IntroductionIn the communication systems, echo and noise will seriously affect speech communication quality, such as IP telephone, videophone and hand-free digital cell phone systems etc.
引言在通信系统中，例如IP电话、可视电话及免提数字蜂窝电话系统中，回声和噪声会严重影响通信质量。
Comparing to this, in communication of speech, the network communication based on IP has incredible growth rate, and has reduced the cost that launch the speech business.
相对于语音通信，基于IP的网络通信有着令人难以置信的增长速度，并且大大降低了开展语音业务的成本。
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