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DSB-SC vs SSB-SC | Diferans ant DSB-SC ak SSB-SC
Paj sa a sou DSB-SC vs SSB-SC dekri diferans ki genyen ant DSB-SC ak SSB-SC tip batman. Li eksplike Basics nan DSBSC ak SSBSC ak mansyone diferans ki itil ant tèm yo. DSB-SC kanpe pou Double SideBand siprime Carrier ak SSB-SC kanpe pou Single SideBand siprime Carrier.
Tou de nan sa yo, se modil modulation yo itilize nan AM (anplitid Module) spectre frekans. Jan yo montre nan figi-1 spectre an AM pote Wc (Carrier), Wc-Wm (Lower Side Band) ak Wc + Wm (Upper Side Band) konpozan siyal.
Fig-1 AM Spekèm
Fig-2 DSBSC transmèter
● Ekwasyon: Carrier: Signal, C (t) = m (t) * cos (Wc * t)
●Siyal enfòmasyon: m (t) = em * ko (Wm * t)
●Sòti nan modulateur: = em * cos (Wm * t) * cos (wc * t)
= (M * Ec / 2) * cos (Wc + Wm) t + (M * Ec / 2) * cos (Wc-Wm) t
Fig-3 DSBSC Resevwar
Enfòmasyon ki nan premye pati nan sa vle di (1/2) m (t) ki se pas ki ba filtre ak ekstrè.
Isit la osilatè lokal la ta dwe gen menm frekans lan ak faz tankou sa yo ki an siyal la frekans konpayi asirans yo itilize nan transmetè la. Pwosesis sa a konnen kòm deteksyon synchrone.
DSB-SC - Double SideBand Siprime Carrier
Fig-4 DSB-SC specttrum
Se DSBSC teknik baton itilize nan sistèm televizyon analogique transmèt enfòmasyon koulè. Li se tou itilize pou transmèt enfòmasyon stereo nan emisyon son FM nan frekans VHF.
SSB-SC - SideBand siprime Carrier
Fig-5 SSB-SC specttrum
SSB filtre yo itilize ekstrè vle bannann pou transmisyon soti nan DSBSC siyal. Mwatye nan pouvwa a bezwen pou transmisyon nan SSB-SC an konparezon ak DSBSC.