关键词: 实值离散Gabor变换, 时频分辨率, 进化谱

Abstract: The traditional single-window based discrete Gabor transform has a fixed joint time-frequency resolution. Due to the uncertainty principle the time resolution and frequency resolution in the Gabor transform domain have an inverse proportion relationship. In order to improve the joint time-frequency resolution of the traditional discrete Gabor transform and speed up the transform, it presents a multi-Gaussian window based real-valued discrete Gabor transform. The experimental results show that the proposed transform can effectively improve the accuracy of the joint time-frequency resolution, it provides a fast method for the computation of the evolutionary spectrum of the non-stationary signals with the high joint time-frequency resolution.

Key words: real-valued discrete Gabor transform, time-frequency signal analysis, evolutionary spectrum