Video: PSK thiab FSK yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Amplitude-hloov keying (ASK), zaus-hloov keying ( FSK ), thiab theem-hloov keying ( PSK ) yog digital modulation schemes. FSK yog hais txog ib hom kev hloov kho zaus uas muab cov nqi me ntsis rau cov theem tsis sib xws. FSK muab faib ua noncoherent thiab coherent forms.
Ntawm no, qhov twg zoo dua PSK lossis FSK?
Raws li koj hais hauv koj cov lus, PSK signals muaj ntau bandwidth npaum, tab sis FSK cov teeb liab muaj suab nrov tsis lees paub rau lawv cov ntaub ntawv tus nqi. BER nkhaus ntawm qhov siab dua PSK hom (piv txwv li 8- PSK ), txawm li cas los xij, ua rau mob hnyav dua vim tias cov cim nyob ze ua ke, yog li xav tau ntau lub zog kom paub qhov txawv ntawm lawv lub suab nrov.
Ib yam li ntawd, cov ntawv thov ntawm PSK yog dab tsi? Nws yog dav siv rau wireless LANs, RFID thiab Bluetooth kev sib txuas lus. Txhua qhov kev hloov pauv digital siv ib tug finite tus naj npawb ntawm cov teeb liab sib txawv los sawv cev cov ntaub ntawv digital. PSK siv tus naj npawb finite ntawm theem, txhua tus muab tus qauv tshwj xeeb ntawm tus lej binary. Feem ntau, txhua theem encodes sib npaug ntawm cov khoom.
Hais txog qhov no, PSK txhais li cas?
Phase-hloov keying ( PSK ) yog ib qho kev hloov pauv digital raws li kev hloov pauv, lossis kev hloov pauv, thawj theem ntawm cov teeb liab nqa khoom. PSK yog siv los sawv cev cov ntaub ntawv digital, xws li binary lej xoom (0) thiab ib (1).
Dab tsi yog qhov zoo sib xws ntawm PSK thiab ASK?
Nkag mus
| Tsis muaj | NUG | PSK |
|---|---|---|
| Cov yam ntxwv sib txawv | Amplitude | Theem |
| Bandwidth | Yog proportional to signal rate (B =(1+d)S), d yog vim modulation & filtering, lies ntawm 0 & 1. | B = (1+d) × S |
| Suab nrov tiv thaiv | qis | Siab |
| nyuaj | Yooj yim | Yooj yim heev |
Pom zoo:
Cell referencing yog dab tsi thiab dab tsi yog qhov sib txawv ntawm kev xa tawm?
Muaj ob hom kev siv ntawm tes: txheeb ze thiab tsis meej. Cov txheeb ze thiab cov ntawv pov thawj tseeb coj txawv txawv thaum theej thiab sau rau lwm lub hlwb.Cov ntaub ntawv txheeb ze hloov thaum tus qauv raug theej rau lwm lub xovtooj. Cov ntaub ntawv tseeb, ntawm qhov tod tes, tseem nyob tas li txawm tias lawv tau theej qhov twg
Social engineering yog dab tsi thiab nws lub hom phiaj yog dab tsi?
Social engineering yog lo lus siv rau ntau yam kev ua phem ua phem uas ua tiav los ntawm tib neeg kev sib cuam tshuam. Nws siv kev puas siab puas ntsws los ntxias cov neeg siv kom ua yuam kev kev ruaj ntseg lossis muab cov ntaub ntawv rhiab
Daim ntawv teev kev sib pauv yog dab tsi thiab nws txoj haujlwm yog dab tsi?
Daim ntawv teev kev lag luam yog cov ntaub ntawv sib txuas ntawm txhua qhov kev hloov pauv hauv cov ntaub ntawv thaum cov ntaub ntawv tiag tiag muaj nyob rau hauv cov ntaub ntawv sib cais. Daim ntawv teev kev lag luam muaj cov ntaub ntawv txaus los tshem tawm tag nrho cov kev hloov pauv tau ua rau cov ntaub ntawv cov ntaub ntawv ua ib feem ntawm ib qho kev sib pauv
Dab tsi yog qhov sib txawv ntawm lub thawv thiab lub thawv ntawv thiab lub thawv ntawv yog dab tsi?
Ib lub thawv thiab cov ntawv nplawm (qee zaum hu ua boxplot) yog ib daim duab uas nthuav tawm cov ntaub ntawv los ntawm tsib lub ntsiab lus. Nyob rau hauv ib lub thawv thiab whisker zajlus: qhov kawg ntawm lub thawv yog lub sab sauv thiab sab quartiles, yog li lub thawv spans lub interquartile ntau yam. qhov nruab nrab yog cim los ntawm ib txoj kab ntsug hauv lub thawv
Dab tsi yog qhov zoo sib xws thiab qhov txawv ntawm relays thiab PLC yog dab tsi?
Relays yog electro-mechanical keyboards uas muaj coil thiab ob hom kev sib cuag uas tsis yog NO & NC. Tab sis Programmable Logic Controller, PLC yog lub khoos phis tawj me uas tuaj yeem txiav txim siab raws li qhov kev zov me nyuam thiab nws cov tswv yim & tso tawm