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 #:
000114
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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£ 30 QC 20 300 200 100 0 100 200 300 '400 500 VALVE CURRENT Fig. 4. Predistortion curve for extended range recording. reduction voltage then serves to cancel this d-c bias, the minimum spacing of the ribbon being obtained for maximum signal input. Experience has shown that noise reduction equivalent to that obtained in ordinary recording can be obtained in this method of recording. The shape of the correcting curve was checked by recording signals at various levels and measuring the distortion. The part of the curve that was incorrect was found by measuring the distortion of a low-level signal that was moved in steps, over the complete range of the characteristic, by independently varying the noise-reduction control voltage. This information was used for final in dividual adjustment of each section of the amplifier. It should be noted that the current required from the B supply varies at both the signal envelope and audiofrequency rates. A regulated B voltage supply having a rapid recovery rate and a low internal impedance of about 0.9 ohms was satisfactory. The necessary maintenance, checking and adjustments have been reduced to a routine. We anticipate that experience will produce a system with better uniformity and quality than the negative and positive system. Having developed a nonlinear system with adjustable characteristics, we have adapted it to extend the volume range of the print made from a standard nega O. L. Dupy: Direct-Positive Variable-Density Recording 105