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MAGNETIC RECORDING FOR MOTION PICTURE STUDIOS*
WESLEY C. MILLER**
Summary. — Magnetic sound recording systems are being investigated for possible application by the motion picture industry. With limited current literature and the general nature of present industry discussions, certain peculiar requirements for studio use have not been taken into account, but are outlined here. The discussion represents the opinion of one studio's sound department based on the present state of developments and the information at hand, but is, of course, subject to modification as experience and additional information are acquired.
It seems almost certain that some form of the magnetic methods of recording and reproducing sound can have an important value in many phases of motion picture sound recording. That their value can extend to the theater reproduction field as well seems probable but for present purposes no attempt will be made here to evaluate the use in this part of the field.
Many groups are studying magnetic methods but the limited current literature and the discussions in general appear to be directed along lines which, while valuable in themselves, do not take into account certain peculiar requirements which are important to the studio use of recording media in picture production. While a new medium which may be a replacement for film may, because of its nature, require changes in existing technique, nevertheless these existing techniques should be studied to see how much could be salvaged by adapting the new processes to what we have rather than by taking the other point of view of trying to change everything to conform to present known forms of the magnetic medium.
As a starting point, let us make a few assumptions as follows and then see what could be done with the magnetic methods:
(1} Frequency response can be made at least equivalent to that of our present film . This must be qualified by the factors of signal-to-noise ratio and distortion, in other words, high-quality volume range.
* Submitted Jan. 11, 1947. '* Sound Department, Metro-Goldwyn-Mayer Studios, Culver City, Calif.
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