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随着信息技术的发展，IP电话已成为Internet上实现实时传送语音信号的一种新型的电信业务，因而具有广泛的研究应用前景。在IP电话系统中，对语音的处理主要是进行低速率语音编解码，并针对IP电话系统中不可避免的回声问题进行必要的回声消除处理。IP电话系统的回声源复杂，回
With the development of information technology, IP telephony has become a new type of telecom service on the Internet for real-time transmission of voice signals. Therefore, it has a wide range of research applications. In IP telephony systems, the processing of speech is primarily low-rate voice coding and decoding, and the necessary echo-canceling processing for the unavoidable echo problems in IP telephony systems. The echo source of the IP phone system is complex and back