The Hilbert–Huang method is presented with modifications, for time-frequency analysis of distorted power quality signals. The empirical mode decomposition (EMD) is enhanced with masking signals based on fast Fourier transform (FFT), for separat

求地震数据的瞬时频率，瞬时振幅，瞬时相位的程序，对研究地球物理三瞬的同学很有帮助-The instantaneous frequency, instantaneous amplitude, and instantaneous phase of the seismic data are helpful for the study of geophysics.