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 #:
000340
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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320 CINEMATOGRAPHIC ANNUAL sound, so arranged as to reenforce the sound directed to the more remote parts of the room. A number of speech articulation tests have shown that the use of such reflecting surfaces behind a speaker are of definite merit, increasing the articulation in large auditoriums as much as three or four per cent. v GO 60 40 on c u J .2 .3 4 .5 .6 .7 .3 .9 Ratio of Noise to Sp&ech Loudness FIGURE 7. 1.0 Curve showing how the noise reduction factor kn depends upon the loudness of noise. The abscissa gives the ratio of the noise loudness to the speech loudness, where both are expressed in db. The influence of the shape of an enclosure upon speech reception requires further quantitative investigation. In the auditorium of conventional rectangular shape, it is probable that the ks (as used in equation (1) ) does not differ appreciably from unity. In very large auditoriums, especially with curved surfaces, it is probable that ks may be reduced to a value as low as .90. It is possible that in small rooms, or in auditoriums designed with properly shaped and located reflecting surfaces, ks may reach a value as high as 1.05. For practical guidance in the design of auditoriums, it probably is advisable to assign a value of 1.0 to ks, unless the shape of the auditorium is of peculiar design.