Kwezwi awo kunye nokuphuculwa kwayo

Iphaneli nayiphi radio mihla iye AM-FM iswitshi. Njengomgaqo, abathengi abaqhelekileyo musa ukucinga ngento yokuba intsingiselo yezi leta, kwanele ukuba ukukhumbula ukuba FM ekuthanda isikhululo yakhe radio FM leyo usasaza istereo kunye nomgangatho entle, kwaye AM uyakwazi ukubamba i "Lighthouse". Ukuba sifumana kwiinkcukacha zobuchwepheshe ubuncinane kwinqanaba lomsebenzisi ngesandla, uya kufumanisa ukuba i-AM - i kwezwi awo kunye FM - rhoqo. Zahlukene njani?

Ukuze ixilongo kwesithethi umculo radio uphawu isandi kufuneka ukuba lenziwe iinguqulelo. Kwindawo yokuqala oko kufuneka kwenziwe ezifanelekileyo zosasazo kunomathotholo. kwezwi awo yindlela yokuqala, signalers, iinjineli bafunda ukuze adlulisele iinkqubo ilizwi nomculo emoyeni. American Fessenden ngo-1906, ngoncedo mechanical oscillation wokuphehla 50 kHz, yaba yeyokuqala kwimbali njalo yenethiwekhi. Okulandelayo wagqiba ekubeni ingxaki yezobuchwepheshe ngendlela elula, ngokumisela coil umbhobho kwimveliso. Phantsi yempembelelo amaza omsindo kwi umgubo carbon ngaphakathi zeenkomo yatshintsha ukuqina kwayo, yaye ubukhulu isiginali ukusuka wenkunkuma ukuya eriyali yokusasaza, ukuncipha okanye anda kuxhomekeka kubo. Ekubeni kwezwi awo sele kwemoto, utshintsho ngamanye xa awo yomqondiso yenethiwekhi ukwenzela ukuba zenze umgca imvulophu ingqinelana ukuya imilo yomqondiso ngesondo. Kule eko, umbane mechanical zaye indawo yi electron-isibane. Oku kunciphisa kakhulu ubukhulu kunye nobunzima zidlulisele.

Frequency kwezwi yohlukile awo ukuze imihlaba lencinibakazi carrier kuhlala rhoqo, ukutshintsha rhoqo yayo. Njengoko isiseko kunye busebenze elektroniki kukho ezinye iindlela apho uphawu ingcaciso "kuhlala" kwi amaza omoya erediyo. Isigaba utshintsho noncedo inkululeko wanikwa igama lesigaba kunye ukubetha nobubanzi kwezwi. Kwakubonakala ukuba Painter radio zosasazo njengendlela yokuphuma umhla. Kodwa izinto zabahambela ngokwahlukileyo, nto iye yaqinisekisa isikhundla sayo, nangona ngohlobo modified.

Nokufuna ingcaciso Ukwanda frequency ukukhuthaza iinjineli ukuba ukujonga iindlela ukwandisa inani lamajelo ezosulela neembono ezifanayo. Iimpawu multi-channel losasazo sizimisele theorem Kotel'nikova kunye Nyquist isithintelo, Noko ke, ukongezelela quantization umqondiso, kunokwenzeka ukuba kukwandisa umthwalo data kwi ijelo lonxibelelwano ngokutshintsha isigaba. Quadrature Painter - indlela ukugqithisa ezinjalo, apho frequency inye ethunyelwayo Imiqondiso ezahlukeneyo, isigaba kwatshintsha xa kuthelekiswa bodwa degrees 90. Forms i-isigaba emine okanye yindibaniselwano yeekhomponenti quadrature ezimbini wachaza netrigonometri imisebenzi yesono cos, yiyo igama.

Quadrature Painter ngokubanzi kusetyenziswa kunxibelelwano yedijithali. Ngokwemvelo awo indibanisela kwisigaba kwezwi awo.