自适应时频分布快速实现与仿真  

Fast Implementation and Simulation of Adaptive Time-frequency Distribution

作　　者：杨洪[1] 王海滨[1] 孙树平[2] 胡德宇[1] 

机构地区：[1]西华大学电气信息学院,四川成都610039 [2]日本山口大学工学院

出　　处：《计算机仿真》2011年第2期383-387,共5页Computer Simulation

基　　金：西华大学学科建设项目"医学信息实构建"(XZD0702-2);四川省教育厅科研项目申报书"基于听诊器的实验研究"(09209025)

摘　　要：针对广义时频分布存在的核函数参数非单一性和交叉项干扰严重,使部分频率成份丢失和运算速度慢等技术难点。为解决上述问题,研究了一种具有单一可控核参数T的自适应锥形核广义时频分布。根据其原理表达式结果,提出利于程序运行速度的数组间递推关系运算、采用数值逼近原则。在以MATLAB为平台,通过对典型非平稳信号进行几种典型时频分析方法的对比分析,结果表明,基于快速算法的自适应锥形核广义时频分布具有高效的运行速度、具有良好的时频分布效果,是一种具有优良性能的时频分析方法。Aim at the technical difficulties of non-single character of kernel parameters,serious cross-term interference,the loss of part of frequency component and slow operational speed of general time-frequency distribution.Studied on an adaptive cone kernel general time-frequency distribution with a single controllable parameter T.In view of the results of principle expression,a fast operation method is proposed using recurrence relations operation between the arrays,which is beneficial to program running,and the principles of numerical approximation and simple functional replacing complexity of the analysis results are used to reduce calculated quantities.Simulations were carried out with MATLAB,by analyzing typical non-stationary signals using several typical time-frequency analysis methods,the results showed that adaptive cone kernel general time-frequency distribution based on the fast algorithm has high-performance speed,good effect of time-frequency distribution,character for overcoming the main disadvantage of common generalized time-frequency distribution,and is a time-frequency analysis method with excellent performance.

关 键 词：自适应 广义时频分布 非平稳信号 交叉项 

分 类 号：TN911.6[电子电信—通信与信息系统]