Mabaadiida aasaasiga ah ee radio

In 1887 godu Genrih Gerts muujiyeen in tamarta electromagnetic loo soo diri karaa meel sidii hirarka raadiyaha, taas oo dhex mari jawiga oo ku saabsan xawaaraha iftiinka. daahfurka Tani waxay caawisay horumarinta mabaadi'da radio in ay yihiin maanta. Waxaa intaa dheer, saynisyahano ayaa cadeeyay in hirarka radio waa electromagnetic ee dabiiciga ah, laakiin ay feature ugu muhiimsan - waa inta jeer ee taas tamarta kala duwan beeraha korontada iyo magnetic. Joogtaynta in Hertz (Hz) la xiriira λ Milanello, taas oo ah masaafada oo la ruxruxo radio a maraa inta lagu jiro mid ka mid oscillation. Sayidka, formula soo socda: λ = C / F (meesha C yahay xawaaraha iftiinka).

Mabaadi'da ku salaysan yihiin gudbinta radio ee hirarka radio macluumaad-waday. Waxay u gudbin kartaa cod ama data digital. Si taas loo gaaro, Idaacadda waa in:

- Device for ururinta macluumaadka galay signal koronto (tus, makarafoon). signal Tan waxaa lagu magacaabaa band a noqnoqoshada aasaasiga ah ee kala duwan ee caadiga ah audio.

- macluumaad modulator galaya in bandwidth signal ee la soo xulay ee soo noqnoqoshada radio.

- A gudbiye kordhiyo awoodda waa signal a kaas oo u soo diro si anteeno.

- antenna The ushii koronto tabinta dherer gaar ah, kaas oo dhaadheer doonaa hirarka radio electromagnetic.

- signal kordhiyo dhinaca qadanayo.

- demodulator, taas oo ay awoodaan in ay soo kabsadaan xogta asalka ah ka signal raadiyaha helay noqon doonaa.

- Ugu dambeyntii, qalab ah tarmo macluumaadka la isku qaadsiiyo (tus, Gudoomiyaha a).

mabaadi'da radio

Mabda'a casriga ah ee raadiyaha lagu uuraysan bilowga ah ee qarnigii la soo dhaafay. Iyadoo radio loogu talagalay ugu horeyn loogu talagalay cod iyo music. Laakiin aad ugu dhakhsaha badan fursad u leeyihiin inay isticmaalaan mabaadi'da isgaarsiinta raadiyaha for gudbinta xogta dheeraad ah oo adag. Tusaale ahaan, sida qoraalka. Tani waxay keentay in la alifay ee code telegaraafka ah.

Common codka, music ama telegaraafka waa in macluumaadka ugu muhiimsan waxaa Windows XP in ay signalada dhawaaqa, lagu gartaa Ilodanimada inayan iyo inta jeer (Hz). Aadanuhu maqli karaan dhawaqyada kala duwan ka 30 Hz ku saabsan 12,000 Hz. kala duwan Tan waxaa lagu magacaabaa spectrum ku dhawaaqa.

spectrum inta jeer ee radio wuxuu u qaybsan yahay kala duwan guutooyin soo noqnoqoshada. Mid kasta oo iyaga ka mid ah waxay leedahay astaamo u gaar ah marka la eego ay warshadu hawada iyo suuska in jawiga. Waxaa la go'doonsan sida ku cad shaxda hoose codsiyada isgaarsiinta ka shaqeeya ee kala duwan siiyey.

Maanta waa ay adag tahay in la qiyaaso waxa ka yeeli lahaa Dadka aan isgaarsiinta raadiyaha, taas oo uu helay codsiga in hindisooyin badan oo casri ah. Tusaale ahaan, mabaadi'da raadiyaha iyo telefishinka waxaa loo isticmaalaa in telefoonada gacanta, keyboard, GPRS, Wi-Fi, shabakadaha computer wireless iyo wixii la mid ah.