...字信号处理器；FxLMS算法 [gap=706]Key words：helicopters；active noise control；adaptive filtering；DSP；FxLMS algorithm ...
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FXLMS adaptive algorithm FXLMS自适应算法
In active noise control (ANC), the FXLMS algorithm has been widely used for its simplicity and low computational load.
自适应噪声主动控制(ANC)中，由于FXLMS算法较为简单、计算量较小，使之得到广泛应用。
In the feedforward ANC, when the traditional FXLMS algorithm is applied directly, non-minimum phase(NMP) of the secondary-path transfer function will lead to the performance degradation.
在前馈有源噪声控制中，由于次级通道传递函数往往是非最小相位系统，直接使用传统的FXLMS算法时，导致系统的性能下降。
But if above positive real condition is satisfied only within some frequency range, the convergence of FXLMS algorithm is dependent on the spreading of power spectral density of the reference signal.
若上述正实条件仅在某些频带上满足，则FXLMS算法的收敛将依赖于参考信号功率谱密度的分布。
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