One form of AM stereo signal with stereo message with left and right channels my (t), ma(t) can be written s(t) = Ac[cos(2x fet) + mi(t) cos(2n fet - $) + ma(t) cos(2x fet + $)] $ ~ n/12 (a) (5 points) Find the complex envelope of this AM stereo signal. (b) (3 points) If a standard mono AM receiver with envelope detector is used to receive s(t), then what is the receiver output? 13 (c) (2 points) The desired output of the mono receiver is my(t) + me(t). Show that for o = 150 the output is close to the desired result. (d) (2 points) Why is this method preferred over a method that assigns i(t) = my(t), q(t) = mr(t)