Mmetụta igwe okwu

Mmetụta, oke nke voltaji mmepụta analọgụ ma ọ bụ uru mmepụta dijitalụ na nrụgide ntinye, bụ metric isi maka igwe okwu ọ bụla. Site na ntinye mara amara, eserese site na ngalaba ngalaba ụda gaa na ngalaba eletriki na-ekpebi ogo mgbama mmepụta igwe okwu. Isiokwu a ga-atụle ọdịiche dị na nkọwapụta uche dị n'etiti igwe okwu analog na dijitalụ, otu esi ahọrọ igwe okwu kacha mma maka ngwa gị, yana ihe kpatara ịgbakwunye ntakịrị (ma ọ bụ karịa) nke uru dijitalụ nwere ike ịkwaliteigwe okwue mgbama.
analog na dijitalụ
A na-atụkarị nghọta igwe okwu site na iji 1 kHz sine wave na ọkwa nrụgide ụda (SPL) nke 94 dB (ma ọ bụ 1 Pa (Pa) mgbali). Ogo nke mgbaama mmepụta analọgụ ma ọ bụ dijitalụ nke igwe okwu n'okpuru mkpali ntinye a bụ ihe nleba anya nke mmetụta igwe. Ebe ntụaka a bụ naanị otu njirimara igwe anaghị anọchi anya arụmọrụ igwe okwu dum.
Mmetụta nke igwe okwu analọg dị mfe ma ọ dịghị esi ike nghọta. A na-egosipụtakarị metrik a na nkeji logarithmic dBV (decibel metụtara 1 V) ma na-anọchi anya volts nke mgbama mmepụta na SPL nyere. Maka igwe okwu analọg, enwere ike igosipụta uche (nke akọwapụtara na nkeji ahịrị mV/Pa) n'ụzọ logarithm na decibels:
Site na ozi a na uru preamp ziri ezi, ọ dị mfe ijikọ ọkwa mgbaàmà igwe na ọkwa ntinye ebumnuche nke sekit ma ọ bụ akụkụ ọzọ nke sistemụ. Ọgụgụ 1 na-egosi otu esi edobe voltaji mmepụta kacha elu nke igwe okwu (VMAX) ka ọ dabara na voltaji ntinye ọnụ zuru oke nke ADC (VIN) yana uru VIN/VMAX. Dịka ọmụmaatụ, na uru nke 4 (12 dB), ADMP504 nwere oke mmepụta voltaji nke 0.25 V nwere ike dakọtara na ADC nwere voltaji ntinye ọnụ zuru oke nke 1.0 V.