Nkhani

Zonse ziwiri za chizindikiro ndi phokoso mukulankhulana zitha kuonedwa ngati njira zachisawawa zomwe zimasiyana ndi nthawi. Zomwe zimachitika mwachisawawa zimakhala ndi mawonekedwe osinthika mwachisawawa komanso momwe zimagwirira ntchito nthawi, ndipo zitha kufotokozedwa kuchokera kumitundu iwiri yosiyana koma yogwirizana kwambiri: ① ndondomeko yachisawawa ndi gulu la...

Njira yolankhulirana ndiyo njira imene anthu awiriwa amachitira zinthu limodzi kapena kutumiza mauthenga. 1. Kuyankhulana kwa Simplex, theka-duplex ndi full-duplex Kuyankhulana kwa mfundo ndi mfundo, molingana ndi malangizo ndi nthawi yotumizira uthenga, njira yolankhulirana c...

Mu njira yolumikizirana ya digito, wolandila amalandira kuchuluka kwa siginecha yotumizidwa ndi phokoso lanjira. Kulandila koyenera kwa ma sigino a digito kutengera muyeso "wabwino" wokhala ndi cholakwika chochepa kwambiri. Zolakwa zomwe zafotokozedwa m'mutuwu ndi chifukwa cha kuchepa kwa band ...

Mkuyu 6-6 ndi chipika chithunzi cha mmene digito baseband chizindikiro kufala dongosolo. Imapangidwa makamaka ndi fyuluta yopatsira (chopanga chizindikiro cha tchanelo), tchanelo, zosefera zolandirira alendo, ndi chosankha chazitsanzo. Pofuna kuonetsetsa kuti ntchito yodalirika ndi yadongosolo...

Chizindikiro cha baseband cha digito ndi mawonekedwe amagetsi omwe amayimira chidziwitso cha digito, chomwe chitha kuyimiridwa ndi magawo osiyanasiyana kapena ma pulses. Pali mitundu yambiri yamasigino amtundu wa digito (omwe amatchedwanso ma sign a baseband). Chithunzi 6-1 chikuwonetsa ma waveforms ochepa a baseband, ...

Zizindikiro zovomerezeka zimatha kugawidwa muzizindikiro zamphamvu ndi zizindikiro zamphamvu molingana ndi mphamvu zawo. Zizindikiro za mphamvu zimatha kugawidwa m'magulu a periodic ndi ma aperiodic sign molingana ndi nthawi kapena ayi. Chizindikiro champhamvu chimakhala chocheperako komanso nthawi yayitali, mphamvu zake ndi ...