This document discusses types of amplitude modulation, including single sideband modulation (SSB) and vestigial sideband modulation. It provides details on SSB modulation such as using Hilbert transforms to generate an SSB signal from a baseband signal and information carried in upper and lower sidebands. Methods for generating SSB signals including selective filtering and phase shifting networks are described. The document also discusses vestigial sideband modulation, demodulation of SSB signals, and applications to telephone channel multiplexing.