Uvakalelo, umlinganiselo we-analog output voltage okanye ixabiso lemveliso yedijithali kuxinzelelo lwegalelo, yimetric ephambili kuyo nayiphi na imakrofoni.Ngegalelo elaziwayo, ukwenza imephu ukusuka kwiiyunithi zesizinda se-acoustic ukuya kwiiyunithi zesizinda sombane kugqiba ubukhulu bomqondiso wokuphuma kwemakrofoni.Eli nqaku liza kuxoxa ngomahluko kwiinkcukacha zobuntununtunu phakathi kwe-analog kunye ne-microphone zedijithali, indlela yokukhetha eyona mibhobho yesicelo sakho, kwaye kutheni ukongeza isuntswana (okanye ngaphezulu) yenzuzo yedijithali kunokuphuculaimakrofonie umqondiso.
i-analog kunye nedijithali
Uvakalelo lwemakrofoni ngokuqhelekileyo lulinganiswa ne-1 kHz sine wave kwinqanaba loxinzelelo lwesandi (SPL) lwe-94 dB (okanye i-1 Pa (Pa) uxinzelelo).Ubukhulu be-analog okanye i-digital output signal ye-microphone phantsi kwesi sixhobo sokuvuselela igalelo ngumlinganiselo we-microphone sensitivity.Le ngongoma yereferensi yenye yeempawu ze-microphone kwaye ayimeli yonke into eyenziwa ngumbhobho.
Uvakalelo lwe-analog microphone lulula kwaye alunzima ukuyiqonda.Le metric ibonakaliswe ngokubanzi kwiiyunithi ze-logarithmic dBV (i-decibels ngokumalunga ne-1 V) kwaye imele ii-volts zesignali yemveliso kwi-SPL enikiweyo.Kwiimakrofoni ze-analog, ubuntununtunu (obubonakaliswe kwiiyunithi zomgca mV/Pa) bunokubonakaliswa nge-logarithmically kwiidecibels:
Ngolu lwazi kunye nenzuzo echanekileyo ye-preamp, kulula ukufanisa inqanaba lesignali yemakrofoni kwinqanaba legalelo elijoliswe kuyo lesekethe okanye enye inxalenye yenkqubo.Umzobo we-1 ubonisa indlela yokuseta i-microphone ye-peak output voltage (VMAX) ukuze ihambelane ne-ADC ye-voltage ye-input input voltage (VIN) kunye nenzuzo ye-VIN / VMAX.Ngokomzekelo, ngenzuzo ye-4 (12 dB), i-ADMP504 ene-voltage ephezulu yokuphuma kwe-0.25 V inokudityaniswa ne-ADC ene-peak-scale epheleleyo yombane we-1.0 V.
Ixesha lokuposa: Aug-11-2022
