examp13_1.m

《小波分析理论与Matlab7实现例程》一书里面各章节的源码

clc;
clear;
% 产生包含2^10点的'Heavy sine'信号
x = wnoise(3,10); 
figure(1);
ind = linspace(0,1,2^10); 
subplot(5,1,1),plot(ind,x),title('Heavy sine信号');

% 产生包含2^10点的'Doppler' 信号，信噪比为7
[x,noisyx] = wnoise(4,10,sqrt(7));
subplot(5,1,2),plot(ind,x),title('Doppler信号');
subplot(5,1,3),plot(ind,noisyx),title('含噪声的Doppler信号');

% 产生随机数种子
init = 2055415866; 
[xx,noisyxx] = wnoise(4,10,sqrt(7),init);
subplot(5,1,4),plot(ind,xx),title('由种子产生的Doppler信号');
subplot(5,1,5),plot(ind,noisyxx),title('由种子产生的含噪声的Doppler信号');
% 显示所有的波形
figure(2);
x1 = wnoise(1,10); 
subplot(6,1,1),plot(ind,x1),title('Blocks信号');
x2 = wnoise(2,10); 
subplot(6,1,2),plot(ind,x2),title('Bumps信号');
x3 = wnoise(3,10); 
subplot(6,1,3),plot(ind,x3),title('Heavy sine信号');
x4 = wnoise(4,10); 
subplot(6,1,4),plot(ind,x4),title('Doppler信号');
x5 = wnoise(5,10); 
subplot(6,1,5),plot(ind,x5),title('HQuadchirp信号');
x6 = wnoise(6,10); 
subplot(6,1,6),plot(ind,x6),title('Mishmash信号');