Video: Qhov txawv ntawm dB thiab DB SPL yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
dB , (deciBels), yog qhov ntsuas ntawm cov txheeb ze nce hauv _VOLTAGE_. Xav txog nws hais tias lub amp nce qhov voltage los ntawm 2x. Koj txhais tau tib yam thaum koj muaj qhov nce +3dB. SPL yog suab siab theem.
Ib yam li ib tug yuav nug, dB SPL txhais li cas?
dB ntawm lub suab siab ( dB SPL ) txhais tau tias: 20 log10 p1 / p0 qhov twg p1 yog qhov ntsuas lub suab siab ntawm lub suab, thiab p0 yog tus nqi siv ntawm 20ΜPa, uas sib haum rau qhov qis tshaj qhov hnov ntawm cov hluas, pob ntseg noj qab haus huv.
Ib tug kuj yuav nug, SPL dB xam li cas? Qhov kawg kev sib npaug tuaj yeem hais tau tias, "lub hauv paus 10 ntawm 0.1 sib npaug -1." Unit decibel (symbol dB ) yog ib chav logarithmic qhia qhov piv ntawm ob qhov tseem ceeb.
Lub Decibel.
| Qhov chaw | Suab Siab (Pa) | Lub suab siab (dB) |
|---|---|---|
| Dav hlau cav raws li tau hnov los ntawm 1 yard | 630 | 150 |
Tsis tas li ntawd, qhov txawv ntawm dB thiab DB A yog dab tsi?
dB suab siab theem tsis hnyav. dBA qib yog "A" hnyav raws li qhov hnyav nkhaus kom kwv yees li qhov tib neeg pob ntseg hnov. Piv txwv li, ib 100 dB theem ntawm 100 Hz yuav pom tau tias muaj lub suab nrov sib npaug tsuas yog 80 dB ntawm 1000 Hz.
Thaum hloov los ntawm dB SPL rau dB HL koj puas ntxiv lossis rho tawm tus nqi siv?
Yog hais tias lub suab pib muab rau hauv dB SPL , thiab koj yuav tsum tau nthuav tawm lub suab ntawm 30 dB SL, koj ua tsis tau ua nws tsis siv lub siv tus nqi rau dB HL.
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