Video: Qhov txawv ntawm NBFM thiab WBFM yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
NBFM siv me me ntawm kev sib txawv, WBFM siv ntau npaum li cas. NBFM siv me me ntawm kev sib txawv, WBFM siv ntau npaum li cas. Modulating ib lub teeb liab cov cab kuj tsim cov sidebands, uas yog ib tug complex sib tov ntawm frequencies ob sab ntawm cov cab kuj zaus.
Kuj nug, qhov txawv ntawm wideband thiab narrowband yog dab tsi?
A nqaim system txhawb tus nqi qis dua, thaum lub dav dav system txhawb nqa tus nqi siab dua. Lub bandwidth channel raug soj ntsuam thiab cuam tshuam nrog kev sib koom ua ke bandwidth, uas yog qhov zaus band uas txhua yam khoom tuaj yeem cuam tshuam sib npaug.
Ib sab saum toj, Narrowbanding yog dab tsi? Narrowbanding hais txog pej xeem kev nyab xeeb thiab kev lag luam / kev lag luam av mobile xov tooj cua tshuab tsiv teb tsaws ntawm 25 kHz efficiency technology mus rau tsawg kawg yog 12.5 kHz efficiency technology. Narrowbanding tseem hu ua VHF/UHF nqaim vim cov zaus bands cuam tshuam los ntawm nqaim yog nyob rau hauv VHF / UHF ntau yam.
Kuj tseem yuav paub yog, qhov nqaim thiab dav FM yog dab tsi?
Cov ntsiab lus " nqaim "thiab" dav dav ” xa mus rau qhov tseeb xov tooj cua channel bandwidth. Qhov txiaj ntsig ntawm kev siv cov channel nqaim yog lub suab nrov qis dua thiab yog li kev nkag siab zoo dua thiab ntau yam. Qhov zoo ntawm dav dav yog lub peev xwm los hloov cov ntaub ntawv ntau dua.
Qhov txawv ntawm FM thiab PM yog dab tsi?
Zoo, FM & PM ob leeg zoo ib yam li ib leeg. Hauv PM , theem kaum sib txawv linearly nrog modulating teeb liab, thaum nyob rau hauv FM , theem kaum sib txawv linearly nrog ib qho ntawm cov teeb liab modulating. FM (Frequency Modulation): - Hauv FM , zaus ntawm cov teeb liab cab kuj sib txawv raws li cov lus qhia.
Pom zoo:
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