Amplitude (Linear) Modulation Base band and carrier communication, Generation of AM (DSBFC) and its spectrum Instantaneous frequency, Concept of angle modulation, Frequency spectrum Block diagram of AM and FM receivers, Super heterodyne receiver Sources of noise, Types of noise, White noise, Thermal noise, Shot noise Base band systems, Amplitude modulated systems - DSBSC, SSBSC and AM Band limited and time limited signals, Narrow band signals and systems