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 #:
000333
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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architp:ctural, acoustics 313 average loudness which this acoustic power would produce in rooms of different sizes would depend upon the total amount of absorption in the rooms, since the average intensity of a sound in a room is inversely proportional to the total amount of absorption in the room. The curve in Fig. 2 shows the average loudness of speech of 50 440 1 1 **> 25,000 50,000 /OQOOO 200,000 400,000 8oqooo 1,600,000 Volume ci/. ft FIGURE 2. Curve showing the probable loudness, in db, of the average speaker in rooms of different sizeSj all having a time of reverberation of 1.25 seconds. the average speaker in rooms of different sizes all having the same time of reverberation, namely 1.25 seconds. By referring to the dotted line curve in Fig, 3, which shows Fletchers data for speech articulation at different loudness levels of speech, it will be observed that the average loudness of speech in large auditoriums, namely, 45 db. or less, is at a critically low level, so that the slightest interference from noise, or the slightest downward modulation of the voice will make hearing conditions unsatisfactory. The early Greeks were fully aware of this inadequacy in the loudness of speaker's voices, and attempted to compensate for