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SSB vs VSB | Diferans ant SSB ak VSB kalite batman
Paj sa a sou SSB batman vs VSB batman dekri diferans ant SSB ak VSB modulasyon types.It bay lyen DSBSC vs SSBSC.
Anvan nou kòmanse diskisyon nou an, li rekòmande pou konprann konsèp DSB-SC vs SSB-SC ki mansyone diferans ant DSB-SC ak SSB-SC tip modulation. Nan siyal DSB-SC, gen simetri nan estrikti bann. Akòz sa a reyalite menm si se yon mwatye transmèt, lòt mwatye a ka refè nan reseptè a. Akòz sa a, se Pleasant ak pouvwa nan transmisyon redwi a mwatye. Tou depan de ki mwatye nan DSB-SC transmèt gen de kalite SSB batman viz. LSB (Lower Side Band) batman ak USB (Upper Side Band) batman. Menm yo te montre nan figi-2 anba a.
SSB modulation
Jan yo montre nan figi-1, DSB-SC modulatè yo itilize pou SSB siyal jenerasyon. Li se matematik reprezante kòm anba a.
= m (t) * cos (wc * t) +/- m ^ (t) * peche (wc * t)
Siyal orijinal la jwenn lè l sèvi avèk demodulasyon aderan SSB. (SSB (t) miltipliye ak kos (Wc * t) epi pase atravè fil pase ki ba pou retounen siyal orijinal la.
(SSB (t) * Cos (Wc * t) = 1/2 m (t) + 1/2 kosinis (2 * Wc * t) +/- 1/2 m ^ (t) * peche (2 * Wc * t )
Siyal la demodule pase nan yon LPF yo retire vle SSB.
VSB modulation
Sa yo se dezavantaj yo de SSB génération siyal:
-Generasyon nan siyal SSB se difisil.
-Se selektif filtraj fè pou retounen siyal orijinal la.
-Faz shifter yo ta dwe 90 degre egzakteman.
Simonte tout bagay sa yo dezavantaj SSB batman, VSB batman ki itilize. Pakonsekan VSB se konsidere kòm yon konpwomi ant SSB ak DSB-SC.
Nan VSB batman:
• Yon sèl band pa rejte konplètman.
• Yon sèl band transmèt konplètman epi yon ti pati (sa vle di vestij) nan lòt band la transmèt. Pakonsekan Pleasant isit la se BWv = B + v, kote v se bann frekans vestigial.
Figi-3 pentire VSB siyal jenerasyon. Hi (w) se yon filtè ki fòme lòt bann la.
Refè siyal orijinal la nan siyal VSB a, siyal VSB la miltipliye avèk kos (Wc * t) epi li pase nan yon siyal Low Pass Filter (LPF). Fè sa, se siyal orijinal la refè.
Si ou vle achte nenpòt euipments FM / TV pou difize, tanpri ou lib pou kontakte nou pa Imèl: [imèl pwoteje].?