2(1/2)谱在直升机声信号特征提取中的应用

摘要

A kind of definition of 4th-order cumulant diagonal slice (FOCDS) is introduced, the excellent advantages of FOCDS's fft transform in cubic phase coupling feature extraction are analyzed, and its estimation method is also described. It is used to extract the features of helicopter acoustic signals, which has cubic phase coupling. The simulation results show that the proposed method can analysis the information of cubic phase coupling, and it also shows that the method is much simpler and computes much faster, additionally, it has the advantage of reducing the Gaussian noise. The processed results of real data validate the efficient of this method.%介绍了四阶累积量对角切片的一种定义,分析了其傅里叶变换(2(1/2)谱)在提取三次相位耦合特征方面的良好性能及其估计方法;将其应用于具有三次相位耦合的直升机声信号特征提取.仿真结果表明,利用该方法能够分析信号的三次相位耦合信息,且具有计算方法简单、运算速度快及良好的抑制高斯噪声的优点.实际的数据处理结果验证了该方法的有效性.