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发明授权
CN1672341B 通信系统及其方法 失效 - 权利终止

通信系统及其方法
摘要：
公开一种具有回波消除器(20)的通信系统(10)。回波消除器的一个实施例包括用于估计从发送的信号中消除的反射回波的估计量的自适应滤波器(28)。回波消除器还可包括用于当存在近端谈话者信号时，防止自适应滤波器自适应的近端谈话者信号检测器(26)。回波消除器还可包括进一步减少任意残留回波，并保持背景噪声的非线性处理器(32)。回波消除器还可包括用于监视自适应滤波器的滤波器系数和增益，以保持回波消除器的稳定性，估计纯延迟，检测音调和注入训练信号(41)的监视和控制单元(30)。回波消除器还可包括用于减小自适应滤波器的长度的非自适应滤波器(31)。
摘要（英）：

A communication system (10) having an echo canceller (20) is disclosed. One embodiment of the echo canceller includes an adaptive filter (28) used to provide an estimate of reflected echo which is removed from the send signal. The echo canceller may also include a near-end talker signal detector (26) which may be used to prevent the adaptive filter from adapting when a near-end talker signal is present. The echo canceller may also include a nonlinear processor (32) used to further reduce any residual echo and to preserve background noise. The echo canceller may also include a monitor and control unit (30) which may be used to monitor the filter coefficients and gain of the adaptive filter to maintain stability of the echo canceller, estimate pure delay, detect a tone, and inject a training signal (41). The echo canceller may also include a nonadaptive filter (31) used to reduce the length of the adaptive filter.

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