Magnetic Recording

Magnetic Recording Varying magnetic patterns, which correspond to sound waves, can be imposed on a moving magnetizable surface. Such patterns can be played back and the magnetic patterns can be read and transduced to sound waves. This principle, which underlies all modern tape recording systems, was discovered independently by several 19th-century inventors. Thomas Edison, while working on the cylinder phonograph in the late 1870s, observed that it would be possible to magnetize indented tracks…