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F• ... „..! 1 <br /> • <br /> 1 <br /> ,,- <br /> w 1 <br /> 411 <br /> Note that Fig. 9 applies to speech outdoors , not inside buildings. <br /> i <br /> Aircraft noise frequently interferes with conversation inside buildings. <br /> tz <br /> Howmuch? Determining that answer can be complex except in residential <br /> W.: <br /> spaces ; it involves knowledge of the building' s abili6F to protect <br /> I <br /> against aircraft noise , information about the level of aircraft noise , <br /> •!! <br /> ..1- and knowledge of the kind of activity taking place in the building. <br /> Each situation should be studied with care. We do not discuss <br /> t.- generalizations here because they could be misleading!. <br /> I <br /> However , in houses we can make a good estimate of the environment <br /> for communication with the help of Fig. 1C . Figure 0 shows the <br /> t percentage of sentences a listener should be able to understand in <br /> various noise environments . The relationship is valid when the room is <br /> i <br /> normally furnished and the listener is more than a meter away from the <br /> t! , <br /> r speaker . <br /> I <br /> .i, <br /> loo 1----- i 1 <br /> t 1 <br /> 99% <br /> I 411 <br /> t )... <br /> 60— 95% <br /> 1.- <br /> — i <br /> 7.5 <br /> I <br /> I a <br /> 1 <br /> a - ... <br /> i 11 1 <br /> ; .... <br /> w ! <br /> , <br /> - <br /> z 1 <br /> i <br /> . w <br /> • ■. 50% <br /> 0 <br /> z i <br /> w <br /> 1-- <br /> 1 <br /> z 40- _ <br /> w ! <br /> m I <br /> 1.... \. . i <br /> z 1 <br /> w <br /> 0 I <br /> 3 20- - i <br /> a. 1 <br /> . 1 <br /> i <br /> 0-...1 ..1-_-____I______L. I 1 <br /> 45 50 55 60 65 70 75 I <br /> SOUND LEVEL m, a 1 <br /> 1 <br /> FIG. 10. NORMAL VOICE SENTENCE INTELLIGIBILITY AS A FUNCTION OF SOUND <br /> LEVEL IN AN INDOOR SITUATION. <br /> i :Lt•i', <br /> 26 <br /> 1 <br /> 1 <br /> i . <br /> : 7,...- .,..17,91,hifiiKT.,mia?.;i.' '. ..,: : t ,‘.: ! •:,--.7:::!..,..!i•I,N'i•:•01.,r.....t1,' <br />