Ua ntej yuav ib tus kws tshaj lij FM transmitter, koj tuaj yeem pom ntau qhov tsis sib xws hauv cov npe loj ntawm cov khoom xa tawm. Ib qho tseem ceeb tsis yog hu ua SNR. Yog li SNR yog dab tsi thiab vim li cas nws tseem ceeb? SNR txhais li cas rau kev tshaj tawm xov xwm? Cov ntsiab lus hauv qab no tuaj yeem muab qee cov ntaub ntawv tseem ceeb rau koj. Mus tshawb nrhiav!

Cov ntsiab lus

• Dab tsi yog Qhov Teeb Meem rau Noise Ratio? Vim Li Cas Nws Tseem Ceeb?
• Piv txwv ntawm Teeb Meem rau Noise Ratio
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• Cov Lus Nug

Dab tsi yog Qhov Teeb Meem rau Noise Ratio? Vim Li Cas Nws Tseem Ceeb?

SNR los yog S / N yog lub ntsiab lus ntawm lub teeb liab-rau-nruab nrab piv. Raws li kev ntsuas ntsuas, nws tau siv dav hauv kev tshawb fawb thiab engineering. Hauv kev sib txuas lus wireless, SRN hais txog qhov ntsuas ntawm decibels (dB), uas kuj yog lub teeb liab. Kev sib piv tus lej ntawm lub zog theem thiab lub suab nrov zog.

Thaum tus nqi SNR ntawm tus kws tshaj lij tshaj tawm xov xwm tshaj tawm, nws txhais tau hais tias lub xov tooj cua tshaj tawm yog qhov zoo dua. Vim li cas? Vim tias qhov loj dua SNR tus nqi ntawm lub xov tooj cua tshaj tawm, uas yog, qhov sib piv ntawm lub teeb liab lub zog ntau dua rau qib suab nrov, txhais tau hais tias koj lub xov tooj cua tshaj tawm yuav tau txais cov ntaub ntawv tseem ceeb es tsis txhob muaj suab nrov. Thaum qhov piv ntawm SNR Thaum nws siab dua 0 dB lossis siab dua 1: 1, nws txhais tau tias muaj teeb liab ntau dua li suab nrov. Ntawm qhov tsis sib xws, thaum SNR tsawg dua 1: 1, nws txhais tau tias muaj suab nrov ntau dua li suab nrov.

Koj tuaj yeem pom SNR cov lus qhia tshwj xeeb hauv ntau cov khoom siv suab, suav nrog cov hais lus, xov tooj (wireless lossis lwm yam), headphones, microphones, amplifiers, receivers, turntables, xov tooj cua, CD / DVD / media player, PC suab phaib, Smartphones, ntsiav tshuaj, etc. Txawm li cas los xij, tsis yog txhua tus neeg tsim khoom paub qhov txiaj ntsig no kom meej.

Lub suab nrov tiag tiag feem ntau yog tus cwj pwm dawb lossis hluav taws xob hissing lossis zoo li qub lossis qis lossis vibrating hum. Tig lub suab hais lus tsis ua si; Yog tias koj hnov ​​​​nws, nws yog suab nrov, uas feem ntau hu ua "suab nrov pem teb." Ib yam li lub tub yees hauv qhov xwm txheej yav dhau los tau piav qhia, lub suab nrov tom qab ib txwm muaj.

Raws li ntev raws li lub teeb liab tuaj yog muaj zog thiab ntau dua li lub suab nrov hauv pem teb, lub suab yuav tswj tau qhov zoo, uas yog qhov nyiam tshaj tawm-rau-suab nrov piv rau kom tau txais lub suab meej thiab meej.

Tam sim no xav tias cov teeb liab xav tau yog cov ntaub ntawv yooj yim nrog kev ua yuam kev nruj lossis nqaim, thiab muaj lwm cov teeb liab cuam tshuam nrog koj lub teeb liab xav tau. Ib yam li ntawd, nws ua rau lub luag haujlwm ntawm tus txais kev txiav txim siab qhov xav tau cov teeb liab exponentially nyuaj dua. Nyob rau hauv luv luv, qhov no yog vim li cas nws yog ib qho tseem ceeb kom muaj lub teeb liab-rau-lub suab nrov. Tsis tas li ntawd, nyob rau qee kis, qhov no kuj tseem txhais tau tias qhov sib txawv ntawm cov khoom siv ua haujlwm, thiab hauv txhua kis, nws yuav cuam tshuam rau kev ua haujlwm ntawm transmitter thiab receiver.

