. Elements of acoustical engineering. Electro-acoustics; Sound. 282 ARCHITECTURAL ACOUSTICS result that there is an optimum reverberation for each auditorium which yields maximum articulation as shown in Fig. The obvious solution is the use of sound reenforcing equipment. The articulation for a weak average and loud talker without amplification as compared to amplified speech is shown in Fig. By proper selection and placement of the loud speakers the articulation characteristic may be made considerably higher. 100 1- z 90 O creo u 0. z 70 2 60 < ^50 o 0:40 K ^ ^ % ^ ) i I 5 5 1
. Elements of acoustical engineering. Electro-acoustics; Sound. 282 ARCHITECTURAL ACOUSTICS result that there is an optimum reverberation for each auditorium which yields maximum articulation as shown in Fig. The obvious solution is the use of sound reenforcing equipment. The articulation for a weak average and loud talker without amplification as compared to amplified speech is shown in Fig. By proper selection and placement of the loud speakers the articulation characteristic may be made considerably higher. 100 1- z 90 O creo u 0. z 70 2 60 < ^50 o 0:40 K ^ ^ % ^ ) i I 5 5 1 8 X REVERBERATION TIME IN SECONDS. REVERBERATION TIME IN SECONDS Fig. X, the articulation of a speaker in auditoriums of various volumes. Y, the articu- lation of amplified speech, loud, average, and a weak speaker in an auditorium of 400,000 cubic feet. B. Sound Motion Picture Reproducing Systems'^^. — The resultant sound energy density at the position of the auditor in a theatre depends upon the response and the directional characteristics of the loud speaker and upon the reverberation characteristics of the theatre. From the standpoint of the auditor, it may be said that there are two sources of sound energy, namely: the direct sound, which travels directly from the loud speaker to the auditor, and the generally reflected sound, which is reflected from the boundaries before reaching the auditor. In a theatre free from acoustical difficulties, the energy density of the generally reflected sound is practically the same for all parts of the theatre. Therefore, the solution of the problem of achieving uniform energy density is to employ reproducers that will project the same direct sound energy to all parts of the theatre. The example which follows will illustrate how this may be accomplished by employing a directional loud speaker. An elevation view of a reproducer in a theatre is shown in Fig. The two extreme points to be supplied are indicated as A and E. If the
Size: 1701px × 1469px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
