Based on audio hiding technology, echo hiding technology is presented with description of message embedding and extracting process.
基于声音隐藏技术，分析了回声隐藏的嵌入和提取过程。
On the basic of this, applications of echo hiding are discussed. Finally, the prospect of echo hiding is described.
在此基础上讨论了回声隐藏的应用范围，并对回声隐藏的发展趋势进行了展望。
Then it introduces some classical arithmetic of audio information hiding, such as Least Significant Bit, Phase Coding, Echo hiding. And we use them in our system to realize covert communication.
然后介绍了几种经典的音频信息隐藏算法，如最不重要位，相位编码和回声编码，并且将它们用在我们这套系统中实现了隐秘通信。
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