Abasebenzisi abaningi ngokwengeziwe baqale ukusebenzisa isignali yedijithaliucingo, kodwa kwezinye izindawo ezingathuthukisiwe ucingo lwesignali ye-analogi lusasetshenziswa kakhulu. Abasebenzisi abaningi badida amasignali e-analog namasignali edijithali. Ngakho-ke iyini ifoni ye-analog? Iyini ifoni yesiginali yedijithali?
Ucingo lwe-analogi - Ucingo oludlulisa umsindo ngamasignali e-analog. Isignali ye-analog kagesi ibhekisela ku-amplitude kanye nesignali kagesi ehambisanayo eqhubekayo, lesi siginali ingaba yisifunda se-analog yemisebenzi ehlukahlukene, ukwanda, ukungeza, ukuphindaphinda njalonjalo. Izimpawu ze-analogi zikhona yonke indawo emvelweni, njengokushintsha kwezinga lokushisa kwansuku zonke.
Isignali yedijithali iwumfanekiso wedijithali wesiginali yesikhathi (emelwe ukulandelana kuka-1 no-0), ngokuvamile etholakala kusignali ye-analog.
Izinzuzo kanye nobubi bezimpawu zedijithali:
1, thatha ibhendi yefrikhwensi ebanzi. Ngoba ulayini udlulisa isignali ye-pulse, ukudluliswa kwedijithaliulwazi lwezwiidinga ukulandisa ngomkhawulokudonsa ongu-20K-64kHz, futhi indlela yezwi le-analog ithatha kuphela umkhawulokudonsa ongu-4kHz, okungukuthi, i-akhawunti yesiginali ye-PCM yezindlela ezimbalwa zezwi le-analog. Esiteshini esithile, izinga lokusetshenziswa kwaso liyehliswa, noma izidingo zaso zolayini ziyakhuphuka.
2, izidingo zobuchwepheshe ziyinkimbinkimbi, ikakhulukazi ubuchwepheshe bokuvumelanisa budinga ukunemba okuphezulu. Ukuze uqonde kahle incazelo yomthumeli, umamukeli kufanele ahlukanise kahle into ngayinye yekhodi, futhi athole isiqalo seqembu ngalinye lolwazi, okudinga ukuthi umthumeli nomamukeli babone ukuvumelanisa, uma ukwakheka kwenethiwekhi yedijithali, inkinga yokuvumelanisa izoba khona. kube nzima kakhulu ukuxazulula.
3, ukuguqulwa kwe-analog/digital kuzoletha iphutha le-quantization. Ngokusetshenziswa kwamasekhethi amakhulu ahlanganisiwe kanye nokuduma kwemidiya yokudlulisa i-broadband njenge-fiber optical, amasignali edijithali ayanda asetshenziselwa ukugcina nokudlulisa ulwazi, ngakho-ke amasignali e-analog kufanele aguqulelwe ku-analog/digital, futhi amaphutha we-quantization nakanjani kwenzeka ekuguqulweni.
Isikhathi sokuthumela: Feb-05-2024
