Video: Koj txhais cov teeb liab rau lub suab nrov li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Teeb liab-rau-Noise Ratio piav qhia
Piv txwv li, thaum lub suab hais npe a teeb liab-rau-lub suab piv ntawm 100 dB, nws txhais tau hais tias theem ntawm lub suab teeb liab yog 100 dB siab tshaj li qib ntawm cov suab nrov . A teeb liab-rau-lub suab piv Qhov tshwj xeeb ntawm 100 dB yog qhov zoo dua li ib qho uas yog 70 dB (lossis tsawg dua).
Ib yam li ntawd, koj nyeem cov teeb liab rau lub suab nrov li cas?
SNR xam - Nyuaj Rau lub hwj chim, SNR = 20 log(S ÷ N); rau voltage, SNR = 10 log(S ÷ N). Qhov tshwm sim ntawm qhov kev suav no yog SNR hauv decibels. Piv txwv li, koj ntsuas suab nrov tus nqi (N) yog 1 microvolt, thiab koj teeb liab (S) yog 200 millivolts. SNR yog 10 log.
Tsis tas li ntawd, dab tsi yog qhov tseem ceeb ntawm lub teeb liab rau lub suab nrov piv? Teeb liab rau suab nrov piv yog tseem ceeb vim hais tias hauv kev sib txuas lus peb lub ntsiab tseem ceeb yog rau teeb liab tab sis thaum kis tau tus mob nws tau cuam tshuam los ntawm ib co random suab nrov . Thaum kawg tau txais peb xav kom muaj tib yam kis tau tus mob teeb liab , kom ua tiav qhov no suab nrov yuav tsum tau txo qis thiab ntawm no SNR play ib tseem ceeb luag hauj lwm.
Nyob rau hauv txoj kev no, dab tsi yog lub teeb liab zoo rau lub suab nrov piv?
A piv ntawm 10-15dB yog qhov tsawg kawg nkaus lees txais los tsim kev sib txuas tsis ruaj khov; 16-24dB (decibels) feem ntau suav hais tias tsis zoo; 25-40dB yog zoo thiab a piv ntawm 41dB lossis siab dua yog suav tias yog zoo heev.
Kuv tuaj yeem txhim kho kuv lub teeb liab rau lub suab nrov li cas?
Rau nce tus teeb liab-rau-lub suab piv , peb yuav tsum muab cov FIDs los ntawm lub qhov rais muaj nuj nqi uas yuav txo tau cov suab nrov thiab coj mus rau ib tug txheeb ze nce hauv teeb liab zog.
Pom zoo:
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