matlab频谱分析怎么做对比答:m1= 2*abs(fftshift(m));p1=2*abs(fftshift(p));l1=2*abs(fftshift(l));spectrumIndex=fs / 2 *linspace(-0.5,0.5,n)*2+f0;subplot(212)plot(spectrumIndex, m1, 'r','LineWidth',1.3)hold on plot(spectrumIndex, l1, 'k','LineWidth',1.3) %频谱图 参考着改改 采样...