Cinematographic annual : 1930 (1930)

Record Details:

Title:
Cinematographic annual : 1930
Date:
1930
Publisher:
Hollywood : The American Society of Cinematographers, Inc.
Volume:
Cinematographic annual : 1930
Leaf #:
000339
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Richard Koszarski","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
March 21, 2024
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ARCHITECTURAL ACOUSTICS 319 100 60 a 60 o <o 1 20 10 20 30 40 JO Loudness of Not se d b FIGURE 6. 60 70 Curve showing the interfering effect of noise upon the hearing of speech. The manner of using this curve would be as follows : First determine, by measurement if necessary, the average loudness of the noise in the auditorium. Take the ratio of this loudness level, in db, to the probable loudness level of the speech, in db, and read off from the curve in Fig. 7 the appropriate value of kn. Thus, if it is found that the average noise level in an auditorium is 10 db and the average speech is 50 db, the value of kn would be .925. The average noise prevalent in typical auditoriums is rarely lower than 5 db, and may sometimes be as high as 20 to 25 db. (e) Effect of Shape of Auditorium upon Speech Reception. No quantitative tests have yet been conducted to determine the effect of shape upon the hearing of speech. There is undoubtedly some benefit to be gained from suitably located wall and ceiling surfaces near the speaker or the source of the sound, but more data are required to determine the exact benefit derived from such design. In general, it may be stated that it is advantageous to have good reflecting surfaces located near the source of the