Apply a digital filter (direct form II transposed): Difference between revisions
Apply a digital filter (direct form II transposed) (view source)
Revision as of 17:04, 7 July 2018
, 5 years ago→{{header|D}}
Line 203:
{{out}}
<pre>-0.152974,-0.435258,-0.136043,0.697503,0.656445,-0.435483,-1.08924,-0.537677,0.51705,1.05225,0.961854,0.69569,0.424356,0.196262,-0.0278351,-0.211722,-0.174746,0.0692584,0.385446,0.651771,</pre>
=={{header|C#|C sharp}}==
{{trans|Java}}
<lang csharp>using System;
namespace ApplyDigitalFilter {
class Program {
private static double[] Filter(double[] a, double[] b, double[] signal) {
double[] result = new double[signal.Length];
for (int i = 0; i < signal.Length; ++i) {
double tmp = 0.0;
for (int j = 0; j < b.Length; ++j) {
if (i - j < 0) continue;
tmp += b[j] * signal[i - j];
}
for (int j = 1; j < a.Length; ++j) {
if (i - j < 0) continue;
tmp -= a[j] * result[i - j];
}
tmp /= a[0];
result[i] = tmp;
}
return result;
}
static void Main(string[] args) {
double[] a = new double[] { 1.00000000, -2.77555756e-16, 3.33333333e-01, -1.85037171e-17 };
double[] b = new double[] { 0.16666667, 0.5, 0.5, 0.16666667 };
double[] signal = new 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
};
double[] result = Filter(a, b, signal);
for (int i = 0; i < result.Length; ++i) {
Console.Write("{0,11:F8}", result[i]);
Console.Write((i + 1) % 5 != 0 ? ", " : "\n");
}
}
}
}</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|D}}==
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