Musanagule chowulutsira chaukadaulo cha FM, mutha kuwona magawo ambiri ovuta pamndandanda wawukulu wama transmitter. Chimodzi mwazinthu zofunika kwambiri chimatchedwa SNR. Ndiye SNR ndi chiyani ndipo chifukwa chiyani ili yofunika? Kodi SNR imatanthauza chiyani pa ma transmitters? Zomwe zili pansipa zitha kukupatsani zambiri zothandiza. Pitirizani kufufuza!

Timasangalala

• Kodi Signal to Noise Ratio Ndi Chiyani? N'chifukwa Chiyani Ili Yofunika?
• Chitsanzo cha Signal to Noise Ration
• Kutsiliza
• Mafunso Ofunsidwa Kawirikawiri

Kodi Signal to Noise Ratio Ndi Chiyani? N'chifukwa Chiyani Ili Yofunika?

SNR kapena S/N ndiye chidule cha chiŵerengero cha signal-to-noise. Monga gawo loyezera, limagwiritsidwa ntchito kwambiri m'magawo a sayansi ndi uinjiniya. Polankhulana opanda zingwe, SRN imatanthawuza kuyeza kwa ma decibel (dB), omwenso ndi chizindikiro. Kuyerekeza kwa chiwerengero cha msinkhu wa mphamvu ndi mphamvu ya phokoso.

Mtengo wa SNR wa katswiri woulutsira mawu ukakhala wokwera, zikutanthauza kuti chowulutsira chowulutsa chimakhala chapamwamba kwambiri. Chifukwa chiyani? Chifukwa chokulirapo mtengo wa SNR wa chowulutsira mawu, ndiye kuti, kuchuluka kwa mphamvu ya siginecha kumlingo wamphamvu yaphokoso, kumatanthauza kuti chowulutsira chanu chidzapeza zambiri zothandiza m'malo mwaphokoso. Pamene chiŵerengero cha SNR Chikachuluka kuposa 0 dB kapena kuposa 1: 1, zikutanthauza kuti pali chizindikiro chochuluka kuposa phokoso. M'malo mwake, pamene SNR ili yochepa kuposa 1: 1, zikutanthauza kuti pali phokoso kuposa phokoso.

Mutha kupezanso mafotokozedwe a SNR pazinthu zambiri zosinthira ma audio, kuphatikiza okamba, mafoni (opanda ziwaya kapena zina), mahedifoni, maikolofoni, amplifiers, olandila, ma turntable, ma wayilesi, ma CD/DVD/media player, makadi amawu a PC, Ma Smartphones, mapiritsi, etc. Komabe, si onse opanga amadziwa bwino mtengo uwu.

Phokoso lenileni nthawi zambiri limadziwika ndi kuwomba koyera kapena kwamagetsi kapena kung'ung'udza kapena kutsika kapena kunjenjemera. Kwezani voliyumu ya sipika popanda kusewera; ngati mukumva mluzi, ndi phokoso, lomwe nthawi zambiri limatchedwa "phokoso." Monga firiji yomwe yafotokozedwa kale, phokoso lakumbuyo limakhalapo nthawi zonse.

Malingana ngati chizindikiro chomwe chikubwera chimakhala champhamvu komanso chokwera kwambiri kuposa phokoso la phokoso, mawuwo amakhalabe apamwamba kwambiri, omwe ndi omwe amawakonda kwambiri kuti apeze phokoso lomveka bwino komanso lolondola.

Tsopano tiyerekeze kuti chizindikiro chomwe mukufuna ndi data yoyambira yokhala ndi kulolerana kolakwika kapena kocheperako, ndipo pali zizindikiro zina zomwe zimasokoneza chizindikiro chomwe mukufuna. Momwemonso, zimapangitsa kuti ntchito ya wolandirayo kuti asinthe chizindikiro chofunikira kukhala chovuta kwambiri. Mwachidule, ndichifukwa chake ndikofunikira kukhala ndi ma sign-to-phokoso apamwamba. Kuphatikiza apo, nthawi zina, izi zitha kutanthauzanso kusiyana pakugwiritsa ntchito zida, ndipo nthawi zonse, zimakhudza magwiridwe antchito pakati pa chotumizira ndi cholandila.

