16-mm sound motion pictures : a manual for the professional and the amateur (1953)

Record Details:

Title:
16-mm sound motion pictures : a manual for the professional and the amateur
Date:
1953
Publisher:
New York : Interscience Publishers
Volume:
16-mm sound motion pictures : a manual for the professional and the amateur
Leaf #:
000266
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
April 11, 2024
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250 IX. SOUND-RECORDING EQUIPMENT AND ARRANGEMENT 16-mm sound-recording machines use slits appreciably narrower than those used on 16-mm sound projectors. The width of the slit in a Maurer machine, for example, is of the order of 0.00012 in. From the curve shown it can be seen that the loss of a Maurer recording slit is less than 1 db at 6000 cps. For practical purposes this loss is negligible ; it is the distortion produced on the film that dictates the use of this very narrow slit. IOO 0.2 0.3 RATIO 0.4 0.5 0.6 0.7 linear width of aperture wavelength of fundamental, Theoretical Output of a Uniformly Illuminated Slit Exactly Perpendicular to Direction of Film Travel3 linear width of slit wavelength of fundamen tal Percent output Db attenuation 0.0 100 0.0 0.1 94 0.5 0.2 82 1.7 0.3 67 3.5 0.4 48 6.5 0.5 32 10. 0.6 18 15. 0.7 8 22. 0.8 3 31. 0.9 1 40. 1.0 0 00 Note : Maximum second harmonic due to scanning occurs at ratio 0.32. Maximum third harmonic due to scanning occurs at ratio 0.5. a For complete opacity on opaque side and complete transmission on transparent side of film. Fig. 61. Theoretical output of slit in relation to recorded wavelength.