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ＭＳＡＮＣ是一种新型优化的主从结构自适应噪声对消器，此系统具有两个自适应滤波器，主滤波器和从滤波器。从滤波器用于估计输入信噪比，主滤波器进行真正的自适应滤波。主滤波器的步长是输入信噪比的函数，对这个步长函数的选取，我们根据函数类型考虑了几种不同情况。计算机仿真实验表明，正指数型函数能取得最佳对消效果，是针对于此系统的最优选择。
MSANC is a new type of optimized master-slave adaptive noise canceller with two adaptive filters, a main filter and a slave filter. From the filter used to estimate the input signal to noise ratio, the main filter for true adaptive filtering. The main filter step is a function of the input signal-to-noise ratio. For the selection of this step function, we consider several different cases depending on the type of function. Computer simulation shows that the positive exponential function can achieve the best cancellation effect and is the optimal choice for this system.