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。

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.

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在低比特率音频感觉编码中，预回声失真更为突出，而对其处理的前提是瞬态信号的有效检测。

In perceptual audio coding with low bit rate application, the pre-echo artifact is more distinct, and the effective detection of transient signals is the precondition.

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