matlab 实现为电子琴添加泛音

Posted 2022-03-15 胡刚2021

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现在为之前的 matlab 实现简易电子琴添加泛音
其实就是在之前Button回调函数生成的正弦波的基础上，再给它点乘一个元素数量一样多的数组，这个数组的波形是一个包络线，就是下面这个样子，达到的效果就是使得原来的正弦波先上升，再下降，然后保持，最后再下降到0.

修改Button1的回调函数如下

% --- 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
    
    A = linspace(0,0.9,8800);
    D = linspace(0.9,0.8,2200);
    S = linspace(0.8,0.8,18000);
    R = linspace(0.8,0,15100);
    adsr = [A,D,S,R];% A,D,S,R这四个数组的元素个数加起来等于44100
    f1 = y1.*adsr;% 当两个一维数组相乘要使用 .*
    plot(t, f1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(f1, Fs);

就是把原来

plot(t, y1);
axis([0, 0.01, -0.5, 0.5]);
wavplay(y1, Fs);

这三行代码，替换为下面的代码

A = linspace(0,0.9,8800);
D = linspace(0.9,0.8,2200);
S = linspace(0.8,0.8,18000);
R = linspace(0.8,0,15100);
adsr = [A,D,S,R];% A,D,S,R这四个数组的元素个数加起来等于44100
f1 = y1.*adsr;% 当两个一维数组相乘要使用 .*
plot(t, f1);
axis([0, 0.01, -0.5, 0.5]);
wavplay(f1, Fs);

其他Button的回调更改是一模一样的

% --- 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
    
    A = linspace(0,0.9,8800);
    D = linspace(0.9,0.8,2200);
    S = linspace(0.8,0.8,18000);
    R = linspace(0.8,0,15100);
    adsr = [A,D,S,R];% A,D,S,R这四个数组的元素个数加起来等于44100
    f1 = y1.*adsr;% 当两个一维数组相乘要使用 .*
    plot(t, f1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(f1, 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
    
    A = linspace(0,0.9,8800);
    D = linspace(0.9,0.8,2200);
    S = linspace(0.8,0.8,18000);
    R = linspace(0.8,0,15100);
    adsr = [A,D,S,R];% A,D,S,R这四个数组的元素个数加起来等于44100
    f1 = y1.*adsr;% 当两个一维数组相乘要使用 .*
    plot(t, f1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(f1, 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
    
    A = linspace(0,0.9,8800);
    D = linspace(0.9,0.8,2200);
    S = linspace(0.8,0.8,18000);
    R = linspace(0.8,0,15100);
    adsr = [A,D,S,R];% A,D,S,R这四个数组的元素个数加起来等于44100
    f1 = y1.*adsr;% 当两个一维数组相乘要使用 .*
    plot(t, f1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(f1, 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
    
    A = linspace(0,0.9,8800);
    D = linspace(0.9,0.8,2200);
    S = linspace(0.8,0.8,18000);
    R = linspace(0.8,0,15100);
    adsr = [A,D,S,R];% A,D,S,R这四个数组的元素个数加起来等于44100
    f1 = y1.*adsr;% 当两个一维数组相乘要使用 .*
    plot(t, f1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(f1, 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
    
    A = linspace(0,0.9,8800);
    D = linspace(0.9,0.8,2200);
    S = linspace(0.8,0.8,18000);
    R = linspace(0.8,0,15100);
    adsr = [A,D,S,R];% A,D,S,R这四个数组的元素个数加起来等于44100
    f1 = y1.*adsr;% 当两个一维数组相乘要使用 .*
    plot(t, f1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(f1, 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
    
    A = linspace(0,0.9,8800);
    D = linspace(0.9,0.8,2200);
    S = linspace(0.8,0.8,18000);
    R = linspace(0.8,0,15100);
    adsr = [A,D,S,R];% A,D,S,R这四个数组的元素个数加起来等于44100
    f1 = y1.*adsr;% 当两个一维数组相乘要使用 .*
    plot(t, f1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(f1, 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
    
    A = linspace(0,0.9,8800);
    D = linspace(0.9,0.8,2200);
    S = linspace(0.8,0.8,18000);
    R = linspace(0.8,0,15100);
    adsr = [A,D,S,R];% A,D,S,R这四个数组的元素个数加起来等于44100
    f1 = y1.*adsr;% 当两个一维数组相乘要使用 .*
    plot(t, f1);
    axis([0, 0.01, -0.5, 0.5]);
    wavplay(f1, 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
    
    A = linspace(0,0.9,8800);
    D = linspace(0.9,0.8,2200);
    S = linspace(0.8,0.8,18000);
    R = linspace(0.8,0,15100);
    adsr = [A,D,S,R];% A,D,S,R这四个数组的元素个数加起来等于44100
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