基于改进S变换的语音信号时频分析

英文篇名：Time-frequency Analysis of Speech Signal Based on Improved S Transform
中文刊名：科学技术与工程
英文刊名：Science Technology and Engineering
作者：孙艳 ; 于凤芹
英文作者：SUN Yan ; YU Feng-qin(Communication and Control Engineering Institute ; Jiangnan University ; Wuxi 214122 ; P.R.China)
中文关键词：语音信号 ; 时频分析 ; 改进S变换
英文关键词：speech signal time-frequency analysis improved S transform
出版日期：2010-04-08
机构：江南大学通信与控制工程学院;
年：2010
期：10
出版单位：科学技术与工程

摘要

STFT分辨率固定,小波变换会出现局部相位信息且时间-尺度关系不适合直观视觉分析。提出基于改进S变换的语音信号时频分析。样条小波作为小波变换母小波乘以相位因子得到改进S变换,具有多分辨率和相位因子,并适合直观视觉分析。仿真实验得到的时频分布结构图与STFT、小波变换分布比较,显示改进S变换时频结构更加细致。
STFT has fixed resolution and wavelet transform has a partial phase information and time-scale relations are not suitable for an intuitive visual analysis.Time-frequency analysis of speech signal based on an improved S transform was proposed.Wavelet transform with spline wavelet as the mother wavelet multiplied by the phase factor was the improved S transform,which had multi-resolution and phase factor and was suitable for the intuitive visual analysis.Simulation experiments show the time-frequency structure of the improved S transform is more fine compared with STFT and wavelet transform.

引文

1徐春光.非平稳信号的时频分析与处理方法研究,博士学位论文.西安:西安电子科技大学,1999
    2王殿伟,李言俊,张科.基于S变换的时频特征提取与目标识别.航空学报,2009;30(2):305—310
    3 Stockwell R G,Mansinha L,Lowe R P.Localization of the complexspectrum:theStransform.IEEE Transactions on Signal Processing,1996;44(4):998—1001
    4 Ventosa S,Simon C.TheS-transform from a wavelet point of view.IEEE Transactions on Signal Processing,2008;56(7):2771—2780
    5 Sahu S S,Panda G,George N V.An improvedS-transform for time-frequency analysis.IEEE International Advance Computing Confer-ence,India,2009:315—319
    6陈学华,贺振华.改进的S变换及在地震信号处理中的应用.数据采集与处理,2005;20(4):449—453
    7 Kadambe S.Acomparison of a wavelet functions for pitch detection ofspeech signals.IEEE Acoustics,Speech,and Signal Processing,1991;1:449—452
    8张贤达,保铮.非平稳信号分析与处理.北京:国防工业出版社,1998:272—274