326page

320 ^1t48 dLl.| g4 gltr^-l= zlol B€BItrI. trI?+^], ql^lB(decibel, dB)ol4= tglzI rl*91 914. El'l^luJg .JHl4 otr. 0-120dBtr +8q4, rl*g flE- EEB + 9l= 4a zl4 +g 120dB Aszl 94. E, ^I+ol :213 +E a7l= +++"il u+?+ ilolT} ')zl 4Eql, +9 a7)= +48 ul"il= +q 'tlzle+ +tl+= F+41 -s-^l6l= 4ol +s q, QqE= E(phon)9 +trI. +, +E E44"J "Jg s.rlp Q"il= Eil^lHJg 4a, +e-l +r+AoJ =z]E E€+ 4ql= +g +4. O +el qlLJ zl oJE : t9l^l t"il t9l il4'J o|Ll zl olu1. @ decibetEgl : +E .rilzl4 +'Jg +4 s.ts El-n.g 4 2l= +91 (dB)oltrI. @ zz1el AlrJ : qE *E a7)= ole+ E'J+ azle- =4= 1,000H2 f,+E + SalrJ(dB) <}es +4U z)9-E- t9l= (phon)o14. @ +E a7) : a-zlzl Efl +E HIIE 9l61q +E 'J']9 *"il Hlql6l= 4s- = dE4gE ++ (}str t9l= (sone)o14. @ A+AlrJ : A*41tr +dal fI9E, +9= (dB) E.= (phon)o]4. @ zI? H 9l= Zo-ao,oo0Hz, 99 ^'il 7loil Ell+ +E q g * tasol4. @ zl* "J++ +9 +tl+= 3,000-4,000H2o14. @ oJtol rEg Ytt)zl ^146I= +9 a7)= 120dBol4. Ll . =el 3e.a O +E ^{71 : *v}9 A6J oj-a}al +4"J E9lE4g tgrlA(la)"il 5+6}= qlLJ zl ol4. @ +E Eol : 949i0oe?,/f,))A +4.1q, +tl+ f,zl f,4 zHIoJ q= t94 H4z +tr}. @ +4 : +++ E4g 6Iq ,+ +-++ CE"l49 ,Hlzl5 lBe-E +4t +E .EEBoil trlrl Efl4 oE Hlfl$ + 914. E 4-11 ^ele.l a)l dB -H, 7l phon -E- tl 130 ^ll= ?lTl 120 Hl=d7l ?lTloil ^1 )ftl? * 110 ol,\l - al E - -= 110 ^lE^l e4oll^l 2[m] zl al 90 LH-d ^laJ, Tl8 8471 90 ^lnal3 38 LH+ 70 6E^l 70 Eafg aal 50 o^lxl ,t o E - - !E 50 ^E-d ^l+!