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 #:
000219
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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208 R. GORISCH AND P. G6RLICH Vol 43, No. 3 because the absorption regions of the available dyes overlapped. Later it was tried to place identical tracks in all layers and thus eliminate the defects characteristic of a single-layer soundtrack.3 This consideration led to the suggestion of the black-and-white silver sound track, as described in the beginning. The fact that a color-developed sound track cannot be avoided in certain processes suggested investigations of the expected noise level,4 and also of the sound volume and distortion.6 The results of these investigations do not show that these simplified colored sound tracks are necessarily unsatisfactory. 075 0.5 MAX. TRANSMISSION MIN. TRANSMISSION 700 800 CESIUM OXIDE CELL CS-Sb CELL 1000 my FIG. 2. Transmission of Agfacolor sound track and fog as a function of wave length. The chemical structure of the sound track is immaterial, and the results are. mainly determined by its absorption characteristics in the spectral regions in which the reproducer photoelectric cell is sensitive. The investigation of the question, why the sound volume is low and the noise level high, must start at this place. Fig. 1 shows spectrophotometric curves of Agfacolor sound track made at areas of maximum and minimum densities. The abscissa [Fig. 1 — translator] shows the wave length of the light and the ordinate the corresponding density. The measurement was carried out in 2 steps, first for the visible light and the long-wave ultraviolet, and then for the infrared and the connecting red part of the spectrum. In order to show more clearly the phenomena in sound reproduc