[C,L]=wavedec(x(1,:),3,'db4','shannon');里面的shannon是小波名吗,还有sh
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[C,L]=wavedec(x(1,:),3,'db4','shannon');里面的shannon是小波名吗,还有shannon entropy 负熵的程序怎编
![[C,L]=wavedec(x(1,:),3,'db4','shannon');里面的shannon是小波名吗,还有sh](/uploads/image/z/7403914-10-4.jpg?t=%5BC%2CL%5D%3Dwavedec%28x%281%2C%3A%29%2C3%2C%27db4%27%2C%27shannon%27%29%3B%E9%87%8C%E9%9D%A2%E7%9A%84shannon%E6%98%AF%E5%B0%8F%E6%B3%A2%E5%90%8D%E5%90%97%2C%E8%BF%98%E6%9C%89sh)
load jzxh.txt
s1=jzxh;
fs=500000; %采样频率
t=1:max(size(s1));
t=1000*t./fs;
t=t';
plot(s1),title('plot(s1)'),grid on;
%axis([0,51.2,-10000,10000]);
xlabel('时间(t) 单位:ms');
ylabel('电压(V)');
title('原始信号');
%小波分解
[c,l]=wavedec(s1,4,'db4');
[cd1,cd2,cd3,cd4]=detcoef(c,l,[1 2 3 4]);
ca4=appcoef(c,l,'db4',4);
a4=wrcoef('a',c,l,'db4',4);
d4=wrcoef('d',c,l,'db4',4);
d3=wrcoef('d',c,l,'db4',3);
d2=wrcoef('d',c,l,'db4',2);
d1=wrcoef('d',c,l,'db4',1);
%不需要的系数置零
caa4=zeros(size(ca4));
%消噪后信号重构,并画图
cl=[caa4',cd4',cd3',cd2',cd1']
s2=waverec(cl,l,'db4');
figure(2);
plot(t,s2);title('消噪后重构信号');grid on;
给你个例子,自己对这改改
s1=jzxh;
fs=500000; %采样频率
t=1:max(size(s1));
t=1000*t./fs;
t=t';
plot(s1),title('plot(s1)'),grid on;
%axis([0,51.2,-10000,10000]);
xlabel('时间(t) 单位:ms');
ylabel('电压(V)');
title('原始信号');
%小波分解
[c,l]=wavedec(s1,4,'db4');
[cd1,cd2,cd3,cd4]=detcoef(c,l,[1 2 3 4]);
ca4=appcoef(c,l,'db4',4);
a4=wrcoef('a',c,l,'db4',4);
d4=wrcoef('d',c,l,'db4',4);
d3=wrcoef('d',c,l,'db4',3);
d2=wrcoef('d',c,l,'db4',2);
d1=wrcoef('d',c,l,'db4',1);
%不需要的系数置零
caa4=zeros(size(ca4));
%消噪后信号重构,并画图
cl=[caa4',cd4',cd3',cd2',cd1']
s2=waverec(cl,l,'db4');
figure(2);
plot(t,s2);title('消噪后重构信号');grid on;
给你个例子,自己对这改改
[C,L]=wavedec(x(1,:),3,'db4','shannon');里面的shannon是小波名吗,还有sh
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