Research Of Digital Audio Watermarking Algorithm

In this paper, in order to protect the copyright of the audio data, the audio digital watermarking algorithm is researched based on a number of ways for the realization of effective security protection algorithms of audio information. This paper summarizes a systematic study of audio digital watermarking algorithm status and development at home and abroad, and outlines the work of related to this paper about the audio digital watermarking concepts, principles and techniques. The main content of research work is given.First of all, for the watermark in the transmission process will be subject to a variety of attacks and the existence of security issues, starting from the chaos theory, chaos theory is applied to the audio digital watermarking algorithm. The audio digital watermarking algorithm is proposed based on chaos theory. Chaos theory is combined with the audio digital watermarking algorithm from two angles. The first is to use chaotic sequences to encrypte the digital watermark embedded in the audio, and the second is the use of chaotic sequences to determine the watermark embedded in the audio section, which carried out a double encryption. In addition, the embedded algorithm is in the combination of quantitative principles, thus enhancing the accuracy of the extracted watermark, and the watermark extraction error rate is reduced.Secondly, for the robustness problem, a mixed-domain audio digital watermarking algorithm is proposed. The watermark is embedded into the low-frequency coefficients of wavelet transform domain. The adaptive algorithm is used to control the embedding strength, and the combination of DCT and DWT is to improve the robustness of the watermark. Multi-resolution wavelet transform features and the role of reconciliation and related capacity-shaped of discrete cosine transform are used fully. The error-correcting code technology is introduced to further enhance the watermark robustness. Some gains are made to resistant simultaneous attacks. The watermark robustness is of a certain increased and the watermark can not be perceived easily.Third, this article attempts to expand the integration point of chaos theory in watermarking system further more. The method of using chaotic systems to detect weak useful signal can effectively solve problem of the detection of weak desired signal in the background of strong noise. The audio digital watermarking algorithm is proposed based on chaotic phase-change detection. In the current literature, more discussions are about one-dimensional sinusoidal signal embedded in the image vector. On this basis, the chaotic oscillator phase-change detection techniques are studied for audio signal detection. The appropriate contribution is made for the rapid detection of audio watermark.Fourth, the modulation method for communication is applied in the audio digital watermarking. The audio digital watermarking algorithm is proposed based on spread spectrum modulation and frequency modulation chaos shift keying. The modulation method is applied to the watermark sequence encryption processing to enhance the security of the watermark. Means of the signal noised are the spread spectrum modulation and the frequency modulation chaos shift keying. So the watermark signal shows a class the nature of the noise relative to the audio signal.The watermark can not be uncovered easily by attackers in the transmission process to enhance the invisibility and security of the watermark.This paper's focus is on robustness, security and rapid detection of the audio digital watermark. The purpose is to seek some better audio digital watermarking algorithms. In research of the audio digital watermarking algorithm, many scholars and experts have made outstanding achievements and contributions. This article also is in the background of the proposed algorithm. All the improved ways is on the basis of our predecessors. Experimental results show that the algorithm is feasible to some extent.