matlab 实现简易电子琴

Posted 2022-03-15 胡刚2021

1.创建项目

2.布局控件

布局如下

3.添加各个Button的回调函数

function pushbutton1_Callback(hObject, eventdata, handles)
    Fs = 44100;%采样率为44100hz
    T = 1;%时间为1秒
    dt = 1.0 / Fs;%step为 1.0/44100
    N = T / dt;%数组元素的个数为 T/dt
    t = linspace(0, T, N);%生成一个数组[0, 1.0/44100, 2.0/44100,...,44099.0/44100, 1.0]
    y1 = 0.3*sin(2*pi* 247 *t);%生成频率为247hz，幅度为0.3，时间为1秒的正弦波
    plot(t, y1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(y1, Fs);

运行结果，按下1会先播放1秒的声音，然后显示出波形

同理，Button2-9的回调函数中只需要分别改变频率为
262，294，330，349，392，440，494，523

各个Button回调函数如下

% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
    Fs = 44100;%采样率为44100hz
    T = 1;%时间为1秒
    dt = 1.0 / Fs;%step为 1.0/44100
    N = T / dt;%数组元素的个数为 T/dt
    t = linspace(0, T, N);%生成一个数组[0, 1.0/44100, 2.0/44100,...,44099.0/44100, 1.0]
    y1 = 0.3*sin(2*pi* 247 *t);%生成频率为247hz，幅度为0.3，时间为1秒的正弦波
    plot(t, y1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(y1, Fs);


% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
    Fs = 44100;%采样率为44100hz
    T = 1;%时间为1秒
    dt = 1.0 / Fs;%step为 1.0/44100
    N = T / dt;%数组元素的个数为 T/dt
    t = linspace(0, T, N);%生成一个数组[0, 1.0/44100, 2.0/44100,...,44099.0/44100, 1.0]
    y1 = 0.3*sin(2*pi* 262 *t);%生成频率为262hz，幅度为0.3，时间为1秒的正弦波
    plot(t, y1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(y1, Fs);


% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
    Fs = 44100;%采样率为44100hz
    T = 1;%时间为1秒
    dt = 1.0 / Fs;%step为 1.0/44100
    N = T / dt;%数组元素的个数为 T/dt
    t = linspace(0, T, N);%生成一个数组[0, 1.0/44100, 2.0/44100,...,44099.0/44100, 1.0]
    y1 = 0.3*sin(2*pi* 294 *t);%生成频率为294hz，幅度为0.3，时间为1秒的正弦波
    plot(t, y1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(y1, Fs);


% --- Executes on button press in pushbutton4.
function pushbutton4_Callback(hObject, eventdata, handles)
    Fs = 44100;%采样率为44100hz
    T = 1;%时间为1秒
    dt = 1.0 / Fs;%step为 1.0/44100
    N = T / dt;%数组元素的个数为 T/dt
    t = linspace(0, T, N);%生成一个数组[0, 1.0/44100, 2.0/44100,...,44099.0/44100, 1.0]
    y1 = 0.3*sin(2*pi* 330 *t);%生成频率为330hz，幅度为0.3，时间为1秒的正弦波
    plot(t, y1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(y1, Fs);


% --- Executes on button press in pushbutton5.
function pushbutton5_Callback(hObject, eventdata, handles)
    Fs = 44100;%采样率为44100hz
    T = 1;%时间为1秒
    dt = 1.0 / Fs;%step为 1.0/44100
    N = T / dt;%数组元素的个数为 T/dt
    t = linspace(0, T, N);%生成一个数组[0, 1.0/44100, 2.0/44100,...,44099.0/44100, 1.0]
    y1 = 0.3*sin(2*pi* 349 *t);%生成频率为349hz，幅度为0.3，时间为1秒的正弦波
    plot(t, y1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(y1, Fs);


% --- Executes on button press in pushbutton6.
function pushbutton6_Callback(hObject, eventdata, handles)
    Fs = 44100;%采样率为44100hz
    T = 1;%时间为1秒
    dt = 1.0 / Fs;%step为 1.0/44100
    N = T / dt;%数组元素的个数为 T/dt
    t = linspace(0, T, N);%生成一个数组[0, 1.0/44100, 2.0/44100,...,44099.0/44100, 1.0]
    y1 = 0.3*sin(2*pi* 392 *t);%生成频率为392hz，幅度为0.3，时间为1秒的正弦波
    plot(t, y1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(y1, Fs);


% --- Executes on button press in pushbutton7.
function pushbutton7_Callback(hObject, eventdata, handles)
    Fs = 44100;%采样率为44100hz
    T = 1;%时间为1秒
    dt = 1.0 / Fs;%step为 1.0/44100
    N = T / dt;%数组元素的个数为 T/dt
    t = linspace(0, T, N);%生成一个数组[0, 1.0/44100, 2.0/44100,...,44099.0/44100, 1.0]
    y1 = 0.3*sin(2*pi* 440 *t);%生成频率为440hz，幅度为0.3，时间为1秒的正弦波
    plot(t, y1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(y1, Fs);


% --- Executes on button press in pushbutton8.
function pushbutton8_Callback(hObject, eventdata, handles)
    Fs = 44100;%采样率为44100hz
    T = 1;%时间为1秒
    dt = 1.0 / Fs;%step为 1.0/44100
    N = T / dt;%数组元素的个数为 T/dt
    t = linspace(0, T, N);%生成一个数组[0, 1.0/44100, 2.0/44100,...,44099.0/44100, 1.0]
    y1 = 0.3*sin(2*pi* 494 *t);%生成频率为494hz，幅度为0.3，时间为1秒的正弦波
    plot(t, y1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(y1, Fs);


% --- Executes on button press in pushbutton9.
function pushbutton9_Callback(hObject, eventdata, handles)
    Fs = 44100;%采样率为44100hz
    T = 1;%时间为1秒
    dt = 1.0 / Fs;%step为 1.0/44100
    N = T / dt;%数组元素的个数为 T/dt
    t = linspace(0, T, N);%生成一个数组[0, 1.0/44100, 2.0/44100,...,44099.0/44100, 1.0]
    y1 = 0.3*sin(2*pi* 523 *t);%生成频率为523hz，幅度为0.3，时间为1秒的正弦波
    plot(t, y1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(y1, Fs);