4.13-2 Keep the same m1(t) and fc = 500 Hz in Problem 4.13-1. Following the example in Section 4.12.2, numerically generate the following figures: (a) Conventional AM signal s(t) =[1.2+m¡

(t)]cos 2nfct in time domain. (b) Signal s(t) in (a) rectified without local carrier in time domain. (c) Envelope detector output in time domain.