Apply a digital filter (direct form II transposed): Difference between revisions
Apply a digital filter (direct form II transposed) (view source)
Revision as of 19:12, 24 December 2019
, 4 years ago→{{header|Java}}
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Line 485:
0.651771
</pre>
=={{header|Groovy}}==
{{trans|Java}}
<lang groovy>class DigitalFilter {
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 = [1.00000000, -2.77555756e-16, 3.33333333e-01, -1.85037171e-17] as double[]
double[] b = [0.16666667, 0.5, 0.5, 0.16666667] as double[]
double[] signal = [
-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
] as double[]
double[] result = filter(a, b, signal)
for (int i = 0; i < result.length; ++i) {
printf("% .8f", result[i])
print((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|Java}}==
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