一种自适应音频数字水印算法的研究与仿真

提出了一种自适应扩展回声音频数字水印算法。利用PN序列将音频信号的单回声内核进行扩展后作为水印信号,结合了回声隐藏的鲁棒性和扩频技术的保密性等特点,从而提高了水印算法的安全可靠性。基于心理声学模型设计二维模糊控制器,实现了水印嵌入强度的自适应。采用ABX主观测试和相关度水印检测测试对算法进行了仿真试验,通过将嵌入水印后的音频信号进行低通滤波、加入噪声以及重采样等方法来模仿音频信号在实际网络环境下可能遭受的各种攻击和干扰,仿真实验证明,算法具有良好的鲁棒性和不可知觉性。

Research and Simulation on Self-adaptive Digital Audio Watermarking

A Fuzzy Self-adaptive Digital Audio Watermarking Based on Time-Spread Echo Hiding algorithm was proposed. The single echo kernel of audio signal is spread by Pseudo Noise (PN) sequence and taken as watermark signal. Therefore, the algorithm achieves higher robustness and secrecy merits by combining the properties of good robustness of echo hiding and high secrecy of spread-spectrum techniques. A two dimension fuzzy controller was designed based on the Psychoacoustics models. The fuzzy inference algorithm ensures that the embedded watermark in the original audio is self-adaptive. The ABX subjective test and simulation experiment results show that the watermarks are imperceptible and robust against commonly used audio signal processing methods such as lowpass filter, noise, and resample procession etc.