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中文摘要：
现今,移动通信网络已经发展到了第三代,随着3G网络的不断发展,研究3G网络隐蔽通信是十分必要的.语音编码过程中利用编码参数隐藏信息是现今的一个研究热点.基音周期是描述音源特征的一个主要参数,基于基音周期的修改较难检测的特点,在自适应码本搜索的过程中,提出一种在3G话音中利用基音周期参数隐藏信息的算法,使用该算法可以在3G通信的过程中嵌入隐秘信息.该算法可以抵抗基于浊音特性的语音压缩域隐写分析.仿真实验的结果表明该方法对合成语音质量的影响很小,具有良好的隐蔽信息传输性能.
英文摘要：
Now,mobile communication network has attained thired generation,with the 3G network technology mature and scale unceasing expansion,it is terribly essential to study the 3G covert channel.The research of covert channel based on change coding parameter is a hot spot during the encoding process of the speech.Pitch period is an important parameter to descrip the characteristic of audio.It is diffcult to detect the modification of pitch period,in the process of searching adaptive codebook,new methods of hiding data in the pitch period data of the Adaptive Multi-Rate（AMR） speech codec are proposed,we can embedded information into the content of speech by the algorithm during a voice conversation,this method prevent steganalysis of speech compressed based on voicing features.The simulation result show that this method has good performance of hidden information transmission.
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