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60 to 1024 Cycles
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2048 Cycles
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4096 Cycles
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8192 Cycles
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22 MOTION PICTURE SOUND ENGINEERING
tivity to the high frequencies — the effect lessening as the frequency decreases.
DB Loss in Hearing with Age
Frequency
Ages 20-29 (96 ears)
Ages 30-39 (162 ears)
Ages 40-49 (84 ears)
Ages 50-59 (28 ears)
It is not generally recognized that natural sound which we hear always emanates from its proper source, whereas in artificial reproduction we usually hear sounds which do not emanate from their original source. That is, in a motion picture reproduction, all sound originates from a fixed source — the speaker system. This sound includes both the sound which seems to originate from all portions of the screen, as well as sound that has its apparent source off the screen. As a consequence of this unnatural source of sound, the many factors affecting the relative loudness of the various reproduced sounds must be carefully controlled.
BIBLIOGRAPHY
(1) American Standards Association's Tentative Standards, Z 24.1, Z 24.2 and Z 24.3.
(2) Sound, F. R. Watson — John Wiley 0 Sons, 1935 (See for more complete reference list.)
(3) Acoustics of Buildings, F. R. Watson — John Wiley 8 Sons, 1930.
(4) Applied Acoustics, Olson and Massa — P. Blakiston's Son & Co., 1934.
(5) Speech and Hearing, Harvey Fletcher — D. Van Nostrand Co., 19 29.
(6) Vibrating Systems and Sound, Crandall — D. Van Nostrand Co., 19 27.
(7) Architectural Acoustics, V. O. Knudsen — John Wiley & Sons, 1932.
(8) Loudness, Its Definition, Measurement and Calculations, Fletcher and Munson — Journal Acoustical Society of America, Volume V, No. 2, p. 82.