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为减小循环谱密度的计算量以及提高其特征提取的准确性,提出了组合切片法:取循环自相关切片的各峰值频率作循环频率分别计算循环谱密度切片,通过组合切片分析来确定声场信号的特征频率。然后采用循环谱密度取代功率谱密度作为平面近场声全息的重建物理量。实验结果表明,此方法可针对性的提取循环平稳声场的调制特性,全息重建的结果可准确反映噪声源的位置。
In order to reduce the computational complexity of cyclic spectral density and improve the accuracy of its feature extraction, a combined slice method is proposed: taking the peak frequencies of cyclic autocorrelation slices as the cycle frequency to calculate the cyclic spectral density slice respectively, and determining the sound field by combining slice analysis The characteristic frequency of the signal. Then, the cyclic spectral density is substituted for the power spectral density as the reconstructed physical quantity of planar near-field acoustic holography. The experimental results show that this method can extract the modulation characteristics of cyclostationary sound field pertinently, and the result of holographic reconstruction can accurately reflect the position of noise source.