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A Building-Block Approach to Magnetic Recording Equipment Design
By KURT SINGER and J. L. PETTUS
The requirements of magnetic recording equipment for sound motion pictures have been found to vary greatly with different customers. In order to provide the necessary flexibility to meet these different requirements and to include various custom features, the functional units of a magnetic recording channel have been designed on separate rack-mounted panels which can be installed in varying arrangements in a standard amplifier rack. These include items for both single-track and three-track equipments, and film widths of 16mm, 17. /mm and 35mm.
T,
HE EQUIPMENT required for a sound recording plant varies widely depending on the type of recording, the size of the associated studio, and the magnitude of the plant operation. In this respect magnetic recording or reproducing equipment differs in considerable detail over its predecessor, photographic recording and reproducing equipment.
i In the latter case, certain facilities were necessarily reserved for photographic
f film handling. These included dark rooms, film magazines and lighttight enclosures in the recording facilities. In contrast, magnetic equipment offers some consolidation in plant layout as well as certain conveniences in operation.
Presented on October 18, 1951, at the Society's Convention at Hollywood, Calif., by Kurt Singer and J. L. Pettus, Radio Corporation of America, RCA Victor Div., Engineering Products Dept., 1560 N. Vine St., Hollywood 28, Calif.
The requirements of magnetic recording/reproducing equipment for sound motion pictures have been found to vary greatly with different installations. These requirements plus the fact that many studios will wish to install minimum equipment at the beginning and "grow" with the development of magnetic recording, led the authors to the conclusion that studio equipment should be made of carefully planned units so coordinated that they could be easily fitted together to provide almost any desired combination of equipment layout. This is essentially the "building block" idea which is today employed in many types of industrial apparatus. Thus, when expanding a system such as from a few magnetic recording channels to a more comprehensive system or from a single-track to a triple-track recorder/reproducer, it is not necessary to add entirely new recorder mechanisms but rather to increase the number of compo
October 1952 Journal of the SMPTE Vol. 59
319