Two smoothed gradient estimate methods used in adaptive sign algorithm applied to adaptive echo canceling have been discussed in this paper.
以自适应回波对消为对象，讨论了两种自适应符号算法的梯度估计平滑方法。
The results show that: (1) In order to improve the effect of adaptive filtering in acoustic echo canceling, the important path is to adopt new hardware and new algorithm.
回波消除中的自适应滤波研究结果表明：（1）由于受到硬件和自适应算法本身的制约，要从根本上提高回波消除中自适应滤波效果，选用新的硬件和新的算法是重要途径。
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