Now I'm trying to digging the DFT function. But nobody tell about the what do we need it at least to solve the dft from the complex signal- a signal with many frequencies
If I got the complex signal as the below,
then what should we have to know at the first time to do DFT? Especially, What kind of things should I have to know to solve a signal with many frequencies?
I've seen some parameter from example as the below when I googling. sampling rate, N, nyquist rate, ..., sort of things. In the practically field for engineer, if they got a that kind signal, how do they do at the first time?
then how do we decide the "N" and "m"?