通过Matlab GUI读取音频文件

Question

    % --- Executes on button press in pushbutton1. function pushbutton1_Callback(hObject, ventdata, handles)
    % hObject    handle to pushbutton1 (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    [filename pathname] = uigetfile({'*.wav'}, 'Select File');
    fullpathname = strcat (pathname, filename);
    audio = wavread(fullpathname);


    % --- Executes on button press in pushbutton2.function pushbutton2_Callback(hObject, eventdata, handles)
    % hObject    handle to pushbutton2 (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)

    % get a section of vowel
    [x,fs]=wavread('audio',[24120 25930]);    
    ms20=fs/50; % minimum speech Fx at 50Hz

    % plot waveform
    t=(0:length(x)-1)/fs; % times of sampling instants
    subplot(2,1,1);
    plot(t,x);
    legend('Waveform');
    xlabel('Time (s)');
    ylabel('Amplitude');

    [x,fs]=wavread('audio',[24120 25930]);  

另外，在绘制图形时，我如何使图形出现在GUI上？

Answer 1

Wavread将文件名作为第一个参数。由于audio不是当前路径中的文件（或者可能不是您想要的文件），因此不能将其作为第一个参数。

但是变量audio保存信号本身，因此您不再需要访问文件本身。然后，同时初始化fs:

[audio,fs] = wavread(fullpathname);

然后，如果你需要接收信号的一部分，只需获取其中的一部分：

x = audio(24120 25930);