基于有限长序列分析的Welch法谱估计研究  

Research on Spectral Estimation Using Welch Method Based on Analysis of Finite-length Sequence

作　　者：沈志远[1] 王黎明[1] 陈方林[1] 

机构地区：[1]中北大学电子测试技术国家重点实验室,山西太原030051

出　　处：《计算机仿真》2010年第12期391-395,共5页Computer Simulation

摘　　要：研究功率谱估计,为提高谱的性能,Welch法是经典谱估计中性能较好且在实践中得到广泛应用的方法。通过分析影响有限长序列傅里叶变换性能的因素(包括离散傅里叶变换的长度和窗函数类型及其长度),根据上述因素对Welch法谱估计性能的影响,得到参数选择的一般原则,为实验参数选择提供依据。用仿真信号以及实际语音信号进行仿真分析,实验结果表明,Welch参数选择方法可以得到较理想的谱估计性能。Welch method has better performance and is widely used in the classic spectral estimation.Through studying the factors how to affect Fourier transform of finite-length sequen￣ce,the factors that influence the performance of spectral estimation using Welch method is analyz￣ed in this paper,and its general principles of parameter selection can be obtained,which will provide a theoretical basis for parameter selection in practice.These factors include the length of discrete Fourier transform,window function and its length.Results of the simulation signal and the actual speech signal show that the more satisfactory spectral estimation can be obtained from the Welch method according to the parameter selection method proposed in this paper.

关 键 词：有限长序列 谱估计 窗函数 语音信号 

分 类 号：TN911.72[电子电信—通信与信息系统]