Lub ntsiab lus ntawm qhov hnyav qhov hnyav ntawm lub suab nrov meter yog dab tsi?
Nws yog qhov piv ntawm cov teeb liab muaj txiaj ntsig rau lub suab nrov tsis muaj zog. Nquag, txij li lub hwj chim yog qhov ua haujlwm ntawm qhov tam sim no thiab qhov hluav taws xob, lub teeb liab-rau- suab nrov piv kuj tuaj yeem suav nrog tus nqi hluav taws xob, piv txwv li qhov piv ntawm cov teeb liab theem mus rau theem suab nrov, tab sis nrog cov qauv sib txawv me ntsis. Kev suav ntawm S/N piv los ntawm lub zog: S/N=10 log Kev xam ntawm S/N piv los ntawm qhov hluav taws xob: S/N=10 log Vim qhov S/N piv yog logarithmically ntsig txog lub hwj chim los yog lub voltage, qhov sib piv ntawm cov nqi tso tawm mus rau lub suab nrov yuav tsum tau nce ntxiv yog tias S / N piv yuav tsum tau txhim kho.
Nyob rau hauv ntau cov khoom siv phau ntawv hauv cov lus qhia tshwj xeeb tom qab cov ntaub ntawv, feem ntau yuav muaj lo lus A, lub ntsiab lus A-qhov hnyav, uas yog, qhov hnyav, qhov hnyav txhais tau hais tias ib qho nqi raws li qee cov cai uas ntsuas qhov tseem ceeb ntawm kev hloov kho, vim yog tib neeg pob ntseg ntawm qhov nruab nrab zaus yog qhov tshwj xeeb, yog li yog tias lub amplifier nyob rau hauv nruab nrab-frequency band teeb liab-rau-suab nrov piv yog loj txaus ces, txawm tias lub teeb liab-rau-suab nrov piv nyob rau hauv tsawg-frequency thiab siab- zaus bands me ntsis qis dua tias tib neeg pob ntseg tsis yooj yim rau kev ntes. Yog hais tias lub teeb liab-rau-lub suab piv yog ntsuas nrog qhov hnyav, tus nqi yuav siab dua yam tsis muaj qhov hnyav. Nyob rau hauv cov ntaub ntawv ntawm A-qhov hnyav, tus nqi yuav siab dua qhov tsis muaj qhov hnyav.
Tsis tas li ntawd: txhawm rau simulate tib neeg pob ntseg hnov hauv ntau zaus muaj qhov sib txawv, nyob rau hauv lub suab ntsuas ntsuas tau nruab nrog lub peev xwm simulate cov yam ntxwv ntawm kev hnov lus ntawm tib neeg pob ntseg, cov teeb liab hluav taws xob kho rau lub suab kwv yees kwv yees ntawm tus nqi ntawm lub pob ntseg. network, lub network no hu ua qhov hnyav network. Lub suab siab ntsuas ntsuas los ntawm qhov hnyav network tsis yog lub hom phiaj lub suab lub suab siab theem (hu ua linear sound pressure level), tab sis lub suab siab kho los ntawm kev hnov lus, hu ua qhov hnyav suab los yog suab nrov.
Qhov hnyav network feem ntau muaj A, B, C. A hnyav suab theem yog qhov simulation ntawm tib neeg pob ntseg ntawm cov yam ntxwv zaus ntawm cov suab nrov qis qis qis dua 55dB, B hnyav suab qib yog qhov simulation ntawm zaus cov yam ntxwv ntawm nruab nrab siv suab nrov. los ntawm 55dB txog 85dB, thiab C hnyav suab qib yog qhov simulation ntawm cov yam ntxwv zaus ntawm lub suab nrov nrov. Qhov sib txawv tseem ceeb ntawm peb yog qhov degree ntawm attenuation ntawm cov khoom siv tsawg zaus ntawm lub suab nrov, A attenuation * ntau dua, ua raws li B, C * tsawg dua. A-weighted suab theem vim nws cov yam ntxwv nkhaus yog ze rau lub auditory khoom ntawm tib neeg pob ntseg, yog li tam sim no lub ntiaj teb no lub suab ntsuas nyob rau hauv daim ntawv thov ntawm * dav siv ib tug B, C tau maj mam tsis siv.
Lub suab nrov nyeem los ntawm lub suab ntsuas ntsuas yuav tsum qhia qhov ntsuas qhov ntsuas, xws li chav tsev ntawm dB, thiab kev siv lub network A-qhov hnyav, nws yuav tsum tau sau tseg ua dB (A).