Muukadaulo wopanda zingwe, chinsinsi cha magwiridwe antchito a chipangizocho ndikuti chipangizocho chitha kusiyanitsa chizindikiro cha pulogalamu ngati chidziwitso chazamalamulo kuchokera kuphokoso lililonse lakumbuyo kapena chizindikiro pa sipekitiramu. Izi zikufotokozera mwachidule tanthauzo la SNR yokhazikika yomwe imagwiritsidwa ntchito pokhazikitsa. Kuphatikiza apo, miyezo yomwe ndikunena imatsimikiziranso magwiridwe antchito opanda zingwe.

Chitsanzo cha Signal to Noise Ration

Ngakhale pali njira zambiri zoyezera kukhudzidwa kwa olandila wailesi, chiŵerengero cha S/N kapena SNR ndi imodzi mwa njira zolunjika kwambiri, ndipo zimagwiritsidwa ntchito pazinthu zosiyanasiyana.

Lingaliro la chiŵerengero cha signal-to-noise chimagwiritsidwanso ntchito m'magawo ena ambiri, kuphatikizapo makina omvera ndi zina zambiri zamagulu opanga maulendo.

Chiŵerengero cha chizindikiro ndi phokoso la chizindikiro mu dongosolo ndi chosavuta kumva, choncho chagwiritsidwa ntchito kwambiri m'madera ambiri.

Komabe, ili ndi malire ambiri. Ngakhale kuti amagwiritsidwa ntchito kwambiri, njira zina zimagwiritsidwa ntchito, kuphatikizapo ziwerengero zaphokoso. Komabe, chiŵerengero cha S/N kapena SNR ndichinthu chofunikira kwambiri ndipo chimagwiritsidwa ntchito kwambiri kuyeza magwiridwe antchito amitundu yambiri ya RF, makamaka kukhudzika kwa olandila wailesi.

Kusiyanaku kumawonetsedwa ngati chiŵerengero cha chizindikiro ku phokoso la S/N, lomwe nthawi zambiri limawonetsedwa mu ma decibel. Popeza mulingo wolowetsa chizindikiro mwachiwonekere umakhudza chiŵerengero ichi, mulingo wa siginecha wolowetsa uyenera kuperekedwa. Izi nthawi zambiri zimawonetsedwa mu ma microvolts. Mulingo wolowera womwe umafunikira kuti upereke chiwongolero cha 10 dB nthawi zambiri umatchulidwa.

Ngati chizindikirocho chikhala chofooka, mungaganize kuti voliyumu iyenera kuwonjezeredwa kuti muwonjezere kutulutsa. Tsoka ilo, kusintha voliyumu m'mwamba ndi pansi kumakhudza phokoso lapansi ndi chizindikiro. Nyimbo zimatha kukulirakulira, koma phokoso lomwe lingakhalepo lidzakulirakulira. Muyenera kuwonjezera mphamvu ya chizindikiro cha gwero kuti mukwaniritse zomwe mukufuna. Zida zina zimakhala ndi zida za hardware kapena mapulogalamu opangidwa kuti apititse patsogolo chiŵerengero cha signal-to-noise.

Tsoka ilo, zigawo zonse, ngakhale zingwe, zimawonjezera phokoso linalake ku siginecha yomvera. Zigawo zabwino kwambiri zimapangidwira kuti phokoso likhale lochepa kwambiri kuti liwonjezere chiŵerengero. Chiŵerengero cha ma signal-to-noise cha zipangizo za analogi monga ma amplifiers ndi ma turntables nthawi zambiri zimakhala zotsika kusiyana ndi zipangizo zamakono.

