Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000505
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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500 O. K. KOLB November more output and, in addition, an increased top response. Curve C refers to a Continental sample of magnetic film from which it will be seen that the output signal strength is down 2 db compared with the British film while a poorer top response is also exhibited. Compensation for the differences in output and top response can, of course, be made in the playback amplifier but at the cost of increased background noise in the case where considerable boosting in the higher audio range is required. PLAYBACK I HEAD Fig. 4. Block diagram of magnetic sound film system. General Circuit Arrangement Once the required magnetic film stock had been obtained and its characteristics and response curve ascertained the next step was to provide the necessary apparatus for actually recording and reproducing sound magnetically. As the same or even better results must be expected from the new magnetic system as from the well-established photographic sound channels, it was an obvious step to adapt existing photographic sound apparatus to the new system, the main difference being that the optics and provision for optical adjustments are eliminated and replaced by a magnetic head consisting of a coil having an annular core of soft magnetic material with a well-defined gap.