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考虑到扬声器的非线性特性,将实际房间声学系统模拟为一个无记忆非线性系统与一个动态线性系统相级联,并分别采用多项式函数和限幅函数模拟扬声器系统的非线性特性,通过在声回波对消的归一化最小均方算法中引入相应的非线性预处理,改善房间声回波对消的效果。计算机仿真证明,考虑了扬声器非线性影响并在算法中进行相应非线性预处理后的房间声回波对消比未经非线性预处理的声回波对消有更好的对消效果。
Taking into account the nonlinear characteristics of the speaker, the real room acoustic system is simulated as a non-memory nonlinear system cascaded with a dynamic linear system, and the non-linear characteristics of the speaker system are simulated by using polynomial functions and amplitude limiting functions respectively. Echo Cancellation of the normalized least mean square algorithm to introduce the corresponding non-linear preprocessing to improve the effect of room echo cancellation. Computer simulation shows that the room acoustic echo considering the non-linear influence of speakers and the corresponding non-linear preprocessing in the algorithm has a better cancellation effect than the non-linear pre-processing acoustic echo cancellation.