%x小波變換繪制信號時頻圖
clear?all
clc?
close?all
%%%%%%　小波變換　%%%%%%%%%%%%%%%%?
fs=1024;?
t=1/fs:1/fs:1;?
f1=100;
f2=200;
f3=300;?
s=cos（2*pi*f1*t.*（t>=0&t<0.3））+2*cos（2*pi*f2*t.*（t>=0.3&t<0.8））+3*sin（2*pi*f3*t.*（t>=0.8&t<=1））;?
figure
subplot（211）?
plot（ts‘b‘）;
title（‘原始單頻信號‘）?
%%%%%%%%%%%%%%%%%%%%%%%?小波時頻圖繪制?%%%%%%%%%%%%%%%%%%%%%?
wavename=‘cmor4-4‘;%%選用帶寬參數(shù)和中心頻率均為4?的復(fù)morlet小波?
totalscal=256;%尺度序列的長度，即scal的長度
f