Hauv kev siv tshuab wireless, tus yuam sij rau kev ua haujlwm ntawm cov cuab yeej yog tias lub cuab yeej tuaj yeem paub qhov txawv ntawm daim ntawv thov teeb liab raws li cov ntaub ntawv raug cai los ntawm cov suab nrov tom qab lossis teeb liab ntawm lub spectrum. Qhov no suav nrog cov ntsiab lus ntawm tus qauv SNR specification siv rau kev teeb tsa. Tsis tas li ntawd, cov qauv kuv tab tom hais txog kuj ua kom muaj kev ua haujlwm zoo wireless.

Piv txwv ntawm Teeb Meem rau Noise Ratio

Txawm hais tias muaj ntau txoj hauv kev los ntsuas qhov ua tau zoo ntawm cov xov tooj cua txais xov tooj cua, S / N piv lossis SNR yog ib txoj hauv kev ncaj nraim, thiab nws tau siv ntau yam kev siv.

Lub tswv yim ntawm lub teeb liab-rau-lub suab sib piv kuj tseem siv rau ntau qhov chaw, suav nrog lub tshuab suab thiab ntau lwm qhov chaw tsim hluav taws xob.

Lub teeb liab-rau-nruab piv ntawm lub teeb liab hauv qhov system yog yooj yim to taub, yog li nws tau siv dav hauv ntau qhov chaw.

Txawm li cas los xij, nws muaj ntau yam kev txwv. Txawm hais tias nws tau siv dav, lwm txoj kev siv feem ntau, suav nrog cov suab nrov. Txawm li cas los xij, S / N piv lossis SNR yog qhov tshwj xeeb tseem ceeb thiab tau siv dav los ntsuas qhov kev ua tau zoo ntawm ntau lub RF Circuit Court tsim, tshwj xeeb tshaj yog qhov rhiab heev ntawm cov xov tooj cua txais

Qhov sib txawv feem ntau yog qhia raws li qhov piv ntawm cov teeb liab rau lub suab nrov S / N, feem ntau qhia hauv decibels. Txij li thaum lub teeb liab input theem pom tseeb muaj qhov cuam tshuam rau qhov piv no, cov theem teeb liab tawm tswv yim yuav tsum tau muab. Qhov no feem ntau yog qhia hauv microvolts. Cov kev tawm tswv yim tshwj xeeb yuav tsum tau muab lub teeb liab-rau-lub suab sib piv ntawm 10 dB feem ntau tau teev tseg.

Yog tias lub teeb liab tshwm sim tsis muaj zog, tej zaum koj yuav xav tias qhov ntim yuav tsum tau nce ntxiv kom cov zis ntau ntxiv. Hmoov tsis zoo, kho lub ntim nce thiab nqis yuav cuam tshuam rau lub suab nrov hauv pem teb thiab teeb liab. Lub suab paj nruag yuav nrov dua, tab sis lub suab nrov kuj yuav nrov dua. Koj tsuas yog yuav tsum tau nce lub teeb liab lub zog ntawm qhov chaw kom ua tiav cov txiaj ntsig xav tau. Qee cov khoom siv kho vajtse lossis software tsim los txhim kho lub teeb liab-rau-nruab nrab piv.

Hmoov tsis zoo, tag nrho cov khoom siv, txawm tias cov cables, ntxiv qee cov suab nrov rau lub suab teeb liab. Cov khoom siv zoo tshaj plaws yog tsim los ua kom lub suab nrov hauv pem teb kom tsawg li sai tau kom ua kom qhov sib piv. Lub teeb liab-rau-lub suab sib piv ntawm cov khoom siv analog xws li amplifiers thiab turntables feem ntau qis dua li cov khoom siv digital.

