📄 am_sys4.mdl
字号:
Block {
BlockType Scope
Name "下边带信号"
Ports [1, 0, 0, 0, 0]
Position [465, 160, 495, 190]
ForegroundColor "green"
FontName "宋体"
FontSize 12
Floating off
Location [69, 158, 400, 472]
Open off
NumInputPorts "1"
TickLabels "OneTimeTick"
ZoomMode "on"
List {
ListType AxesTitles
axes1 "%<SignalLabel>"
}
Grid "on"
TimeRange "1.000000"
YMin "-2"
YMax "2"
SaveToWorkspace off
SaveName "ScopeData"
DataFormat "Matrix"
LimitMaxRows on
MaxRows "5000"
Decimation "1"
SampleInput off
SampleTime "0"
}
Block {
BlockType SignalGenerator
Name "信号发生器\n频率（弧度/秒）"
Position [60, 58, 105, 92]
ForegroundColor "green"
FontName "宋体"
FontSize 12
WaveForm "sine"
Amplitude "1.000000"
Frequency "10.000000"
Units "rad/sec"
}
Block {
BlockType TransportDelay
Name "移\n相"
Position [217, 120, 263, 150]
Orientation "down"
FontName "宋体"
FontSize 12
DelayTime "0.25/(W/(2*pi))"
InitialInput "0"
BufferSize "1024"
MaskType "90度移相"
MaskDescription "90度移相"
MaskPromptString "输入信号的角频率（Rad/s）："
MaskStyleString "edit"
MaskTunableValueString "on"
MaskEnableString "on"
MaskVisibilityString "on"
MaskInitialization "W=@1;"
MaskDisplay "disp('90度')"
MaskIconFrame on
MaskIconOpaque on
MaskIconRotate "none"
MaskIconUnits "autoscale"
MaskValueString "10"
}
Block {
BlockType TransportDelay
Name "移\n相\n1"
Position [162, 120, 208, 150]
Orientation "down"
NamePlacement "alternate"
FontName "宋体"
FontSize 12
DelayTime "0.25/(W/(2*pi))"
InitialInput "0"
BufferSize "1024"
MaskType "90度移相"
MaskDescription "90度移相"
MaskPromptString "输入信号的角频率（Rad/s）："
MaskStyleString "edit"
MaskTunableValueString "on"
MaskEnableString "on"
MaskVisibilityString "on"
MaskInitialization "W=@1;"
MaskDisplay "disp('90度')"
MaskIconFrame on
MaskIconOpaque on
MaskIconRotate "none"
MaskIconUnits "autoscale"
MaskValueString "100"
}
Block {
BlockType Sin
Name "载波"
Position [70, 125, 90, 145]
ForegroundColor "green"
FontName "宋体"
FontSize 12
Amplitude "1"
Frequency "100"
Phase "0"
SampleTime "0.001"
}
Line {
SrcBlock "乘法器1"
SrcPort 1
DstBlock "Butterworth\nLP 滤波器"
DstPort 1
}
Line {
SrcBlock "Butterworth\nLP 滤波器"
SrcPort 1
DstBlock "解调信号"
DstPort 1
}
Line {
SrcBlock "信号发生器\n频率（弧度/秒）"
SrcPort 1
Points [130, 0]
Branch {
DstBlock "移\n相"
DstPort 1
}
Branch {
DstBlock "乘法器"
DstPort 1
}
}
Line {
SrcBlock "移\n相\n1"
SrcPort 1
Points [0, 30]
DstBlock "乘法器2"
DstPort 2
}
Line {
SrcBlock "移\n相"
SrcPort 1
Points [0, 20]
DstBlock "乘法器2"
DstPort 1
}
Line {
SrcBlock "加法器"
SrcPort 1
DstBlock "下边带信号"
DstPort 1
}
Line {
SrcBlock "乘法器"
SrcPort 1
Points [15, 0]
Branch {
DstBlock "减法器"
DstPort 1
}
Branch {
Points [0, 90]
DstBlock "加法器"
DstPort 1
}
}
Line {
SrcBlock "乘法器2"
SrcPort 1
Points [25, 0]
Branch {
DstBlock "加法器"
DstPort 2
}
Branch {
Points [0, -90]
DstBlock "减法器"
DstPort 2
}
}
Line {
SrcBlock "减法器"
SrcPort 1
Points [35, 0]
Branch {
DstBlock "上边带信号"
DstPort 1
}
Branch {
Points [0, 140; -270, 0; 0, 45]
DstBlock "乘法器1"
DstPort 1
}
}
Line {
SrcBlock "载波"
SrcPort 1
Points [35, 0]
Branch {
Points [0, -50; 55, 0]
Branch {
DstBlock "乘法器"
DstPort 2
}
Branch {
DstBlock "移\n相\n1"
DstPort 1
}
}
Branch {
Points [0, 145]
DstBlock "乘法器1"
DstPort 2
}
}
Annotation {
Position [278, 318]
VerticalAlignment "top"
Text "同步解调"
FontName "宋体"
FontSize 12
}
Annotation {
Position [218, 283]
VerticalAlignment "top"
Text "导频信号"
FontName "宋体"
FontSize 12
}
Annotation {
Position [203, 253]
VerticalAlignment "top"
Text "上边带 SSB"
FontName "宋体"
FontSize 12
}
Annotation {
Position [153, 208]
VerticalAlignment "top"
Text "发送端"
FontName "宋体"
FontSize 12
}
Annotation {
Position [148, 288]
VerticalAlignment "top"
Text "接收端"
FontName "宋体"
FontSize 12
}
Annotation {
Position [78, 163]
VerticalAlignment "top"
ForegroundColor "green"
Text "cos ( Wc * t + p )\nWc 载波角频率\np 载波初始相"
"位"
FontName "宋体"
FontSize 12
}
Annotation {
Position [418, 48]
VerticalAlignment "top"
ForegroundColor "green"
Text "已调 SSB 信号"
FontName "宋体"
FontSize 12
}
Annotation {
Position [143, 58]
VerticalAlignment "top"
ForegroundColor "green"
Text "X(t)"
FontName "宋体"
FontSize 12
}
Annotation {
Position [83, 38]
VerticalAlignment "top"
ForegroundColor "green"
Text "调制信号"
FontName "宋体"
FontSize 12
}
Annotation {
Position [68, 223]
VerticalAlignment "top"
ForegroundColor "green"
Text "对 SSB 信号，无法\n直接从其中提取参考\n信号，故"
"发送端在发\n射 SSB 信号的同时，\n还须发射受到一定程\n度抑制的载波信号。\n（称"
"为导频信号）"
FontName "宋体"
FontSize 12
}
Annotation {
Position [268, 18]
VerticalAlignment "top"
Text "同步调制/解调 AM 系统 （ 单边带 SSB ）—— 移相"
"法"
FontName "宋体"
FontSize 12
}
}
}
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