4.13-5 Consider the message signal m¡ (1) in Problem 4.13-1 and carrier frequency fc=400 Hz. Follow the example in Section 4.12.5 to generate the following signals: (a) FM modulation signal

with kf = 50 n in time domain and frequency domain. (b) Derivative of the FM signal and the rectified FM derivative in time domain. (c) Envelope detection output for FM demodulation in time domain.