Ulwazi

Ohlelweni lokuxhumana lwedijithali, umamukeli uthola isamba sesiginali edlulisiwe nomsindo wesiteshi. Ukwamukela okuphelele kwamasiginali edijithali ngokususelwe kumbandela “ongcono kakhulu” namathuba amancane ephutha. Amaphutha acatshangelwe kulesi sahluko ikakhulukazi ngenxa yomkhawulo webhendi ...

Umdwebo 6-6 umdwebo we-block wesistimu yokudlulisa isignali ye-digital baseband evamile. Ikakhulukazi yakhiwe yisihlungi sokudlulisa (ijeneretha yesignali yesiteshi), isiteshi, isihlungi sokwamukela, kanye nesinqumo samasampuli. Ukuze kuqinisekiswe ukusebenza okuthembekile nokuhlelekile kwe-o...

Isignali ye-baseband yedijithali iwuhlelo lwamaza kagesi olumelela ulwazi lwedijithali, olungamelwa amazinga ahlukene noma ama-pulses. Kunezinhlobo eziningi zamasignali e-baseband yedijithali (ngemuva kwalokhu okubizwa ngokuthi amasignali e-baseband). Umfanekiso 6-1 ubonisa amaza e-baseband ayisisekelo esignali, ...

Izimpawu zokuvuma zingahlukaniswa zibe amasignali amandla kanye namasignali amandla ngokwamandla azo. Amasignali amandla angahlukaniswa abe amasignali ezikhathi ezithile kanye namasignali aperiodic kuye ngokuthi ayenzeka ngezikhathi ezithile noma cha. Isiginali yamandla inomkhawulo nge-amplitude kanye nobude besikhathi, amandla ayo fi...

Lapho umthamo wokudlulisela wesiteshi esingokoqobo ungaphezu kwesidingo sesiginali eyodwa, isiteshi singabiwa ngamasignali amaningi. Ngokwesibonelo, umugqa womugqa wesimiso socingo ngokuvamile unezinkulungwane zezimpawu ezidluliselwa ngomcu owodwa wokubona. I-Multiplexing ubuchwepheshe obuxazulula...

1) Ikhodi ye-AMI Igama eligcwele lekhodi ye-AMI (Alternative Mark Inversion) enye ikhodi yokuguqula uphawu. blank) ihlala ingashintshiwe. Isb: Ikhodi yomlayezo: 0 1 1 0 0 0 0 0 0 0 0 1 1 0 0 1 1… Ikhodi ye-AMI: 0 -1 +1 0 0 0 0 0 0 0 0 0 -1 +1 0 0 -1 +1… I-waveform ehambisana nekhodi ye-AMI ithi ...