Yadda za a yi bayani da ƙididdige dB, dBm, dBw...mene ne bambanci tsakanin su?

Yadda za a yi bayani da ƙididdige dB, dBm, dBw...mene ne bambanci tsakanin su?

dB yakamata ya zama mafi mahimmancin ra'ayi a cikin sadarwa mara waya.sau da yawa muna cewa "asarar watsawa shine xx dB," "ikon watsawa shine xx dBm," "ribar eriya shine xx dBi" ...

Wani lokaci, wannan dB X na iya rikicewa har ma ya haifar da kurakuran lissafi.To, menene bambancin su?

Maganar dole ta fara da dB.

Lokacin da yazo ga dB, mafi yawan ra'ayi shine 3dB!

3dB sau da yawa yana bayyana a zanen wutar lantarki ko BER (Bit Error Rate).Amma, a gaskiya, babu wani asiri.

Digo na 3dB yana nufin cewa an rage ƙarfin da rabi, kuma ma'anar 3dB yana nufin ma'anar rabin iko.

+3dB yana nufin ninka ƙarfin, -3Db yana nufin raguwa shine ½.Ta yaya wannan ya fito?

A zahiri abu ne mai sauqi qwarai.Bari mu kalli tsarin lissafin dB:

dB yana wakiltar dangantaka tsakanin ikon P1 da ikon tunani P0.Idan P1 sau biyu P0, to:

idan P1 shine rabin P0, to,

game da mahimman ra'ayoyi da kayan aiki na logarithms, zaku iya duba lissafin logarithms.

[Tambaya]: Ana ƙara ƙarfin da sau 10.dB nawa a wurin?

Da fatan za a tuna da dabara a nan.

+3*2

+10*10

-3/2

-10/10

+ 3dB yana nufin cewa an ƙara ƙarfin ta sau 2;

+10dB yana nufin cewa an ƙara ƙarfin da sau 10.

-3 dB yana nufin cewa an rage ikon zuwa 1/2;

-10dB yana nufin cewa an rage ikon zuwa 1/10.

Ana iya ganin cewa dB darajar dangi ce, kuma manufarsa ita ce bayyana babba ko ƙarami a cikin ɗan gajeren tsari.

Wannan dabara na iya sauƙaƙe lissafinmu da bayaninmu sosai.Musamman lokacin zana fom, zaku iya cika shi da kwakwalwar ku.

Idan kun fahimci dB, yanzu, bari muyi magana game da lambobin dangin dB:

Bari mu fara da dBm da dBw da aka fi amfani da su.

dBm da dBw zasu maye gurbin ikon tunani P0 a cikin tsarin dB tare da 1 mW, 1W

1mw da 1w tabbataccen dabi'u ne, don haka dBm da dBw na iya wakiltar cikakkiyar ƙimar iko.

Mai biyowa shine teburin juyar da wutar lantarki don bayanin ku.

Dole ne mu tuna:

1w = 30dBm

30 shine ma'auni, wanda yayi daidai da 1w.

Ka tuna da wannan, kuma hada da baya "+3 *2, +10*10, -3/2, -10/10" za ka iya yin da yawa lissafi:

[Tambaya] 44dBm = ?w

A nan, dole ne mu lura cewa:

Sai dai 30dBm a gefen dama na lissafin, sauran abubuwan da aka raba dole ne a bayyana su cikin dB.

[Misali] Idan ƙarfin fitarwar A shine 46dBm kuma ƙarfin fitarwa na B shine 40dBm, ana iya cewa A shine 6dB ya fi B.

[Misali] Idan eriya A shine 12 dBd, eriyar B shine 14dBd, ana iya cewa A shine 2dB karami fiye da B.

Misali, 46dB yana nufin P1 shine sau dubu 40 P0, kuma 46dBm yana nufin darajar P1 shine 40w.Akwai bambancin M guda ɗaya, amma ma'anar na iya bambanta gaba ɗaya.

Iyalin dB gama gari kuma suna da dBi, dBd, da dBc.Hanyar lissafin su daidai yake da hanyar lissafin dB, kuma suna wakiltar ƙimar ƙimar ƙarfi.

Bambancin shi ne cewa ma'aunin nunin su ya bambanta.Wato, ma'anar ikon tunani P0 akan ma'auni ya bambanta.

Gabaɗaya, bayyana riba ɗaya, wanda aka bayyana a cikin dBi, ya fi 2.15 girma fiye da wanda aka bayyana a dBd.Wannan bambance-bambancen yana faruwa ne ta hanyar umarni daban-daban na eriya biyu.

Bugu da ƙari, dangin dB ba za su iya wakiltar riba da asarar wutar lantarki kawai ba amma suna wakiltar wutar lantarki, halin yanzu, da sauti, da dai sauransu.

Ya kamata a lura cewa don samun iko, muna amfani da 10lg (Po / Pi), kuma ga ƙarfin lantarki da na yanzu, muna amfani da 20lg (Vo / Vi) da 20lg (Lo / Li)

Ta yaya wannan sau 2 ya fito daga?

An samo wannan sau 2 daga murabba'in dabarar juyar da wutar lantarki.The n-ikon a cikin logarithm yayi daidai da n sau bayan lissafi.

Kuna iya sake nazarin kwas ɗin ilimin lissafi na makarantar sakandare game da alaƙar juzu'i tsakanin wuta, ƙarfin lantarki, da na yanzu.

A ƙarshe, na bi wasu manyan dangin dB don yin tunani.

Ƙimar dangi:

Cikakken ƙima:

Kuma, bari mu bincika idan kun gane ko a'a.

[Tambaya] 1. Ƙarfin 30dBm shine

[Tambaya] 2. Idan aka ɗauka cewa jimillar fitarwa na tantanin halitta shine 46dBm, idan akwai eriya 2, ƙarfin eriya ɗaya shine.