Frequency Response for 16mm Magnetic Sound: A Survey of Test Films

In the development of 16mm magnetic recording, both as a stripe on motion-picture film and as a soundtrack on magnetic film, different techniques in frequency equalization have evolved and different proposals for standardization have been advanced. In practice the differences are observed to be such that rerecording is frequently necessary, and program interchangeability has been hampered. As an essential prerequisite to evaluation of the compromise proposals that have been advanced, a few representative test films have been examined in order to have actual data on how the existing standards are being interpreted, and how closely actual practice adheres to the applicable documents. The range of equalization curves measured on these 16mm test films is sufficiently large that a move toward an acceptable compromise is desirable. Inasmuch as efficient recording media in 16mm format are readily available and there is always the incentive to permit the best possible overall system performance, a 50-μs high frequency aim is proposed for efficient loading of the magnetic medium.

Print ISSN

0361-4573

Published

1971-01

Content type

Original Research

DOI

10.5594/J13541