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中文摘要：
随着VolP技术在近年来的快速发展，互联网语音通信得到了越来越多的应用，IP电话的语音通信质量成为制约其发展的重要因素，VolP系统中远端信号会返回传递给说话人端从而引起回声，严重影响通话质量。所研究的Speex编码器中的频域MDF回声消除算法是通过估计最佳的LMS算法自适应变步长，同时结合NLMS滤波器消除远端信号的回声，达到提高语音通话舒适度的目的，给出了Speex中回声消除算法的原理和参数分析，并进行实际系统测试和性能评估。
英文摘要：
With the development of VoIP technology in recent years, speech communication is applied more, and the quality of speech communication is the main factor that constrains its development. Far end signal returns to the speaker in the VoIP system and results in the quality decreasing, which severely affect the communication quality. MDF algorithm in frequency domain in Speex codec evaluates the optimal LMS step, combining with the NLMS algorithm can reduce the echo of far end signal, and enhance the cosiness of speech communication. In this paper, principles and parameters are analyzed, and practical system testing and performance of the algorithm are conducted.
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