Question

Why we need to calculate the fourier transform of the signal?

Answer 1

The Fourier Transform is a tool that breaks a waveform (a function or signal) into an alternate representation, characterized by sine and cosines. The Fourier Transform shows that any waveform can be re-written as the sum of sinusoidal functions. If you want to brush up, check the Fourier Transform Properties link.

Hope this helps ☺️☺️