中文说明：
小波包分析提取振动信号中的特征频率，含噪脉冲信号进行相关检测,包括调制，解调，信噪比计算。
English Description：
The characteristic frequency of vibration signal is extracted by wavelet packet analysis, and the correlation detection of noisy pulse signal is carried out, including modulation, demodulation and SNR calculation.