally propose a novel transform-domain attack method and show the attack results. The simulation experiments prove its feasibility.3. Give the basic concept of nonuniform discrete Fourier transform (NDFT), basal properties, realized method of fast algorithm, and some applications based on NDFT; provide the theoretical concept for NDFT-based audio watermarking schemes; 4. Make use of the characteristics of nonuniform discrete Fourier transform (NDFT), which could set up arbitrary frequency points according to practical needs, originally propose a NDFT-domain audio watermarking scheme based on chaotic sequence used for selecting frequency points; Compared with DFT-based audio watermarking scheme, the proposed algorithm is validate, the whole system is not only simple but also highly secure.Aiming at the flaw of chaotic sequence which may be predicted, adopt coupled chaotic frequency hopping sequence to select NDFT-domain frequency points, a NDFT-domain audio watermarking scheme is proposed. The security of whole system is enhanced greatly.