TD n°2: Modulation/Démodulation analogique
Transcription
TD n°2: Modulation/Démodulation analogique
TD n°2: Modulation/Démodulation analogique ( ( ( )( ( > $ # +01 ! " ! # % #! #& # " '( = ) # ( π ) * " + , -./*# ! # ./ " 2 34 # ! " ! # *" 5 6 / ! ## #& 0#'( 7 /! 0 #0 ' ! ( ! # & '! 0 # / # " ( 7 / #! #& !0 # # ! ## # # #' #0 # " ( $ # ! &0 0 !+ 8& 90 & *# " !+ 8& + : % 1 #& 0 !+ 8 ;< 8 " 2 4* / #! + # # !+ # '& & # ( $ # & # " ! 0 # !+ 8 ;<* " 0 = # ( π ) *# # " # " ε "# = R 6 : ( ? # 1 ( D 1 34 C ( : % 1 < %@! %A# & + ! = !# Vc ! + B 7! C # = 1 4 8 " # 2 " − = = ) #( π / ! ## & )− * !0 # / " E $ ! 4&# ++,= 4 E6: ,3 ( D !# / ! & ! !+ 8& + " ( D 0 #& * ( ( E0 # / # %0 00 ( ? ## # + ! E , $% # 0 0 8 8 !0 # #! #" # # 00 C D0 # / # " #! 0# # E# $% ( '! #@# A $% F " #0 9 #! !! # # 0& %1 ' ( ;+ " ! ## @ 0 * : % 1 ! !! + ! 01 # = + + 1 = .B* / ! ## # 0 " #& 0# # + '( = + # (ω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π ! +01 ! # 8 # ;$D ( D 0!% # & #& * # # # & # " R1 R1 " = "# R > C 60 ! : 0 / + #+ # 0 A % # E # 1 0!% # & # / 0!% # & ! & 8 /=" # ! # # # #@# A C D #& 0!% #0# π * # # 0 # 1 # # %0 ! 0 0 sm(t) ! )( ! 0 / +, 6 " +01 & ? # MN O8 -./* ./ J./ ? & # " 200Hz 1660Hz 20000Hz S’m(t) 50Hz 600Hz 4850Hz S ’’m(t) + ω 0!% # & # #& ./* J%/ J./ 0 #0 # 0 %0 # %0 0 0 ! !% # θ # # /= ! # # 0 # * # 0 !"# $ # % 0 # ( 6 ! ## #& 0# # P ( D &0 0 #& 6 ;D #& # # 0 ! #@# A " & 8 # " RL vp(t) Vd ! Q L R vs(t) C m(t) Vdc ( !1 / 9 % 1 00 0 # 1 ( 8 + #+ ! ## " # ! ! " 0 # C ( ! ## #& # # # 0# + % L $ # !! # 1 8 +01 ! # '(, > 4 > 4 ? %@! %A# M + 0& 0 ? " # /