Rau cov tshuab wireless, koj lub suab zoo nyob ntawm qhov ua tau zoo tshaj plaws ntawm cov teeb liab-rau-suab nrov piv. Yuav kom ua tiav SBR siab, peb yuav tsum paub qhov ua rau thiab hom suab nrov hauv nqe lus nug. "Lub suab nrov" yog hais txog txhua yam kev sib tw teeb liab cuam tshuam hauv lub cev qhov chaw tsis xav tau lub suab, zoo li qub, lossis lwm zaus. Yog tias koj siv lub microphone wireless, koj lub suab nrov kuj yog qhov tshwm sim ntawm lub suab nrov hauv lub sijhawm FM. "FM", vim hais tias tag nrho cov analog wireless systems siv zaus hloov pauv kom xa cov suab paj nruag. Ib qho tseem ceeb ntawm cov txheej txheem FM yog cov nyhuv ntes: lub wireless receiver yuav ib txwm demodulate (hloov mus rau suab) lub teeb liab RF muaj zog tshaj plaws ntawm ib zaus, nrog rau cov suab uas koj tsis xav tau.

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Qhov no ua rau peb nco ntsoov tias thaum yuav cov kws tshaj lij tshaj tawm xov xwm, peb tuaj yeem siv tus nqi tiag tiag ntawm SNR piv ua ib qho ntawm cov ntsuas hluav taws xob siv, tab sis nws tsis pom zoo raws li qhov taw qhia nkaus xwb. Lwm yam kev ntsuas hluav taws xob xws li cov lus teb zaus thiab kev sib haum xeeb yuav tsum tau suav nrog hauv kev siv. Scope. Yog tias koj tsis paub yuav xaiv qhov zoo tshaj plaws FM xov tooj cua transmitter, thov hu rau FMUSER, peb yog ib tug thawj-chav kawm ntawv xov tooj cua chaw nres tsheb khoom chaw tsim tshuaj paus.

FAQ

1. Dab tsi yog Qhov Teeb Meem rau Lub Suab nrov hauv FM?

Rau SSB-FM teeb liab ntxiv rau qhov nqaim-band Gaussian suab nrov ntawm lub tswv yim (qhov twg cov tswv yim SIGNAL NOISE RATIO loj dua), lub teeb liab-rau-suab nrov piv (SIGNAL TO NOISE RATIO) ntawm qhov tso tawm ntawm qhov zoo tshaj plaws FM ntes tau txiav txim siab. raws li kev ua haujlwm ntawm qhov ntsuas ntsuas ntsuas.

2. Dab tsi yog Qhov Teeb Meem rau Cov Suab nrov ntawm RF?

Cov theem ua ntej nce qhov amplitude ntawm lub teeb liab ntau zaus, yog li kev txhim kho lub teeb liab-rau-lub suab nrov piv...Thaum qhov kev txhim kho FM ntau dua 1, qhov kev txhim kho SIGNAL NOISE RATIO ib txwm los ntawm tus nqi ntawm kev nce bandwidth. nyob rau hauv lub receiver thiab kis tau tus mob txoj kev.

3. Dab tsi yog Qhov Teeb Meem rau Cov Suab nrov ntawm RF?

Lub teeb liab rau Noise Ratio (SNR) yeej tsis yog qhov piv, tab sis tus nqi decibel (dB) uas yog siv los ntsuas qhov sib txawv ntawm lub teeb liab lub zog thiab lub suab nrov tom qab. Piv txwv li, lub teeb liab lub zog yog -56dBm, lub suab nrov yog - 86dBm, thiab lub teeb liab-rau-suab nrov piv yog 30dB. Lub teeb liab-rau-lub suab sib piv kuj yog ib qho tseem ceeb uas yuav tsum tau xav txog thaum lub sij hawm xa mus.

4. Vim li cas FM thiaj li muaj lub suab nrov zoo dua?

FM muaj suab nrov txo. Piv txwv li, piv rau AM, FM muab lub teeb liab-rau-suab nrov piv piv (SIGNAL TO NOISE RATIO)... Txij li thaum FM teeb liab muaj qhov amplitude tas li, FM receiver feem ntau muaj qhov txwv kom tshem tawm cov suab nrov ntawm lub suab nrov, yog li ntawd. ntxiv txhim kho lub teeb liab-rau-nruab piv.?

5. Vim li cas lub teeb liab rau lub suab nrov yog qhov tseem ceeb?

Kev ua suab nrov thiab cov teeb liab-rau- suab nrov piv yog qhov tseem ceeb ntawm txhua lub xov tooj cua txais xov tooj cua... Pom tseeb, qhov sib txawv ntawm cov teeb liab ntau dua thiab cov suab nrov tsis xav tau, uas yog, ntau dua qhov teeb liab-rau- suab nrov piv lossis teeb liab-rau- suab nrov piv, qhov zoo dua qhov kev ua tau zoo ntawm lub xov tooj cua receiver.