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我不知道怎么上传附件,只好把程序粘贴了过来。界面的话根据程序自设吧,要改函数在最后。
- Dim FUZHI(255), PINZHIr(255), PINZHIi(255), PINZHI(255) As Double
- Dim TU_DATA(2047) As Integer
- Dim P_START, I_TIME, P_POINT As Integer
- Dim PAI, A1, A2, A3, S1, S2, S3 As Double
- Dim fr(7, 255) As Double
- Dim fi(7, 255) As Double
- Dim Shuxu(255) As Integer
- Dim TX As Integer
- Private Sub Command1_Click()
- '启动,设置初始值
- I_TIME = 0
- P_START = 0
- Picture1(0).Cls
- Picture1(1).Cls
- Picture1(0).Visible = True
- Picture1(0).Line (6400, 1200)-(0, 1200), RGB(255, 0, 0)
- Timer1.Enabled = True
- End Sub
- Private Sub Command2_Click()
- End
- End Sub
- Private Sub Command3_Click()
- '频谱图形显示方式
- TX = (TX + 1) Mod 2
- End Sub
- Private Sub Form_Load()
- TX = 0
- PAI = 3.14159
- Timer1.Enabled = False
- '加权系数W
- For i = 0 To 7
- For j = 0 To 2 ^ i - 1
- aa = Cos(2 * PAI * j / 2 ^ (i + 1))
- Call ZHENG(aa)
- fr(i, j) = aa
- fr(i, j + 2 ^ i) = -aa
- bb = Sin(2 * PAI * j / 2 ^ (i + 1))
- Call ZHENG(bb)
- fi(i, j + 2 ^ i) = bb
- fi(i, j) = -bb
- Next j
- Next i
- '倒序
- For i = 0 To 255
- Shuxu(i) = 0
- For j = 0 To 7
- a = i And (2 ^ (7 - j))
- If a > 0 Then a = 1
- Shuxu(i) = Shuxu(i) + a * (2 ^ j)
- Next j
- Next i
- Label12.Caption = "截止窗" + Str(Int((HScroll6.Value / 256) * 100) / 100)
- End Sub
- Private Sub HScroll1_Change()
- '合成谐波信号的频率
- A1 = HScroll1.Value / 2
- Label5.Caption = A1
- End Sub
- Private Sub HScroll2_Change()
- '合成谐波信号的相位
- S1 = HScroll2.Value * PAI / 180
- Label6.Caption = HScroll2.Value
- End Sub
- Private Sub HScroll3_Change()
- '合成谐波信号的频率
- A2 = HScroll3.Value / 2
- Label7.Caption = A2
- End Sub
- Private Sub HScroll4_Change()
- '合成谐波信号的相位
- S2 = HScroll4.Value * PAI / 180
- Label8.Caption = HScroll4.Value
- End Sub
- Private Sub HScroll6_Change()
- Label12.Caption = "截止窗" + Str(Int((HScroll6.Value / 256) * 100) / 100)
- End Sub
- Private Sub HScroll7_Change()
- '合成谐波信号的相位
- S3 = HScroll7.Value * PAI / 180
- Label18.Caption = HScroll7.Value
- End Sub
- Private Sub HScroll8_Change()
- '合成谐波信号的频率
- A3 = HScroll8.Value / 2
- Label19.Caption = A3
- End Sub
- Private Sub Timer1_Timer()
- Call shuju
- P_POINT = I_TIME Mod 256
- FUZHI(P_POINT) = TU_DATA(I_TIME) / 100
- If I_TIME > 255 Then Call FFT 'begin FFT
- If P_START = 0 Then Picture1(0).PSet (0, 1200 - TU_DATA(I_TIME))
- If P_START <= 256 Then Picture1(0).Line -(P_START * 25, 1200 - TU_DATA(I_TIME)), RGB(128, 255, 2550)
- If P_START > 256 Then P_START = 256: Call pic_draw
- I_TIME = (I_TIME + 1) Mod 2048
- P_START = P_START + 1
- End Sub
- Private Sub FFT()
- Dim H(255), G(255) As Double
- '将采集数据按倒序结果赋值
- For i = 0 To 255
- kk = (Shuxu(i) + P_POINT + 1) Mod 256
- PINZHIr(i) = FUZHI(kk)
- PINZHIi(i) = 0
- Next i
- 'FFT
- For k = 0 To 7 '变换次数:8次*256
- Ai = 2 ^ k
- For i = 0 To 2 ^ (7 - k) - 1 '分组的组个数:128、64、32、16、8、 4、 2、 0
- Bi = 2 * i * Ai
- For j = 0 To 2 ^ (k + 1) - 1 '每组数据个数:2、 4、 8、16、32、64、128、256
- Ci = Bi + j
- If j < Ai Then
- H(Ci) = PINZHIr(Ci) + fr(k, j) * PINZHIr(Ci + Ai) - fi(k, j) * PINZHIi(Ci + Ai)
- G(Ci) = PINZHIi(Ci) + fi(k, j) * PINZHIr(Ci + Ai) + fr(k, j) * PINZHIi(Ci + Ai)
- Else
- H(Ci) = PINZHIr(Ci - Ai) + fr(k, j) * PINZHIr(Ci) - fi(k, j) * PINZHIi(Ci)
- G(Ci) = PINZHIi(Ci - Ai) + fr(k, j) * PINZHIi(Ci) + fi(k, j) * PINZHIr(Ci)
- End If
- Next j
- Next i
- For w = 0 To 255
- PINZHIr(w) = H(w)
- PINZHIi(w) = G(w)
- Next w
- Next k
- Picture1(1).Cls
- Picture1(1).PSet (0, 2300)
- For j = 0 To 127
- PINZHI(j) = (PINZHIr(j) * PINZHIr(j) + PINZHIi(j) * PINZHIi(j)) ^ 0.5
- Call ZHENG(PINZHI(j))
- If TX = 0 Then Picture1(1).Line -(100 * j, 2300 - PINZHI(j) * 5), RGB(255, 0, 0)
- If TX = 1 Then Picture1(1).Line (100 * j, 2300)-(100 * j, 2300 - PINZHI(j) * 5), RGB(255, 0, 0)
- Next j
- '横坐标点
- For j = 0 To 12
- Picture1(1).Circle (j * HScroll6.Value * 1000 / 256, 2300), 20, RGB(255, 0, 0)
- Next j
- End Sub
- Private Sub pic_draw()
- Picture1(0).Cls
- Picture1(0).Line (0, 1200)-(6400, 1200), RGB(255, 0, 0)
- Picture1(0).PSet (6400, 1200 - TU_DATA(I_TIME))
- For i = 1 To 256
- kk = (I_TIME - i + 2048) Mod 2048
- Picture1(0).Line -(6400 - i * 25, 1200 - TU_DATA(kk)), RGB(128, 255, 2550)
- Next i
- End Sub
- Sub shuju()
- xx2 = 128 / (Int((HScroll6.Value / 256) * 100) / 100)
- xx = 3 * Sin(A1 * PAI * I_TIME / xx2 + S1) + 2 * Cos(A2 * PAI * I_TIME / xx2 + S2) + Sin(A3 * PAI * I_TIME / xx2 + S3)
- Call ZHENG(xx)
- TU_DATA(I_TIME) = xx * 100
- End Sub
- Sub ZHENG(xx)
- If Abs(xx) < 0.00001 Then xx = 0
- xx = Int(xx * 100000 + 0.5) / 100000
- End Sub
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[ 本帖最后由 风花雪月 于 2008-1-29 15:02 编辑 ] |
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