In an amplitude modulation system, the baseband signal is m(t) = A cos(2-f1t) + A, cos (2xf24) ) (1) where A = 1. Az = 0.7, f1 = 1000H: 12 = 2000H:. The carrier signal is c(t) = A.cos(2#f.) (2) where A = 1, fe= 17KH. The AM signal is then s(t) = A (1 + K m(t)) cos(2-ft) (3) (1) Using Matlab, please plot the baseband signal, the carrier signal, and the AM signal. (2) What condition does the K. need to satisfy to avoid over-modulation? 1 Note 1: There should be at least 200 samples per period for the highest frequency component. Note 2: Provide a few examples to show the cases of without over-modulation with over-modulation on the edge between over-modulation and no over-modulation