说明：  function X=t2f(x) global dt df N t f T %X=t2f(x) %x为时域的取样值矢量 %X为x的傅氏变换 %X与x长度相同,并为2的整幂。 %本函数需要一个全局变量dt(时域取样间隔) H=fft(x); X=[H(N/2+1:N),H(1:N/2)]*dt; end
(function X=t2f(x) global dt df N t f T %X=t2f(x) %X is the sampled value vector in time domain %Fourier transform with X as X %X is the same length as X and is an integral power of 2. %This function requires a global variable DT (time domain sampling interval) H=fft(x); X=[H(N/2+1:N),H(1:N/2)]*dt; End)