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 #:
000668
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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THE APERTURE EFFECT 651 If a cosine wave of unit amplitude and frequency ( — J is recorded, the result is as shown in Fig. 1. ?IG. 1. Recorded wave shape for cosine wave, ip = (-T-) = angular width of recording aperture, -s = linear width of recording aperture. Analytically, this may be expressed as follows: / ( — — J = cos ( — J for 0 ^ 0 < (TT — /9^-v \ for (IT — <f>/2) ^ 8 -T I = 1 for (2ir — where x — linear distance from origin along film = (vf) / = ( <r J = frequency being recorded on film X = (v/f) = wave-length of that frequency on film 6 = (2irx/\) = (coJ) = angular position of arbitrary point, x s = linear^width of recording aperture at the film in direction of film travel <p — ( -T J = angular width of recording aperture y = amplitude of recorded wave at point, x The distortion introduced by the aperture effect is twofold in re•cording, the amplitudes of the various frequencies are altered in rela