This document discusses frequency modulation (FM) generation and demodulation. It describes how FM can be generated by varying the capacitance in an LC oscillator circuit using a varactor diode, causing the oscillator frequency to vary with the modulating signal. It also discusses Armstrong's indirect method of generating FM by combining a DSB-SC signal with a quadrature carrier. Frequency multiplication is described as a way to increase the frequency deviation of an FM signal. Demodulation of FM signals is also briefly mentioned.