问题
I have a problem with converting amplitude and phase data into the complex form, which is required to perform an IFFT. (inverse fast fourier transform). This is the only data I have.
My frequency range goes from 0.1 to 2.6 and, with 200 samples. I would like to use IFFT to obtain a time signal. How do I convert this magnitude and phase dataset into the complex plane?
I have never used IFFT (Or fft) before, so some helpful insights would be very helpful!
回答1:
Assuming you want the complex representation like this:
a = 3+4i;
magnitude = abs(a);
phase = angle(a);
you should have magnitude = 5, and theta = 0.9273
Now to inverse and obtain back your complex representation, use the formula:
z = magnitude*exp(i*phase)
if all goes correctly, you should have the complex representation back.
来源：https://stackoverflow.com/questions/31922776/how-to-create-the-complex-representation-from-magnitude-and-phase-information-to