基于LDPC码的数字音频水印算法研究

论文提出了一种基于低密度奇偶校验(LDPC)码的音频水印算法,对水印进行编码预处理后,采用时域去直流的方法并动态改变水印幅度嵌入水印,其中利用了人耳听觉系统的感知特性,把水印加在人耳感知极限下方。通过仿真实验结果表明,该算法具有较强的鲁棒性和不可感知性,而且在水印检测时不需要原始音频信号。

Research of Digital Audio Watermarking Algorithm Based on LDPC Codes

An audio watermarking algorithm based on low density parity check(LDPC) codes has been proposed in this paper.After the processing of watermark,we utilize the method of DC removal in the time domain,and change the magnitude of the watermark dynamically following the embedding of the watermark.In this algorithm,we make use of the perceptual characteris-tics of the human auditory system to embed the watermark below the audibility threshold.The experimental results show that the algorithm bears good robustness and imperceptibility,and does not require the use of the original audio signal for watermark detection.