一种基于基音周期估计的音频水印算法

提出了一种水印信号与载体信号均为语音的数字音频水印算法．主要由用混沌序列对音频水印加密，基于载体信号基音周期估计确定水印嵌入位置和根据量化步长△确定水印嵌入强度等关键步骤所组成．仿真结果表明，该算法不仅具有较好的透明性，而且也对叠加噪声、低通滤波、重新采样等攻击具有较好的鲁棒性．

An audio watermark algorithm based on pitch estimation

A digital audio watermarking algorithm is presented in which both watermarking signal and original signal are audio. In the method, the audio watermarking is encrypted using chaotic sequences, the embedding position is determined in accordance with pitch estimation of the speech signals, and the embedded watermarking intensity is determined according to the quantization step size. Simulation results show that the proposed watermarking scheme possesses perfect transparency and good robustness against general signal-processing operations such as noise addi- tion, low pass filtering, and re-sampling.