一种修正Gabor谱图的新方法

Novel Modified Gabor Spectrum method

提出了一种修正Gabor谱图的新方法,即通过限制Gabor谱图(GS)的自项支撑区域在Gabor系数所估计的支撑区域,获得了很好的时频表示(TFR)。该方法与GS的方法相比主要具有三个方面的优点:首先,减少了运算量;其次,在尽量保持信号各分量的自项不变的同时,有效去除了交叉项;第三,通过增加计算阶数,提高了时频分辨力和聚集性,克服了GS随着阶数的增加而产生严重的交叉项的缺点。实验结果表明,该方法优于GS的方法,同时与自适应最优核(AOK)的方法相比,也达到了较好的TFR结果。

A novel Modified Gabor Spectrum （MGS） method is proposed.Restricting the auto-term supports of MGS on the supports of Gabor eoeffieients,a good Time-Frequency Representation （TFR） is obtained.Compared with the method of Gabor Spectrum （GS）,the MGS has three merits.First,computation cost is reduced great）y.Second,tbe cross-terms are removed effectively and simultaneously the auto-terms are almost unchanged.Thirdly,the resolution and concentration of time-frequency are improved by high order operation.Compared with the methods of GS and AOK,experimental results show better TFR performance of the MGS.