INTRODUCTION TO AMPLITUDE MODULATION

Duration: 26 min

Creator: Department of the Air Force (Department of Defense)

Color: B&W

Sound: Optical sound

Description: Gives a brief history of major developments in the communications field to point out why amplitude modulation came into being. Explains how intelligence can be transmitted by amplitude modulating a high frequency wave with an intelligence signal. Defines such terms as modulation, intelligence signal and carrier wave. Discusses a basic block diagram of an AM transmitter to show the method of producing an amplitude modulated wave. (Kinescope)