This is an introduction to principles of physics which are applied to audio and video systems. The course deals with basic phenomena in audio and video systems; it gives a broad perspective of the field and it builds up to the latest developments. In particular it discusses wave phenomena, loudspeakers, radio and satellite broadcasting, antennas, fundamentals of electricity, magnetism and electro-magnetism. Analog and Digital recording and playback are discussed. Performance and limitations of audio-video equipment are examined and new developments are presented.  This is a course which presents the how and the why of audio and video.           Exciting demonstrations are used in lectures to explain principles. The course also has labs to illustrate the principles at work in audio and video systems. They  cover Complex Waves, Speaker Characteristics, Component Frequency Response, Radios, Magnetic Recording, and Digital Recording. The class is offered in Fall and Spring semesters. See syllabus.