50

Maximum Vocal Effort

Shout

Area of Nearly Normal Speech Communication

FIG. 6.3.3 Quality of speech communication as a function of sound level and distance. (Reprinted from James D. Miller, 1971, Effects of noise on people, U.S. Environmental Protection Agency Publication No. NTID 300.7 [Washington, DC: U.S. Government Printing Office.])

Area of Nearly Normal Speech Communication

Maximum Vocal Effort

Shout

Expected Voice Level

Talker to Listener (m)

FIG. 6.3.3 Quality of speech communication as a function of sound level and distance. (Reprinted from James D. Miller, 1971, Effects of noise on people, U.S. Environmental Protection Agency Publication No. NTID 300.7 [Washington, DC: U.S. Government Printing Office.])

factors. Some of these factors have been identified, and their relative importance has been assessed. Responses to aircraft noise have received the greatest attention. Less information is available concerning responses to other noises, such as those of surface transportation and industry and those from recreational activities. Many of the noise rating or forecasting systems in existence were developed to predict annoyance reactions.

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