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This lecture covers the fundamentals of angle modulation, including phase sensitivity factor, instantaneous phase, and generalized angle modulation. It also delves into frequency modulation concepts, maximum frequency deviation, and essential bandwidth calculations for FM signals. Practical considerations such as heterodyne demodulation, modulation types, and bandwidth analysis are discussed. The lecture concludes with a focus on pulse amplitude modulation (PAM), sampling and holding techniques, and ideal low pass filtering for signal reconstruction.