精选优质文档-倾情为你奉上function Spec,Freq=STFT(Sig,nLevel,WinLen,SampFreq)%计算离散信号的短时傅里叶变换；% Sig 待分析信号；% nLevel 频率轴长度划分（默认值512）；% WinLen 汉宁窗长度（默认值 64）；% SampFreq 信号的采样频率 （默认值1）；if (nargin 1), error(At least one parameter required!);end;Sig=real(Sig);SigLen=length(Sig);if (nargin 4), SampFreq=1;endif (nargin 3), WinLen=64;endif (nargin 2), nLevel=513;endnLevel=ceil(nLevel/2)*2+1;WinLen=ceil(WinLen/2)*2+1;WinFun=exp(-6*linspace(-1,1,WinLe
