为何spectrogram输出有多种颜色的分量

N = 1024; n01 = randn(1,1024); n02 = randn(1,512); n03 = randn(1,512); sig=anabpsk(N,50,0.25); sig2=anabpsk(N,50,0.25); y = awgn(sig,snr); y2 = awgn(sig2,snr); sig_contac = [n01 y’ n02 y2’ n03]’; [S,F

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