Kwa makina opanda zingwe, kumveka kwanu kwa mawu kumadalira kwambiri kupeza chiŵerengero chapamwamba kwambiri cha ma signal-to-noise. Kuti tikwaniritse SBR yapamwamba, tiyenera kudziwa chifukwa chake ndi mtundu wa phokoso lomwe likufunsidwa. "Phokoso" limatanthawuza kusokoneza kwamtundu uliwonse wamtundu wamtundu womwe sikufunika, ma static, kapena ma frequency ena. Ngati mugwiritsa ntchito maikolofoni opanda zingwe, phokoso lanu lingakhalenso chifukwa cha phokoso lamayendedwe pa FM. "FM", chifukwa makina onse opanda zingwe a analogi amagwiritsa ntchito ma frequency modulation kuti atumize ma audio. Chofunikira kwambiri pamayendedwe a FM ndikujambula: wolandila opanda zingwe nthawi zonse amatsitsa (kusintha kukhala zomvera) siginecha yamphamvu kwambiri ya RF pafupipafupi, kuphatikiza zomveka zomwe simukufuna.

Kutsiliza

Izi zimatikumbutsa kuti pogula ma transmitters odziwika bwino, titha kugwiritsa ntchito mtengo wokwanira wa chiŵerengero cha SNR monga chimodzi mwa zizindikiro zamagetsi, koma sizovomerezeka ngati chizindikiro chokha. Zizindikiro zina zamagetsi zamagetsi monga kuyankha pafupipafupi ndi kusokoneza kwa ma harmonic ziyenera kuphatikizidwa muzofotokozera. Mbali. Ngati simukudziwa momwe mungasankhire chowulutsa chabwino kwambiri cha wailesi ya FM, chonde lumikizanani ndi FMUSER, Ndife kalasi yoyamba akatswiri zida wailesi wailesi.

FAQ

1. Kodi Signal to Noise Ratio mu FM ndi chiyani?

Pa siginecha ya SSB-FM kuphatikiza phokoso la gulu lopapatiza la Gaussian pakulowetsa (komwe zolowetsa SIGNAL TO NOISE RATIO ndizokulirapo), chiŵerengero cha ma sign-to-noise (SIGNAL TO NOISE RATIO) pakutulutsa kwa chowunikira choyenera cha FM chimatsimikiziridwa. monga ntchito ya modulation index.

2. Kodi Signal to Noise Ratio mu RF ndi chiyani?

Gawo loyamba limakulitsa matalikidwe a ma frequency apamwamba a siginecha, potero kumapangitsa kuti chiwongolero cha ma sign-to-phokoso chiwonjezeke ... Pamene kusintha kwa FM kuli kwakukulu kuposa 1, kusintha kwa SIGNAL TO NOISE RATIO nthawi zonse kumabwera pamtengo wowonjezera bandwidth. mu njira yolandirira ndi kufalitsa.

3. Kodi Signal to Noise Ratio mu RF ndi chiyani?

Signal to Noise Ratio (SNR) kwenikweni si chiŵerengero, koma mtengo wa decibel (dB) womwe umagwiritsidwa ntchito poyeza kusiyana pakati pa mphamvu ya chizindikiro ndi phokoso lakumbuyo. Mwachitsanzo, mphamvu ya siginecha ndi -56dBm, phokoso ndi- 86dBm, ndipo chiŵerengero cha chizindikiro-ku-phokoso ndi 30dB. Chiŵerengero cha signal-to-noise ndi chinthu chofunika kwambiri chomwe chiyenera kuganiziridwa panthawi yotumiza.

4. Chifukwa chiyani FM ili ndi ma Signal Noise Ratio yabwinoko?

FM ili ndi kuchepetsa Phokoso. Mwachitsanzo, poyerekeza ndi AM, FM imapereka chiŵerengero chabwino cha ma signal-to-noise (SIGNAL TO NOISE RATIO) ... kupititsa patsogolo chiŵerengero cha signal-to-noise.

5. Chifukwa chiyani Signal to Noise Ratio ndiyofunikira?

Phokoso ndi chiŵerengero cha chizindikiro ndi phokoso ndizozigawo zazikulu za wolandila wailesi iliyonse... Mwachiwonekere, kusiyana kwakukulu pakati pa chizindikiro ndi phokoso losafunikira, ndiko kuti, chiŵerengero cha signal-to-noise kwambiri kapena chizindikiro-to- chiŵerengero cha phokoso, kumapangitsanso kugwira bwino ntchito kwa wolandila wailesi.