matlab wavelet bio %Page 395 %生成3个正弦信号 N = 1024; t = 1:N; x1 = sin(3*t); x2 = sin(0.3*t); x3 = sin(0.03*t); %绘制其波形 figure(1); subplot(3,1,1); plot(t,x1,'LineWidth',2); xlabel('时间 t/s'); ylabel('(si