Ukuzwela, isilinganiso sevolthemu ephumayo ye-analog noma inani eliphumayo ledijithali kungcindezi yokufaka, iyimethrikhi eyinhloko yanoma iyiphi imakrofoni. Ngokufaka okwaziwayo, imephu kusuka kumayunithi esizinda se-acoustic kuya kumayunithi esizinda sikagesi inquma ubukhulu besignali yokuphuma kwemakrofoni. Lesi sihloko sizoxoxa ngomehluko ekucacisweni kokuzwela phakathi kwamakrofoni e-analog neyedijithali, indlela yokukhetha umbhobho ongcono kakhulu wohlelo lwakho lokusebenza, nokuthi kungani ukwengeza kancane (noma ngaphezulu) kwenzuzo yedijithali kungathuthukisaimakrofonie isignali.
i-analog nedijithali
Ukuzwela kwemakrofoni ngokuvamile kukalwa ngegagasi lesine elingu-1 kHz ezingeni lengcindezi yomsindo (SPL) engu-94 dB (noma i-1 Pa (Pa) ingcindezi). Ubukhulu be-analog noma isignali ephumayo yedijithali yombhobho ngaphansi kwalesi simangaliso sokufaka isilinganiso sokuzwela kwemakrofoni. Leli phuzu eliyireferensi lingenye yezici zemakrofoni futhi alimeli konke ukusebenza kwemakrofoni.
Ukuzwela kombhobho we-analog kulula futhi akunzima ukukuqonda. Le metric ngokuvamile iboniswa ngamayunithi e-logarithmic dBV (ama-decibel ahlobene no-1 V) futhi imelela amavolthi esignali yokuphumayo ku-SPL ethile. Kumakrofoni e-analogi, ukuzwela (okuvezwa ngamayunithi alayini we-mV/Pa) kungavezwa nge-logarithmically ngamadecibel:
Ngalolu lwazi kanye nenzuzo efanele ye-preamp, kulula ukufanisa ileveli yesiginali yemakrofoni neleveli yokufaka okuhlosiwe yesekethe noma enye ingxenye yesistimu. Umfanekiso 1 ubonisa indlela yokusetha i-voltage ephumayo yombhobho (VMAX) ukuze ifane ne-ADC's full-scale input voltage (VIN) nenzuzo ye-VIN/VMAX. Isibonelo, ngokuzuza okungu-4 (12 dB), i-ADMP504 enevoltheji ephezulu yokuphuma engu-0.25 V ingafaniswa ne-ADC ene-voltage yokufakwayo yesikali esiphezulu esingu-1.0 V.
Isikhathi sokuthumela: Aug-11-2022
