Audio zero-digital watermarking algorithm based on energy difference of wavelet coefficients
基于小波系数能量差值的音频“零数字”水印算法

An audio zero-digital watermarking algorithm based on energy difference of wavelet coefficients was proposed. Original audio signal was decomposed by wavelet transform. And the energy differences of the approximation coefficients and detail coefficients were collected and classified into two classes according to the relationship between the energy differences and the thresholds. In this way, the watermarks were embedded and extracted. The restoration of the linear scaling was used to resist the influence of the linear scaling on time axis. The experimental results show that this algorithm is robust to many operations and attacks on digital audio signal, such as low-pass filtering, re-sampling, re-quantifying, echo jamming and MPEG encoding.