1. A time domain signal analysis method, comprising: receiving a signal to be analyzed; iteratively sifting the signal to be analyzed by using empirical mode decomposition (EMD) to extract at least one intrinsic mode function (IMF); performing a normalized Hilbert transform on the at least one IMF, wherein the transformed at least one IMF comprises phase information; and processing the transformed at least one IMF by means of phase processing to obtain the at least one IMF comprising angular frequency information.