Abasebenzisi abaninzi baye baqalisa ukusebenzisa i-digital signal phone, kodwa kwezinye iindawo ezingaphuhliswanga ngokwaneleyo, ifowuni ye-analog isasetyenziswa.Abasebenzisi abaninzi babhidanisa imiqondiso ye-analog kunye neempawu zedijithali.Ke yintoni ifowuni ye-analog?Yintoni umnxeba wedijithali?
Ifowuni ye-analog - Ifowuni ehambisa isandi ngemiqondiso ye-analog.Isignali ye-analog yombane ibhekiselele kwi-amplitude kunye nomqondiso ohambelanayo wombane oqhubekayo, lo mqondiso unokuba yisekethe ye-analog kwimisebenzi eyahlukeneyo, ukunyuka, ukongeza, ukuphindaphinda njalo njalo.Iimpawu ze-analog zikhona kuyo yonke indawo kwindalo, njengokutshintsha kobushushu bemihla ngemihla.
Isignali yedijithali yimbonakaliso yedijithali yesignali yexesha (emelwe ngokulandelelana kwe-1 kunye ne-0), ngokuqhelekileyo ifunyenwe kwisignali ye-analog.
Izinto eziluncedo kunye nokungalunganga kweempawu zedijithali:
1, thatha ibhendi ebanzi.Ngenxa yokuba umgca uhambisa umqondiso we-pulse, ukuhanjiswa kolwazi lwezwi ledijithali kufuneka kuphendule i-20K-64kHz bandwidth, kwaye indlela yezwi ye-analog ithatha kuphela i-4kHz bandwidth, oko kukuthi, i-akhawunti yesignali ye-PCM kwiindlela ezininzi zezwi le-analog.Kwishaneli ethile, izinga lokusetyenziswa kwayo liyancitshiswa, okanye iimfuno zalo zomgca zandisiwe.
I-2, iimfuno zobuchwepheshe zinzima, ngakumbi iteknoloji yokuvumelanisa ifuna ukuchaneka okuphezulu.Ukuqonda ngokuchanekileyo intsingiselo yomthumeli, umamkeli kufuneka ahlule ngokuchanekileyo into nganye yekhowudi, kwaye afumane isiqalo seqela ngalinye lolwazi, efuna umthumeli kunye nomamkeli ukuba baqonde ngokungqongqo ungqamaniso, ukuba ukubunjwa kwenethiwekhi yedijithali, ingxaki yongqamaniso kuba nzima ngakumbi ukusombulula.
I-3, ukuguqulwa kwe-analog / yedijithali kuya kuzisa impazamo ye-quantization.Ngokusetyenziswa kweesekethe ezinkulu ezidibeneyo kunye nokuthandwa kweendaba zokusasazwa kwe-broadband njenge-fiber optical, izibonakaliso ezininzi zedijithali zisetyenziselwa ukugcinwa kolwazi kunye nokuhanjiswa, ngoko ke iimpawu ze-analog kufuneka ziguqulelwe kwi-analog / digital, kwaye iimpazamo ze-quantization ngokuqinisekileyo ziya kudlula. kwenzeke kuguqulo.
Ixesha lokuposa: Feb-05-2024
