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[交流] 【求助】求助matlab程序

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f_a=(abs(fft(a))).^2;
f_t=(abs(fft(t))).^2;
f_c=(abs(fft(c))).^2;
f_g=(abs(fft(g))).^2;
f_sum=f_a+f_t+f_c+f_g;信号f_sum，请问使用加窗傅里叶变换，如何得到一个二维的谱图（如附件）？哪位能帮忙写下代码？谢谢了！窗口大小为100

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