Ikimenyetso cya baseband ya digitale ni amashanyarazi yerekana amakuru ya digitale, ashobora guhagararirwa ninzego zitandukanye cyangwa pulses. Hariho ubwoko bwinshi bwibimenyetso bya baseband (nyuma bikitwa ibimenyetso bya baseband). Igicapo 6-1 cerekana bike shingiro rya baseband signal waveforms, kandi tuzokoresha impiswi y'urukiramende nkurugero.
1. Unipolar waveform
Nkuko bigaragara ku gishushanyo cya 6-1 (a), ubu ni bwo buryo bworoshye bwerekana ibimenyetso bya baseband. Ikoresha urwego rwiza nurwego rwa zeru kugirango igaragaze imibare ibiri "1 ″ na" 0, "cyangwa ikoresha kuba ihari cyangwa idahari ya pulses igereranya" 1 ″ na "0 ″ mugihe cyikimenyetso. Ibiranga iyi flimform ni uko nta ntera iri hagati yimpanuka zamashanyarazi, polarite ni imwe, kandi ikorwa byoroshye na TTL na CMOS. Irashobora koherezwa imbere muri mudasobwa cyangwa hagati yibintu byegeranye cyane, nkibibaho byacapwe byacapwe na chassis.
2. Bipolar waveform
Ikoresha impagarike nziza kandi itari nziza kugirango igaragaze imibare ibiri “1 ″ na“ 0, ”nkuko bigaragara ku gishushanyo cya 6-1 (b) .Kuko urwego rwiza kandi rubi rufite amplitude angana na polarite ihabanye, nta kintu cya DC iyo amahirwe ya “1 ″ na“ 0 ″ aragaragara, bifasha kwanduza umuyoboro, kandi urwego rwo gufata icyemezo cyo kugarura ibimenyetso kumpera yakira ni zeru, Kubwibyo, ntabwo bigira ingaruka kumihindagurikire yimiterere, ubushobozi bwo kurwanya kwivanga nabwo burakomeye. Imigaragarire ya ITU-T ya V.24 hamwe n’ishyirahamwe ry’abanyamerika rya Electrotechnical Association (EIA) RS-232C isanzwe byombi ikoresha bipolar waveforms.
3. Unipolar gusubira kuri zeru
Ubugari bukora bwa pulse yubugari-busubira kuri zeru (RZ) ni munsi yubugari bwikimenyetso T, bivuze ko ibimenyetso bya voltage buri gihe bisubira kuri zeru mbere yigihe cyo guhagarika ikimenyetso, nkuko bigaragara ku gishushanyo cya 6-1 (c ) .kwerekana. Mubisanzwe, kugaruka-kuri-zeru ikoresha igice cya kabiri cyamahoro, ni ukuvuga ko umusoro wamahoro (T / TB) ari 50%, kandi amakuru yigihe arashobora gukurwa muburyo butaziguye na unipolar RZ. inzibacyuho.
bihuye no gusubira kuri zeru. Imiterere ya unipolar na bipolar hejuru ni iyisubizwa kuri zeru (NRZ) hamwe ninshingano yinshingano za.
4.Bipolar igaruka kuri zeru
Nuburyo bwo gusubira kuri zeru ya bipolar waveform, nkuko bigaragara ku gishushanyo cya 6-1 (d). Ihuza ibiranga bipolar no gusubira kuri zeru. Kuberako hari intera ya zeru hagati yimpande zegeranye, uwakiriye arashobora kumenya byoroshye ibihe byo gutangira nigihe cyanyuma cya buri kimenyetso, kugirango uwayohereje nuwakiriye ashobora gukomeza guhuza neza biti. Iyi nyungu ituma bipolar nulling waveforms ifite akamaro.
5. Imiterere itandukanye
Ubu bwoko bwa flake yerekana ubutumwa hamwe ninzibacyuho nimpinduka zurwego rwikimenyetso cyegeranye, utitaye kubishobora cyangwa polarite yikimenyetso ubwacyo, nkuko bigaragara ku gishushanyo cya 6-1 (e). Mu gishushanyo, “1 ″ igereranwa no gusimbuka urwego, naho“ 0 ″ igereranwa n'urwego rudahindutse. Birumvikana ko ingingo zavuzwe haruguru nazo zishobora guhinduka. Kubera ko itandukanyirizo ritandukanya ryerekana ubutumwa ugereranije nimpinduka zijyanye nimpinduka zegeranye zegeranye, byitwa kandi isano ya code ya waveform kandi bijyanye nayo, unipolar cyangwa bipolar waveform yabanjirije iyitwa code absolute waveform. Gukoresha imiyoboro itandukanye kugirango wohereze ubutumwa birashobora gukuraho ingaruka zuburyo bwambere bwibikoresho, cyane cyane muri sisitemu yo guhindura ibyiciro. Irashobora gukoreshwa mugukemura ikibazo cyabatwara icyiciro kidasobanutse.
6. Inzira nyinshi
Hariho ibyiciro bibiri gusa byimiterere yavuzwe haruguru, ni ukuvuga, ikimenyetso kimwe cya binary gihuye na pulse imwe. Kugirango tunoze imikoreshereze yumurongo wumurongo, urwego rwinshi rwumurongo cyangwa indangagaciro-nyinshi zirashobora gukoreshwa. Igicapo 6-1 (f) cerekana uburyo bune buringaniye bwa 2B1Q (bits ebyiri zerekanwa nimwe murwego enye), aho 11 ihagarariye + 3E, 10 ihagarariye + E, 00 igereranya -E, naho 01 igereranya -3E.Ibyo urwego rwinshi rwimikorere ikoreshwa muburyo bwihuse bwo kohereza amakuru hamwe na bande ya frequency. Kubera ko impiswi imwe yurwego rwinshi rwimiterere ihuye na binary code nyinshi, igipimo cya biti cyiyongera bitewe nigipimo kimwe cya baud (umurongo umwe woherejwe). Byakoreshejwe henshi.
Twabibutsa ko imiterere ya pulse imwe yerekana ikimenyetso cyamakuru ntabwo byanze bikunze ari urukiramende. Ukurikije ibikenewe hamwe nuburyo umuyoboro umeze, ubundi buryo nka Gaussian pulse, kuzamura cosine pulse, nibindi nabyo birashobora gukoreshwa. Ariko, nuburyo ubwo aribwo buryo bwakoreshwa, ibimenyetso bya baseband ya digitale birashobora guhagararirwa mubiharuro. Niba imirongo yerekana ibimenyetso ni kimwe ariko urwego urwego ruratandukanye.
Ngiyo "Intangiriro kuri Digital Baseband Signal Waveforms" yazanwe na Shenzhen HDV Phoelectron Technology Co., Ltd., Nizere ko iyi ngingo ishobora kugufasha kongera ubumenyi. Usibye iyi ngingo niba ushaka ibikoresho byiza bya fibre itumanaho ibikoresho bya sosiyete ushobora gutekerezaibyerekeye twe.
Shenzhen HDV ifoto yamashanyarazi ikorana buhanga, Ltd ahanini ikora ibicuruzwa byitumanaho. Kugeza ubu, ibikoresho byakozwe bitwikiriyeUrukurikirane rwa ONU, icyiciro cya optique, Urukurikirane rwa OLT, naurukurikirane. Turashobora gutanga serivisi yihariye kubintu bitandukanye. Murakaza nezabaza.
