Apply a digital filter (direct form II transposed): Difference between revisions
Apply a digital filter (direct form II transposed) (view source)
Revision as of 00:49, 29 October 2019
, 4 years ago→{{header|Yabasic}}
(Scala contribution added.) |
|||
Line 1,114:
-0.21172192, -0.17474556, 0.06925841, 0.38544587, 0.65177084
]</pre>
=={{header|Visual Basic .NET}}==
{{trans|C#}}
<lang vbnet>Module Module1
Function Filter(a As Double(), b As Double(), signal As Double()) As Double()
Dim result(signal.Length - 1) As Double
For i = 1 To signal.Length
Dim tmp = 0.0
For j = 1 To b.Length
If i - j < 0 Then
Continue For
End If
tmp += b(j - 1) * signal(i - j)
Next
For j = 2 To a.Length
If i - j < 0 Then
Continue For
End If
tmp -= a(j - 1) * result(i - j)
Next
tmp /= a(0)
result(i - 1) = tmp
Next
Return result
End Function
Sub Main()
Dim a() As Double = {1.0, -0.000000000000000277555756, 0.333333333, -1.85037171E-17}
Dim b() As Double = {0.16666667, 0.5, 0.5, 0.16666667}
Dim signal() As Double = {
-0.917843918645, 0.141984778794, 1.20536903482, 0.190286794412,
-0.662370894973, -1.00700480494, -0.404707073677, 0.800482325044,
0.743500089861, 1.01090520172, 0.741527555207, 0.277841675195,
0.400833448236, -0.2085993586, -0.172842103641, -0.134316096293,
0.0259303398477, 0.490105989562, 0.549391221511, 0.9047198589
}
Dim result = Filter(a, b, signal)
For i = 1 To result.Length
Console.Write("{0,11:F8}", result(i - 1))
Console.Write(If(i Mod 5 <> 0, ", ", vbNewLine))
Next
End Sub
End Module</lang>
{{out}}
<pre>-0.15297399, -0.43525783, -0.13604340, 0.69750333, 0.65644469
-0.43548245, -1.08923946, -0.53767655, 0.51704999, 1.05224975
0.96185430, 0.69569009, 0.42435630, 0.19626223, -0.02783512
-0.21172192, -0.17474556, 0.06925841, 0.38544587, 0.65177084</pre>
=={{header|Yabasic}}==
| |||