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 #:
000345
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 325 The curve marked (f ) is for the weakest voice of the fourteen speakers used in this investigation. It will be seen that the articulation for such a speaker, even under the most favorable listening conditions in this auditorium, does not exceed seventy 2.0 3.0 6. a 3.0 Time of Reverberation FIGURE 10. 6.0 7.0 Seconds Group of curves showing how the loudness of a speaker's voice effects the hearing of speech in auditoriums. These curves are for an auditorium having a volume of UOOfiOO cubic feet. The loudness of a speaker's voice is seen to be an important factor. per cent. On the other hand, the curve marked (b) is for the loudest speaker in this series. The curve marked (e) is for the average of the four weakest speakers, and the curve marked (c) is for the average of the four loudest speakers tested in the large auditorium. The curve marked (d) is for the average of the eight speakers. It will be noticed that the louder speakers are heard very much better than the weaker ones — the optimal articulation for the loudest speaker is 83.5 per cent as compared with seventy per cent for the weakest one. This difference is quite significant inasmuch as an articulation of seventy-five per cent is required for satisfactory hearing.