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<br />
<br />A quiet home or whisper i;; about 33 dBA (decibels). NoDml1 conversation i;;
<br />ahout63 dBA and ajac.kbammcri;; about 103 dBA Table ll.ists the typical round levels
<br />encountered each day by most people. Sound intensity can be perceived differently by
<br />individuals due 1D the efficiency of the individuals karing ability.
<br />
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<br />
<br />.go-sg t~ Mixei;JliQiWWo!-ksbQP/Maiti -Roait r.
<br />iMs. . N~.'-,t.af*6r;.vaooiiiii:~f;~fladlO
<br />"6~:, 'Bb~,~:"N~a!'CM:h :'_, . ....
<br />Y{ \lUI,.~ ,V.'JJf 1.?]'tiOO.
<br />so:5iI . tfrtJiii}ResitrenCe' .twer.i'l}fIlCirQ .' TliMiiiura'l
<br />'. ."" - '- ge " . " Ute '., n.
<br />'4Q:49 ". . .~'tv\Yri~~,w;ng'Room ~.' ::.' . ':
<br />3!b~' .' '.' OUitlf flO~~i;"jii;nJl#maJ:me ' . ',,: . '.": .i/
<br />. . . .... . ,..U1~, . ." _ ~ , "
<br />"'411 -i'ttf ' tr~;:.1M~.-'" "~~9Iti~ ~~~ ,,' ,..". '. .
<br />:-~tr"v' '.= ", : Vi~~ti:9rrr.t~~.\.w.f~FdU..rUJ~.i:".~'. , . ',:' ':>. . .,:': ",::.,' .
<br />~fl'.......:fl', .... - " A':"-~;j.:.,..;,: '~~L';,'. :-~, ,: "... ..-.:: " , . ~ : ,:'
<br />i-:tr:j'O';::.' , '. - ~C,VJ~J.lUj:(t.,..;. _:-:,',.:, .' .'~, ,", '.: '.' ': ',' ':-~.'
<br />Table 1 Typical Sonn~ Levels
<br />
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<br />
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<br />
<br />A change of 3 dBA i;; barley noticeable 1D Ire hlUrull:! ear, but a change of 5 dBA
<br />i;; clearly noticeable 1D the human ear. A change of 10 dBA i;; a doubling of the typ.ica1
<br />loudness of the srnmd. 'Iheoreticany, sound level; decrease by 6 dBA frOm a point
<br />S01lICe fOT each doubling of the distance from the source.
<br />
<br />13 Stndy Parameters
<br />
<br />'..
<br />
<br />JU- 1hil; lIDdy, SOUnd preaure ~ WI:re IIlCaSIImd with a bdio Shacl: 33-
<br />20SSA ...vcr a o..na ~231 DigimI SOODd Slney ~ JIIClr:r. ~.
<br />~Dg )lI1mdI were IIIhm 10 be · point IOIIltle ClQIla- III Ix: .,. . t4ur tnib (IoQdest
<br />
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<br />IOIIRlC fl.1III. ......., ~ )IIBIQ. IlIlbl:r flirt !be iDdilidul ~ of Ibc
<br />.... &ad _....~ hm a IlIImle ill a ~ P'"mI ~ . DIY .......... Of
<br />_.......... -tRd 10 .....~...ct!be 9Iair.alwa-n It a Jiwm ~ ~ hm
<br />k ~ 1I'fR --....cI1IId ~ ware IIbB ill CIICh ~ h at iDItnah:
<br />from ~ 80ur0e.
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