|
马上注册,结交更多好友,享用更多功能,让你轻松玩转社区。
您需要 登录 才可以下载或查看,没有账号?我要加入
x
小弟不会编程,故在网上找,但只有源代码。我看我老师做的好象随便什么函数都可以的。
拜托高人能帮我把程序注释一下,解释一下这样编程的原理更好。如果能加上已编好的样例程序那就完美了。
程序如下:
'*模块********************************************************
'FFT0 数组下标以0开始 FFT1 数组下标以1开始
'AR() 数据实部 AI() 数据虚部
'N 数据点数,为2的整数次幂
'NI 变换方向 1为正变换,-1为反变换
'***************************************************************
Public Const Pi = 3.1415926
Public Function FFT0(AR() As Double, AI() As Double, N As Integer, ni As Integer)
Dim i As Integer, j As Integer, k As Integer, L As Integer, M As Integer
Dim IP As Integer, LE As Integer
Dim L1 As Integer, N1 As Integer, N2 As Integer
Dim SN As Double, TR As Double, TI As Double, WR As Double, WI As Double
Dim UR As Double, UI As Double, US As Double
M = NTOM(N)
N2 = N / 2
N1 = N - 1
SN = ni
j = 1
For i = 1 To N1
If i < j Then
TR = AR(j - 1)
AR(j - 1) = AR(i - 1)
AR(i - 1) = TR
TI = AI(j - 1)
AI(j - 1) = AI(i - 1)
AI(i - 1) = TI
End If
k = N2
While (k < j)
j = j - k
k = k / 2
Wend
j = j + k
Next i
For L = 1 To M
LE = 2 ^ L
L1 = LE / 2
UR = 1#
UI = 0#
WR = Cos(Pi / L1)
WI = SN * Sin(Pi / L1)
For j = 1 To L1
For i = j To N Step LE
IP = i + L1
TR = AR(IP - 1) * UR - AI(IP - 1) * UI
TI = AI(IP - 1) * UR + AR(IP - 1) * UI
AR(IP - 1) = AR(i - 1) - TR
AI(IP - 1) = AI(i - 1) - TI
AR(i - 1) = AR(i - 1) + TR
AI(i - 1) = AI(i - 1) + TI
Next i
US = UR
UR = US * WR - UI * WI
UI = UI * WR + US * WI
Next j
Next L
If SN <> -1 Then
For i = 1 To N
AR(i - 1) = AR(i - 1) / N
AI(i - 1) = AI(i - 1) / N
Next i
End If
End Function
Public Function FFT1(AR() As Double, AI() As Double, N As Integer, ni As Integer)
Dim i As Integer, j As Integer, k As Integer, L As Integer, M As Integer
Dim IP As Integer, LE As Integer
Dim L1 As Integer, N1 As Integer, N2 As Integer
Dim SN As Double, TR As Double, TI As Double, WR As Double, WI As Double
Dim UR As Double, UI As Double, US As Double
M = NTOM(N)
N2 = N / 2
N1 = N - 1
SN = ni
j = 1
For i = 1 To N1
If i < j Then
TR = AR(j)
AR(j) = AR(i)
AR(i) = TR
TI = AI(j)
AI(j) = AI(i)
AI(i) = TI
End If
k = N2
While (k < j)
j = j - k
k = k / 2
Wend
j = j + k
Next i
For L = 1 To M
LE = 2 ^ L
L1 = LE / 2
UR = 1#
UI = 0#
WR = Cos(Pi / L1)
WI = SN * Sin(Pi / L1)
For j = 1 To L1
For i = j To N Step LE
IP = i + L1
TR = AR(IP) * UR - AI(IP) * UI
TI = AI(IP) * UR + AR(IP) * UI
AR(IP) = AR(i) - TR
AI(IP) = AI(i) - TI
AR(i) = AR(i) + TR
AI(i) = AI(i) + TI
Next i
US = UR
UR = US * WR - UI * WI
UI = UI * WR + US * WI
Next j
Next L
If SN <> -1 Then
For i = 1 To N
AR(i) = AR(i) / N
AI(i) = AI(i) / N
Next i
End If
End Function
Private Function NTOM(N As Integer) As Integer
Dim ND As Double
ND = N
NTOM = 0
While (ND > 1)
ND = ND / 2
NTOM = NTOM + 1
Wend
End Function
'*使用**********
Const fftIn = 128
Dim i As Integer
Dim xr(128) As Double
Dim xi(128) As Double
'赋值,IaIn(i)是采得的数据。
For i = 0 To 128
xr(i) = 100 * IaIn(i)
xi(i) = 0
Next
'FFT变换
Call FFT0(xr(), xi(), 128, 1)
'绘图
picI_FFT.Scale (0, 100)-(fftIn - 1, -10)
picI_FFT.DrawWidth = 2
For i = 0 To fftIn - 1
picI_FFT.Line (i, Abs(xr(i)))-(i + 1, Abs(xr(i + 1))), vbBlue
Next i |
|