基于多高斯窗的实值离散Gabor变换  

Multi-Gaussian window based real-value discrete Gabor transform

作　　者：李锐[1] 陶亮[1] 

机构地区：[1]安徽大学计算智能与信号处理教育部重点实验室,合肥230039

出　　处：《计算机工程与应用》2013年第5期210-212,240,共4页Computer Engineering and Applications

基　　金：国家自然科学基金(No.61071169);安徽大学创新研究项目(No.yqh090053)

摘　　要：传统的单窗复值离散Gabor变换具有固定的时频分辨率,由于受窗函数时宽-带宽之间的制约关系,即不确定性原理限制,其时间分辨率和频率分辨率是矛盾的关系。为了改善传统离散Gabor变换时频分辨率并加快其变换速度,提出了一种基于多高斯窗的实值离散Gabor变换,实验结果表明能有效改善联合时频域内的聚集性,从而提供了一种快捷地计算非平稳信号进化谱方法。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 rela- tionship. 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.

关 键 词：实值离散GABOR变换 时频分辨率 进化谱 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]