绘制如下锯齿波并给出它的时域波形和频谱图。

Answer 1

[Jiahao CHANG]

Hi 文杰，

关于实现您的问题的代码如下

T = 4;                % Sampling period       
Fs = 1/T;             % Sampling frequency                    
L = 1500;             % Length of signal
t = (0:L-1)*T/L;        % Time vector

y2 = 2*t(1:find(t==1));
y2 = [y2,4-2*t(find(t==1)+1:find(t==3))];
y2 = [y2,2*t(find(t==3)+1:end)-8];
ff = fft(y2);
f = Fs*(0:L-1)/L;
figure
subplot(2,1,1);
plot(t,y2);
subplot(2,1,2);
stem(f,ff);

关于这一问题我建议您使用matlab的help命令搜索fft来获取快速傅里叶变换相关的命令及例子以便更好地完成您这边的任务。

祝您学业有成。

Jiahao CHANG