Abstract
MATLAB software have played a important roles in a wide range of applications。The digital signal processing has become very simple、intuitive in the light of The spectrum analysis and design of the filter features。 In this paper, based on the time-frequency analysis of some basic theory and application，a time and frequency structure of the density function is introduced to reveal signals contained in the frequency components and evolution of the distribution wigner-ille。
Keywords: Time-frequency analysis wigner-ille distribution matlab analytical signal
