Adaptive Window Width Selection Algorithm for Gabor Transform Based on Entropy
Du Xiu-li①② Shen Yi② Wang Yan②
①(School of Information Engineering, Dalian University, Dalian 116622, China) ②(School of Astronautics, Harbin Institute of Technology, Harbin 150001, China)
Abstract：To resolve the issue of window width selection, an adaptive algorithm for Gabor transform is proposed, which improves the concentration and time-frequency resolution of Gabor representation. The value range of Shannon entropy is mended to make it more adequate for measuring concentration of time-frequency distribution. Moreover, basing on entropy, an optimal window width can be searched adaptively. Simulation results show that the proposed algorithm chooses the optimal window width for mono-component signal or multi-component signal, giving the best Gabor representation with high concentration and time-frequency resolution. Additionally, the algorithm behaves well under low signal noise ratio.
2008, Vol. 30 
