A comb-filter and envelope-demodulation method based on combined Morlet wavelets
Tao Zhang · Journal of Central South University(Science and Technology) · 2006
Based on combined Morlet wavelets,a comb-filter and envelope-demodulation method was presented.Comb-filter belongs to narrowband-pass filters which only pass fault modulating signal.It is more useful to suppress the noise than a broadband filter.And the calculation of wavelet transform is simple.By adjusting the parameters of wavelet,an ideal filter can be attained which can adapt to diverse detecting object.As real parts and imaginary parts of Morlet combined wavelet are 0° phase-shifting filter and 90° phase-shifting filter,the fault characteristic information can be demodulated directly from the output signal of wavelet transform.The feasibility and validity of the method have been validated by the engineering application.