Recent Developments in Magnetic Recording for Motion Picture Film
Marvin Camras · The Journal of the Acoustical Society of America · 1947
Magnetic recording gives an ideal sound system for use in motion picture work. Equipment for making the record is light, simple, and inexpensive. The material can be edited by “cutting,” or by erasing and re-recording. Sound can also be added after the pictures are complete. Conventional projectors are used with the magnetic system. Response comparable to optical recording is obtained with low distortion and noise. Recording heads, circuits, and mechanical drives for use with various systems are described.