Fourier Transform The modulation property of the Fourier transform. (a) Let f(t) be a signal, s0 a number, and define g(t) = f(t)cos(2πs0t). Show that Fg(s) = 1 2 Ff(s − s0) + 1 2 Ff(s + s0) (b) Find the signal (in the time domain) whose Fourier transform is pictured, below.