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 #:
000216
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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Sept., 1944 RERECORDING CONSOLE, CIRCUITS, AND EQUALIZERS 205 The design of the equalizer units used in the rerecording console shown in Figs. 14 and 15, is an application of the above information . vSix of these units are included in each rerecording console. Their constant B attenuators are designed to have the above-mentioned maximum loss of 8.30 db to make the add and subtract characteristics symmetrical. The reactors employed are tapped and associated with dials on the control panel to allow sweeping of the equalization characteristics throughout the frequency range. Because of the difficulty in securing tapped reactors having sufficient range, each equalizer FIG. 16. Typical "Add" and "Subtract" constant B equalizer characteristics. unit is really 2 units connected in series, one to cover the frequency spectrum below 1000 cps and the other effective above 1000 cps. This is indicated in the pre-set circuit schematic of Fig. 7. The frequency control dials consist of 20 steps, 10 for the lower unit, and 10 for the upper unit. These equalizer units, then, provide 2 degrees of control freedom independent of each other, one to sweep the frequency range, and a second to vary the equalization. Fig. 16 shows samples of the equalization characteristics obtained. REFERENCES 1 LAMBERT, K. B.: "An Improved Mixer Potentiometer," /. Soc. Mot. Pict. Eng., XXXVH (Sept., 1941), p. 283. 2 Motion Picture Sound Engineering, D. Van Nostrand Co., Inc. (New York), 1938.