Lub tswb ceeb toom muaj nuj nqi: Thaum muaj xwm txheej ceev, tsuas yog nias lub tswb nrov ua rau ob lub- xov tooj cua kom tso lub tswb nrov ntawm qhov siab tshaj plaws los yog xa ib qho kev ceeb toom ua ntej - teeb tsa lub tswb mus rau lwm lub xov tooj ntawm tes lossis chaw nres tsheb hauv paus, yog li ua kom cov lus teb raws sij hawm.
Carrier Wave: Cov neeg nqa khoom nthwv dej ua haujlwm ua qhov nruab nrab kis rau cov teeb liab muaj txiaj ntsig- xws li lub suab, cov ntaub ntawv digital, thiab cov ntaub ntawv qhia. Nws siv high - zaus electromagnetic nthwv dej, uas pab txhawb kev sib kis tau zoo ntawm cov teeb liab hla kev deb. Thaum lub sijhawm kev hloov kho, cov ntaub ntawv xav tau yog encoded mus rau tus neeg nqa khoom nthwv dej los ntawm kev hloov nws cov kev txwv tshwj xeeb -xws li nws qhov amplitude (AM), zaus (FM), lossis theem (PM).
Channel Spacing: Nyob rau hauv cov ntsiab lus ntawm kev sib txuas lus, "channel" yog hais txog qhov tshwj xeeb ntau zaus nyob hauv lub sijhawm sib kis thiab txais cov teeb liab. Qhov sib txawv ntawm qhov sib txawv ntawm cov channel uas nyob ib sab hu ua "channel spacing," ib qho tseem ceeb rau kev ruaj ntseg thiab kev sib txuas lus zoo. Cov qauv zoo sib xws rau qhov sib txawv ntawm cov channel muaj xws li 25 kHz (wideband) nrog rau 20 kHz thiab 12.5 kHz (narrowband).
Scrambling Function: Scrambling yog lub suab encryption thev naus laus zis tsim los ua kom muaj kev nyab xeeb thiab ceev ntiag tug ntawm kev sib tham. Feem ntau, ob tog koom nrog hauv kev hu xov tooj yuav ua rau muaj kev sib tsoo kom tsis txhob muaj peev xwm eavesdropping los ntawm lwm yam ob - xov tooj cua ua haujlwm ntawm tib zaus.
