[C,L]=wavedec(x(1,:),3,'db4','shannon');里面的shannon是小波名吗,还有sh

load jzxh。txts1=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