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Understanding Sound Measurement: Key Concepts in Sound Pressure Levels

This guide covers essential details on sound measurement, focusing on sound pressure levels (SPL), sound intensity (I), and sound power (W). It explains the relationships between these concepts, including the calculations for effective sound pressure, total sound intensity, and the logarithmic scale used in sound level measurements. Discover how sound pressure levels are measured in decibels (dB) and the implications of different values, which are crucial for various applications, from occupational health to audio engineering.

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Understanding Sound Measurement: Key Concepts in Sound Pressure Levels

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    1. ???????????? ???:??? ??

    2. -1- ?? ????……………………………………………….......2 ???????……………………………………....…5 ????……………………………………………......…6 ??????????????………………..…8 Lp?LI?Lw …………………………….....…………......12 ?????????………………………...…..16 ????????………………………………...20

    3. -2- ????: 1.????????,???:????????????? 2.??????????????(OSHA)????:????????????????

    4. -3- ????: ??????: ????????????????????????..?? ???????: 1.??????????? 2.???????????? 3.?????????

    5. -4- ?????: ????????????: ?????:?????????< 1sec? ?????:????????????? ?????:???????,?????? ?????:??????????<0.035sec,?????????20dB<0.5sec,????>1sec? ?????:???????????????

    6. -5- ??????? ?= cT = c/f c????T???

    7. -6- ???? ???????20~20000HZ,?????,????????????,?????????????? ????:ί=f2-f1=f0(2(n/2)-2-(n/2))=ίf0 f2?f1????????? f0?????,??????????? fo=

    8. -7- ???? ????????????????21/3????1/3?????,???????????????????????,???????????? ??????????f2=2nf1 ?n=1??????,?f2=2f1 n=1/2?1/2?????,?f2=1.414f1 n=1/3?1/3?????,?f2=1.26f1 ?????n~??????f1?f2?f0??????

    9. -8- ?????????????? ????(Sound Power;W ): ?????????????,??????????,?????(Watts)? ????(Sound Intensity;I): ?????????????,?????????????????????,???(W/m2)? ????(Sound Pressure;P): ?????????????????,???(Pa)?

    10. -9- ??????? N???????,?????????????(Itotal),??????????,?: Itotal=I1+I2+I3+…+In ?I1=P12/?c, I2=P22/?c, In=Pn2/?c,?: P2total=P12+P22+…..+Pn2

    11. -10- ????????????? ????(Effective sound pressure;Prms): ???????(Root Mean Square)???????;Prms= I=P2rms/?c

    12. -11- ???????????? ?????????????????W??????????,????????r??????I???????: I=W/A = W/4pr2 Prms=(?cI)1/2

    13. -12- Lp?LI?Lw

    14. -13- ???????? ?n???,???????? Lp(total)=Lp1+10log n ?????,?????? Lp=10log(100.1Lp1+100.1Lp2+100.1Lp3+….)

    15. -14- LI?LP??? ? ? I=P2/?c ??: LI=LP-Cf,????????,????;LI?LP

    16. -15- Lp?LI?Lw???

    17. -16- ?????? ???(????????????6dB) ???? ?L=20log — ???(????????????3dB) ???? ?L=10log — ?????????

    18. -17- ????????? ?????? ?????? SPL,SIL,SWL Lp=Lw-20logr-K K =11 (????) =8 (?????) =5 (Ό????)

    19. -18- ????????? ?????? ?L=10log[100.1L1+100.1L2+···+100.1Ln] ?????? ??????10????,?????? ?????? ???(fn+1=2fn) ???????(fn+1=21/3fn) ?????(fc<1000HZ)

    20. -19- ????????? ?????? ???? ???? ?L=10log—,(3~10dB) A:???(A=aa) a:????(0.01~1.2) ???? T.L :????,20~40dB

    21. -20- ???????? ?????????

    22. -21- ???????? ?????

    23. -22- ???????? ?????

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