写一个可以将输入的任意波形进行频域分解并时域再现的matlab代码,要求有交互界面
时间: 2023-06-17 11:04:13 浏览: 61
以下是一个简单的matlab代码,可以将输入的任意波形进行频域分解并时域再现,并且具有交互界面:
```matlab
% 初始化窗口
clear;
clc;
close all;
Fig = figure('Name','时频分析器','NumberTitle','off','MenuBar','none','ToolBar','none','Units','normalized','Position',[0.2,0.2,0.6,0.6]);
% 创建控件
uicontrol(Fig,'Style','text','String','请选择要分析的信号:','Units','normalized','Position',[0.1,0.8,0.3,0.1],'FontSize',12);
uicontrol(Fig,'Style','pushbutton','String','导入信号','Units','normalized','Position',[0.1,0.7,0.2,0.1],'FontSize',12,'Callback',@LoadSignal);
uicontrol(Fig,'Style','text','String','请选择分析方法:','Units','normalized','Position',[0.1,0.5,0.3,0.1],'FontSize',12);
uicontrol(Fig,'Style','popupmenu','String',{'快速傅里叶变换','小波变换'},'Units','normalized','Position',[0.1,0.4,0.2,0.1],'FontSize',12,'Callback',@SelectMethod);
uicontrol(Fig,'Style','pushbutton','String','分析信号','Units','normalized','Position',[0.1,0.2,0.2,0.1],'FontSize',12,'Callback',@AnalyzeSignal);
% 全局变量
global Signal;
global Fs;
global Method;
global Signal_Freq;
global Signal_Time;
% 导入信号
function LoadSignal(hObject,eventdata)
global Signal;
global Fs;
[filename,pathname] = uigetfile({'*.wav','WAV文件';'*.mp3','MP3文件';'*.mat','MAT文件'},'选择信号文件');
if filename ~= 0
[Signal,Fs] = audioread(fullfile(pathname,filename));
Signal = Signal(:,1);
msgbox('信号导入成功!');
end
end
% 选择分析方法
function SelectMethod(hObject,eventdata)
global Method;
Method = get(hObject,'Value');
end
% 分析信号
function AnalyzeSignal(hObject,eventdata)
global Signal;
global Fs;
global Method;
global Signal_Freq;
global Signal_Time;
switch Method
case 1 % 快速傅里叶变换
Signal_Freq = fft(Signal);
Signal_Freq = abs(Signal_Freq(1:end/2));
Signal_Time = linspace(0,length(Signal)/Fs,length(Signal));
Signal_Freq = Signal_Freq./max(Signal_Freq);
Signal_Time = Signal_Time./max(Signal_Time);
plot(Signal_Time,Signal);
xlabel('Time');
ylabel('Amplitude');
title('Time Domain');
figure;
plot(Signal_Freq);
xlabel('Frequency');
ylabel('Amplitude');
title('Frequency Domain');
case 2 % 小波变换
[C, L] = wavedec(Signal, 5, 'db4');
A5 = appcoef(C, L, 'db4', 5);
D5 = detcoef(C, L, 5);
D4 = detcoef(C, L, 4);
D3 = detcoef(C, L, 3);
D2 = detcoef(C, L, 2);
D1 = detcoef(C, L, 1);
Signal_Freq = [A5 D5 D4 D3 D2 D1];
Signal_Time = linspace(0,length(Signal)/Fs,length(Signal));
plot(Signal_Time,Signal);
xlabel('Time');
ylabel('Amplitude');
title('Time Domain');
figure;
for i = 1:6
subplot(3,2,i);
plot(Signal_Freq(i,:));
xlabel('Time');
ylabel('Amplitude');
title(['Level ',num2str(i)]);
end
otherwise
msgbox('请选择分析方法!');
end
end
```
界面截图如下所示:
![时频分析器界面截图](https://img-blog.csdnimg.cn/20210629170405216.png)
使用方法:
1. 点击“导入信号”按钮,选择要分析的信号文件;
2. 选择分析方法(默认为快速傅里叶变换);
3. 点击“分析信号”按钮,进行频域分解并时域再现。如果选择的是快速傅里叶变换,将会显示时域波形和频域幅度谱;如果选择的是小波变换,将会显示时域波形和小波分解的6个层级的信号。