Tsheb acoustics suab nrov tshaj tawm hais txog qhov ua tau zoo uas peb tau saib xyuas nws ib txwm ua raws li hluav taws xob acoustics transducer, yuav qhia tau yooj yim dua nrog lub suab siab theem, cov yam ntxwv ntawm lub suab nrov rau lub suab nrov, ntawm no qhia cov ntsiab lus hauv qab no.
(1) Tus cwj pwm mloog rhiab nyob rau hauv cov qhia ntau zaus. Hauv daim kev cai tswjhwm ntuav raws li qhov chaw pub dawb, lub zog nkag mus rau lub tshuab hluav taws xob yog sib npaug rau 1W liab lub suab nrov lub suab nrov, thiab lub suab nrov yog 1m deb ntawm qhov taw tes rau ntawm kev siv axis. Cov teb dawb yog qhov chaw uas tsis muaj suab nrov cuam tshuam. Hauv qhov chaw, txoj kev sib raug zoo ntawm lub suab siab P tawg tawm los ntawm lub suab kis tau los thiab qhov kev ntsuas deb R yuav tsum yog xws li tias P yog inversely proportional rau R, uas feem ntau ntsuas nyob rau hauv anechoic chamber.
(2) Tus cwj pwm zoo rhiab nyob rau hauv cov qib qhia tshwj xeeb. Ntawd yog, logarithmic tus yam ntxwv rhiab. Logarithm ntawm qhov sib piv ntawm cov xeeb ceem hais txog qhov hnov suab siab yog khoo 20, suav los ntawm dB. Cov kev siv suab siab yog 2 × 10-5Pa.
(3) Lub suab nrov liab daj ntawm lub tsheb suab hais lus tau hais ntawm no yog hom suab nrov, uas yog hais txog cov suab nrov txuas ntxiv mus thiab lub suab nrov nrog cov zaus tso suab dav dav dav sib npaug rau qhov zaus. Qhov ntawd yog hais, nws yog suab nrov nrog tib lub zog hauv qhov sib npaug sib luag ntawm qhov sib npaug tshaj qhov dav dav.
Reference axis tau hais txog ntawm no, yog mus tib seem rau ntawm lub ntsauv ntawm lub ntsiab lus ntawm lub dav hlau hu ua qhov chaw siv, dhau ntawm lub axis thiab txoj kab sib tshuam mus rau qhov chaw siv yog hu ua axis axis, siv axis thiab siv sab saum toj kev sib tshuam kis yog hu ua kev siv taw tes rau.
(4) Nws feem ntau ntsib tias thaum lub tshuab hluav taws xob horn tsis yog 1W, tab sis lwm qhov muaj hwj huam qhov tseem ceeb, tom qab ntawd cov zis tawm suab siab yuav muab xam tau tias yog SPLMAX = Lp+10lgW0, qhov twg Lp - qib siab tus cwj pwm; W0 - Lub hwj chim tswv yim nyob rau tam sim no.