利用小波分解信号，再重构(matlab代码)

function [ output_args ] = example4_5( input_args ) %EXAMPLE4_5 Summary of this function goes here % Detailed explanation goes here clc; clear; load leleccum; s = leleccum(1:3920); % 进行3层小波分解，小波基函数为'db2' [c,l] = wavedec(s,3,'db2'); %进行小波重构 rs= waverec(c,l,'db2'); figure(1) subplot(211) plot(s);title('原始信号'); subplot(212) plot(rs);title('重构信号'); %计算重构的误差 erro=norm(s-rs) end

function [ output_args ] = example4_11( input_args ) %EXAMPLE4_11 Summary of this function goes here % Detailed explanation goes here clc; clear; load noisdopp; x = noisdopp; T = wpdec(x,3,'db1','shannon'); X=wprcoef(T,[2,1]); figure(1) subplot(211) plot(x);title('原始信号'); xlim([0 length(x)]); subplot(212) plot(X);title('小波包[2,1]系数的重构信号'); xlim([0 length(X)]); end