16-mm sound motion pictures, a manual for the professional and the amateur (1949-55)

Record Details:

Title:
16-mm sound motion pictures, a manual for the professional and the amateur
Date:
1949-55
Publisher:
New York : Interscience Publishers, Inc.
Volume:
16-mm sound motion pictures : a manual for the professional and the amateur
Leaf #:
000193
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
April 11, 2024
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FREQUENCY RANGE AND HEARING PERCEPTION 175 UJ 5 80 o UJ Q \ \ AVERAGE LISTENER AVERAGE NOISE LEVEL (43 db) i \ \ s, N v s 1 1 s / X / s> Kfe / / / 1 VJ5 Hf^TO NOISE 1! i 100 200 500 1000 2000 5000 10000 20000 FREQUENCY, CYCLES PER SECOND Fig. 28. Effective hearing contour for average listener situated in average noise. UJ UJ O 60 _T UJ > UJ -J 40 -20 \ \ 1 Mil \ CRITICAL LISTENER LOW NOISE LEVEL (33 db) \ \ \ \ V \ \ *^ /y3K\ / V<t ' 77} LOSS 551 J1SE y r>/s s 4ty. '/± 72 -J 1 50 100 200 500 1000 2000 50O0 10000 200OO FREQUENCY, CYCLES PER SECOND Fig. 28A. Effective hearing contour for critical listener in low noise level. To provide these data, some 2200 measurements of room noise were made and analyzed by Seacord.* Up to the present time, measurements on the projection of 16-mm sound films have not been made in sufficient numbers to justify any broad * Seacord, D. F., "Room Noise at Subscribers' Telephone Locations,'' J. Acoust. Soc. Am., 12, 183, July 1940.