摘要：总体思路就是时域信号减去平均值。 clear,clcclose all x = 0:1/1024:1-1/1024;y = sin(2*pi*10*x) + sin(2*pi*20*x + 0.5*pi); y = y+ 10;z = fft(y);figurestem(-512:511,abs(f 阅读全文