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在视频会议系统中 ,回声和背景噪声是影响系统通话质量的两个重要因素 .本文从回声产生的机理和常规消回声、消噪声的方法着手 ,研究了一种具有消除背景噪声功能的新的 AEC,即 AENC(Acoustic Echo and NoiseCanceller)的设计方案 ,并在理论上对其进行了分析、论证 .结果表明 ,这种 AENC在理论上完全能够同时实现消回声和消背景噪声两种功能 .它在 IP电话、可视电话及免提的数字蜂窝电话等扬声器 /传声器通信系统中也具有广阔的应用前景 .
In the video conferencing system, echo and background noise are two important factors that affect the quality of the system call.This paper starts with the mechanism of echo generation and the methods of eliminating echo and eliminating noise, and studies a new method that has the function of eliminating background noise AEC, that is, AENC (Acoustic Echo and NoiseCanceller) design, and in theory it was analyzed and demonstrated.The results show that this AENC can theoretically complete both echo cancellation and background noise cancellation two functions. In IP phones, video phones and hands-free digital cellular phones and other speaker / microphone communication system also has broad application prospects.