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在机械设备，特别是具有齿轮、滚动轴承的机械设备故障诊断中，广泛使用解调方法分析诊断故障．目前使用的希尔伯特（Ｈｉｌｂｅｒｔ）变换解调方法，特别是宽带解调方法，不但对包含故障信息的时域相乘信号解出调制信号，而且对两时域相加信号，也以频率之差作为调制信号解出；当采用带通滤波来克服这种局限性．并用细化分析来提高解调分析的频率精度时，由于算法的影响会出现调制频率的高次谐波分发生频率混叠而反折到低频部分的混频现象．不论是哪一种情况都会在解调谱上出现引起误诊断或无法分析的频率成分．
In mechanical equipment, especially with gear, rolling bearing mechanical equipment fault diagnosis, demodulation method widely used to analyze the diagnosis of faults. At present, the Hilbert transform demodulation method, especially the wideband demodulation method, not only demodulates the modulated signal in the time-domain multiplication signal containing the fault information, but also adds the signal to the two time-domain signals, The difference is solved as a modulated signal; bandpass filtering is used to overcome this limitation. And refinement analysis to improve the frequency accuracy of demodulation analysis, due to the impact of the algorithm there will be modulation of the frequency of the high frequency harmonic aliasing and folding to the low frequency part of the mixing phenomenon. In any case, the frequency components causing misdiagnosis or analysis can not be analyzed on the demodulation spectrum.