With auto-powerspectrum and cepstrum, this paper diagnoses the unusual noise source of the gear box, and finds an impaired gear of the box.
本文采用自功率谱、逆频谱方法对拖拉机变速箱异常噪声源进行了诊断，找出了产生异常噪声的根源。
2
Using frequency spectrum analysis of phase function to calculate its autopowerspectrum can reflect its frequency structure.
利用相函数的频谱分析求其自功率谱，可以反映它的频率结构。
3
The autopowerspectrum of phase function commonly has two extreme frequencies, and the corresponding frequency components decide the peak characteristics of phase function.