Chiratidzo chedhijitari baseband igetsi waveform inomiririra ruzivo rwedhijitari, iyo inogona kumiririrwa neakasiyana mazinga kana pulses. Kune akawanda marudzi edhijitari baseband masaini (pano anonzi masaini ebhendi). Mufananidzo 6-1 inoratidza mashoma ekutanga baseband siginecha waveforms, uye isu tichashandisa rectangular pulse semuenzaniso.
1. Unipolar waveform
Sezvinoratidzwa mumufananidzo 6-1 (a), iyi ndiyo yakapfava baseband signal waveform. Inoshandisa mwero wakanaka uye zero level kumiririra nhamba dzebhinari "1" uye "0," kana kuti inoshandisa kuvapo kana kusavapo kwepulses kumiririra "1" uye "0" munguva yechiratidzo. Hunhu hweiyi waveform. ndezvekuti hapana kupindirana pakati pemagetsi emagetsi, iyo polarity ndeye imwe chete, uye inogadzirwa nyore neTTL neCMOS maseketi. Inogona kutumirwa mukati mekombuta kana pakati pezvinhu zviri pedyo zvakanyanya, sedhinda redunhu rakadhindwa uye chassis.
2. Bipolar waveform
Inoshandisa mapurusi akanaka neasina kunaka kumiririra nhamba dzebhinari "1" uye "0," sezvakaratidzwa mumufananidzo 6-1 (b). Nokuti mazinga akanaka uye asina kunaka ane maamplitudes akaenzana uye polarities yakasiyana, hapana chikamu cheDC apo mukana we "1" uye "0" inooneka, iyo inobatsira kutapurirana muchiteshi, uye danho resarudzo rekudzoreredza chiratidzo pamagumo ekugamuchira i zero, Naizvozvo, haikanganisike nekuchinja kwemaitiro echiteshi, uye iyo anti-kupindira kugona zvakare yakasimba. ITU-T's V.24 interface standard uye American Electrotechnical Association's (EIA) RS-232C interface standard zvese zvinoshandisa bipolar waveform.
3. Unipolar kudzoka-ku-zero waveform
Iyo inoshanda pulse upamhi hwekudzoka-ku-zero (RZ) waveform ishoma pane chiratidzo chehupamhi T, zvinoreva kuti chiratidzo chemagetsi chinogara chichidzokera kune zero nguva isati yapera chiratidzo, sezvakaratidzwa mumufananidzo 6-1 (c). ).kuratidza. Kazhinji, iyo yekudzoka-ku-zero waveform inoshandisa hafu-yebasa kodhi, kureva, iyo duty cycle (T / TB) i50%, uye ruzivo rwenguva runogona kutorwa zvakananga kubva kune unipolar RZ waveform. shanduko waveform.
zvinoenderana nekudzoka-ku-zero waveform. Iwo unipolar uye bipolar waveforms ari pamusoro ndeasiri-kudzoka-ku-zero (NRZ) masaisai ane duty cycle ye.
4.Bipolar kudzoka-ku-zero waveform
Ndiyo yekudzoka-ku-zero fomu yebipolar waveform, sezvakaratidzwa mumufananidzo 6-1 (d). Inosanganisa hunhu hwebipolar uye kudzoka-kune-zero waveforms. Nekuti pane zero inogona kupindirana pakati pemapurusi ari padyo, mugamuchiri anogona kuona zviri nyore kutanga nekupera kwechiratidzo chega chega, kuitira kuti anotumira uye anogamuchira vagone kuchengetedza kwakaringana bit synchronization. Iyi mukana inoita bipolar nulling waveforms inobatsira.
5. Musiyano waveform
Rudzi urwu rwemasaisai rwunoburitsa meseji neshanduko uye shanduko yedanho rechiratidzo chiri padyo, zvisinei nekugona kana polarity yechiratidzo pachayo, sezvakaratidzwa mumufananidzo 6-1(e). Mumufananidzo, "1" inomiririrwa nekusvetuka nhanho, uye "0" inomiririrwa nenhanho isina kuchinjwa. Zvechokwadi, gadziriro dziri pamusoro apa dzinogonawo kuchinjwa. Sezvo iyo mutsauko waveform inomiririra meseji nekuchinja kwehukama kweiyo padhuze pulse mazinga, inonziwo hama kodhi waveform uye zvimwechetezvo, inotangira unipolar kana bipolar waveform inonzi iyo absolute kodhi waveform. Kushandisa mutsauko waveforms kutumira mameseji kunogona kubvisa mhedzisiro yemamiriro ekutanga echishandiso, kunyanya muchikamu modulation masisitimu. Inogona kushandiswa kugadzirisa dambudziko remutakuri wechikamu kusanzwisisika.
6. Multi-level waveform
Pane mazinga maviri chete emafungu ari pamusoro apa, kureva kuti, chiratidzo chebhinari chinoenderana nekupuruzira kumwe. Kuti uvandudze frequency band kushandiswa, iyo yakawanda-level waveform kana yakawanda-value waveform inogona kushandiswa. Mufananidzo. multi-level waveform inoshandiswa mune yakakwirira-kumhanya data data system ine mashoma frequency mabhendi. Sezvo imwe pulse yeakawanda-level waveform inoenderana neakawanda mabhinari macode, chiyero chebhiti chinowedzerwa pasi pemamiriro eiyo imwechete baud rate (same transmission bandwidth). Rave richishandiswa zvakafara.
Izvo zvinofanirwa kucherechedzwa kuti waveform yeimwe pulse inomiririra chiratidzo cheruzivo haingove rectangular. Zvinoenderana nezvinodiwa chaizvo uye mamiriro echiteshi, mamwe mafomu akadai seGaussian pulse, akasimudza cosine pulse, nezvimwe zvinogona kushandiswa zvakare. Asi zvisinei kuti rudzii rweiyo waveform inoshandiswa, dhijitari baseband chiratidzo chinogona kumiririrwa nemasvomhu. Kana masaisai anomiririra zviratidzo akafanana asi nhanho dzenhanho dzakasiyana.
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