基于共生特性的G.729A基音调制信息隐藏的检测

提出了一种G.729A自适应码本分组基音调制信息隐藏的检测算法.对语音码流的分析发现,通过基音预测进行信息隐藏将改变相邻语音帧中基音周期估计值的共生特性.通过量化这种共生特性,并经过PCA(Principal Component Analysis,主成分分析)降维获得对隐写检测敏感的特征向量.最后基于特征向量和SVM (Support Vector Machine,支持向量机)构建隐写检测器.对不同语音样本数据集的检测表明,当语音长度在2s及以上时,检测正确率均超过96%.此检测算法是一种有效的压缩域信息隐藏检测方法.     

Coherence-Time of Matched-Field Processing in Shallow Water in the Presence of Linear Internal Waves

Relationships among the signal coherence-time of matched-field processing （MFP）, the acoustic frequency, the source-receiver range, and the sound speed standard deviation （STD） caused by internal waves in shallow water, are numerically investigated based on oceanographic data from two shallow water experiments. It is found that the coherence-time can be fitted with an inverse square-root power of range, a near inverse 1 power of frequency, and inverse 1.3 power of sound speed STD.     

浅海中内波对匹配场时间相关的影响

利用一次夏季浅海水文实验资料,数值仿真研究有线性内波和孤立子内波存在条件下的匹配场时间相关性.考察和总结了有内波存在时不同声源频率、声源深度和内波幅度等参数对匹配场时间相关的影响.研究结果表明:由于内波与声场的相互作用,匹配场时间相关长度会随着线性内波的平均能流密度及孤立子内波幅度的增大而减小;频率越高,声波穿过内波场时的匹配场时间相关下降的越快;声源位于跃层下时的匹配场时间相关明显的优于跃层上的情况;孤立子内波距声源的位置对匹配场时间相关影响相对较小.