Lub teeb liab rau lub suab nrov yog dab tsi thiab vim li cas nws tseem ceeb?
Lub teeb liab rau lub suab nrov yog dab tsi thiab vim li cas nws tseem ceeb?

Video: Lub teeb liab rau lub suab nrov yog dab tsi thiab vim li cas nws tseem ceeb?

Video: Lub teeb liab rau lub suab nrov yog dab tsi thiab vim li cas nws tseem ceeb?
Video: Tshuaj theem vim li cas thiaj tau nqi ?/ Siv kho mob dab tsi?/paris polyphylla use for? 2024, Kaum ib hlis
Anonim

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.

Xav txog qhov no, kev siv lub teeb liab rau lub suab nrov yog dab tsi?

Teeb liab-rau-nrawm piv (ua luv SNR los yog S/N) yog kev ntsuas siv hauv kev tshawb fawb thiab engineering uas sib piv cov qib ntawm qhov xav tau teeb liab mus rau theem ntawm keeb kwm yav dhau suab nrov . SNR yog txhais raws li tus piv ntawm teeb liab zog rau suab nrov hwj chim, feem ntau qhia nyob rau hauv decibels.

Tsis tas li ntawd, dab tsi yog lub teeb liab zoo rau lub suab nrov piv rau lub turntable? Yuav muaj ntau dua suab nrov los ntawm lwm qhov chaw uas koj yuav hnov ua ntej. 50dB yog a zoo txaus S/N piv rau nruab nrab mloog. Thiab 60 dB lossis siab dua yog heev zoo.

Ua raws li qhov no hauv kev txiav txim siab, 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.

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.

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