rhiab heev, qhov piv ntawm cov analog tso zis voltage los yog digital tso zis tus nqi rau lub input siab, yog ib tug tseem ceeb metric rau tej microphone. Nrog rau cov tswv yim paub, daim ntawv qhia los ntawm acoustic domain units rau hluav taws xob domain units txiav txim siab qhov loj ntawm lub microphone tso zis teeb liab. Tsab ntawv xov xwm no yuav tham txog qhov sib txawv ntawm qhov rhiab heev specifications ntawm analog thiab digital microphones, yuav ua li cas xaiv lub microphone zoo tshaj plaws rau koj daim ntawv thov, thiab vim li cas ntxiv me ntsis (lossis ntau dua) ntawm cov txiaj ntsig digital tuaj yeem txhim kho qhov zoo.microphone teeb liab.
analog thiab digital
Microphone rhiab heev yog feem ntau ntsuas nrog 1 kHz sine yoj ntawm lub suab siab (SPL) ntawm 94 dB (los yog 1 Pa (Pa) siab). Qhov loj ntawm analog lossis digital tso zis teeb liab ntawm lub microphone nyob rau hauv qhov kev tawm tswv yim excitation yog ntsuas ntawm lub microphone rhiab heev. Cov ntsiab lus siv no tsuas yog ib qho ntawm cov yam ntxwv ntawm lub microphone thiab tsis sawv cev tag nrho ntawm lub microphone kev ua haujlwm.
Lub rhiab heev ntawm lub microphone analog yog yooj yim thiab tsis yooj yim to taub. Qhov kev ntsuas no feem ntau qhia hauv logarithmic units dBV (decibels txheeb ze rau 1 V) thiab sawv cev rau cov volts ntawm cov teeb liab tso tawm ntawm qhov muab SPL. Rau analog microphones, qhov rhiab heev (qhia tawm hauv cov kab tawm mV / Pa) tuaj yeem qhia logarithmically hauv decibels:
Nrog rau cov ntaub ntawv no thiab qhov tseeb preamp nce, nws yog ib qho yooj yim kom phim lub microphone teeb liab theem mus rau lub hom phiaj input theem ntawm lub Circuit Court lossis lwm qhov ntawm lub cev. Daim duab 1 qhia yuav ua li cas los teeb tsa lub microphone lub siab tshaj plaws tso zis hluav taws xob (VMAX) kom phim ADC qhov ntsuas hluav taws xob tag nrho (VIN) nrog qhov nce ntawm VIN / VMAX. Piv txwv li, nrog qhov nce ntawm 4 (12 dB), ADMP504 nrog qhov siab tshaj plaws tso zis hluav taws xob ntawm 0.25 V tuaj yeem sib phim rau ADC nrog rau qhov ntsuas qhov siab tshaj plaws ntawm 1.0 V.
Post lub sij hawm: Aug-11-2022
