Application on technique of joint time-frequency analysis of seismic signal filtering

Joint time-frequency analysis is conducted to construct one joint density function of time and frequency. It can open out one signal's frequency components and their evolvements. It is the new evolvement of Fourier analysis. In this paper, according to the characteristic of seismic signal, one time-variant filtering method based on short-time Fourier transform is introduced, and the results of experiment and conclusion are presented. (authors)