Demodulation analysis is widely used for diagnosing machine fault diagnosis. Extracting information from modulation signal is an effective method to diagnose damaging faults fixed with gears and bearings.
解调分析技术在具有齿轮、滚动轴承等零件的机械设备故障诊断中具有非常广泛的应用，已成为故障振动信号分析的最有效手段之一。
参考来源 - 信号处理中的解调分析技术及齿轮箱典型故障特征的提取·2,447,543篇论文数据，部分数据来源于NoteExpress
一种方法是时延自相关解调分析。
提高了解调分析的速度和精度，克服了希尔伯特变换应用的局限性。
The speed and accuracy of demodulation analysis are improved greatly, and the limitation of Hilbert alternation is overcome.
利用希尔伯特变换解调分析各频带信号，得到对应频带信号的包络谱；
The reconstruction signals were demodulated with Hilbert transform, and envelope spectrum at each band was obtained.
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