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单词 Echo canceller
释义

Echo canceller

中文百科

回音消除 Echo suppression and cancellation

（重定向自Echo canceller）

回音消除（Acoustic Echo Cancelling）是透过音波干扰方式消除麦克风与喇叭因空气产生回受路径（feedback path）而产生的杂音。

在讲电话时，回声像是在峡谷大喊大叫。回声是听到的声音的反射经一段时间后，又听到延迟的原音。在电话上，如果延迟是相当明显（多于几百毫秒），它被认为是恼人的。

回声消除器是替代早期的回声抑制器 ，最初在20世纪50年代开发的控制造成长时间的延迟卫星通信电路的回声。回声消除理论是在AT＆T 贝尔实验室。回声消除器的概念是合成的回声的估计值从讲话者的信号，并减去该合成从返回路径，而不是切换进/出的路径衰减。

英语百科

Echo suppression and cancellation 回音消除

（重定向自Echo canceller）
An adaptive echo canceler for a telephone circuit. The function of H, the hybrid transformer, is to route incoming speech from the far end xk to the local telephone and route speech from the telephone to the far end. However, the hybrid is never perfect, so its output dk contains both the desired speech from the local telephone plus filtered speech from the far end. The echo canceller is the adaptive filter fk, which attempts to minimize the error signal εk by filtering the incoming far end speech into a replica yk of the far end speech that leaks through the hybrid. Once the adaption is complete, the error signal consists mostly of speech from the local telephone.

Echo suppression and echo cancellation are methods in telephony to improve voice quality by preventing echo from being created or removing it after it is already present. In addition to improving subjective quality, this process increases the capacity achieved through silence suppression by preventing echo from traveling across a network.
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更新时间：2025/6/18 16:51:24