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 #:
000669
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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652 ELLSWORTH D. COOK [J. S. M. p. E. tion to one another and new frequencies are introduced. This is easily seen by analyzing the envelope curve of Fig. 1 in Fourier series. n = 1 n 1 bnsmne\ (2) It will be found preferable to find #1 and bi directly rather than to deduce these coefficients from general expressions for an and bn. <p £ sin cos* 1 w = °° \ sin n<p + ( I)n2« sin | cos ^r cos n = 2 n = « i ! _ cos Wv? _|_ ( _ !)»2w sin g sin ^ f + E n = 2 2^ 2 \ Sin«0 w(w2 I)TT This may be^simplified as follows: ...(3) Where C0 = a0 Cn = V a2n 5n = arc tan (£) (4) (5) The coefficients Cn have been plotted in Fig. 2. They show the effective loss of fundamental response and the generation of harmonics occasioned by increasing the size of the aperture. The aperture effect is again encountered in the reproducer. If it is assumed that the light intensity is uniform over a rectangular reproducing aperture and the reproducing film speed, g, is constant the distortion introduced will be found to be in the alteration of the amplitudes of the various frequencies only, no additional frequencies being introduced. If CJ) is the amplitude of the recorded wave of fundamental frequency and H is one-half of the width of the sound track available, then the percentage modulation may be expressed as k = — . When the printed record is considered, the origin and base