Given the Fourier transform X(f)of x(t) we can obtain the Fourier transform X_s (f)of x_s (t) by translating f_s X(f) by 0,±f_s,±〖2f〗_s,… and adding the translated components together. Example shown below in Figures 2.7 and 2.8 illustrate the sampling operation in the time domain and frequency domain, respectively.