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Miha Kralj
2026-01-25 16:01:45 -08:00
parent 2836f253c4
commit e59665c8f0
399 changed files with 6892 additions and 1323 deletions
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lib/filters/bessel/Bessel.cs
+34
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@@ -100,7 +100,9 @@ public sealed class Bessel : AbstractBase
public Bessel(int length)
{
if (length < 2)
{
throw new ArgumentException("Length must be at least 2 for 2nd-order Bessel filter", nameof(length));
}
double a = Math.Exp(-Math.PI / length);
double b = 2.0 * a * Math.Cos(1.738 * Math.PI / length);
@@ -171,7 +173,9 @@ public sealed class Bessel : AbstractBase
public override void Prime(ReadOnlySpan<double> source, TimeSpan? step = null)
{
if (source.Length == 0)
{
return;
}
Reset();
@@ -209,9 +213,13 @@ public sealed class Bessel : AbstractBase
{
double val = source[i];
if (double.IsFinite(val))
{
_state.LastValidValue = val;
}
else
{
val = _state.LastValidValue;
}
_state.F2 = _state.F1;
_state.F1 = val;
@@ -223,9 +231,13 @@ public sealed class Bessel : AbstractBase
{
double val = source[i];
if (double.IsFinite(val))
{
_state.LastValidValue = val;
}
else
{
val = _state.LastValidValue;
}
double filt = Math.FusedMultiplyAdd(_c3, _state.F2,
Math.FusedMultiplyAdd(_c2, _state.F1, _c1 * val));
@@ -236,7 +248,9 @@ public sealed class Bessel : AbstractBase
}
if (_state.Count >= WarmupPeriod)
{
_state.IsHot = true;
}
Last = new TValue(DateTime.MinValue, _state.F1);
@@ -310,7 +324,9 @@ public sealed class Bessel : AbstractBase
}
if (!_state.IsHot && _state.Count >= WarmupPeriod)
{
_state.IsHot = true;
}
Last = new TValue(input.Time, filt);
PubEvent(Last);
@@ -330,7 +346,9 @@ public sealed class Bessel : AbstractBase
public override TSeries Update(TSeries source)
{
if (source.Count == 0)
{
return [];
}
int len = source.Count;
var t = new List<long>(len);
@@ -404,9 +422,13 @@ public sealed class Bessel : AbstractBase
{
double val = source[i];
if (double.IsFinite(val))
{
state.LastValidValue = val;
}
else
{
val = state.LastValidValue;
}
state.F2 = state.F1;
state.F1 = val;
@@ -419,9 +441,13 @@ public sealed class Bessel : AbstractBase
{
double val = source[i];
if (double.IsFinite(val))
{
state.LastValidValue = val;
}
else
{
val = state.LastValidValue;
}
double filt = Math.FusedMultiplyAdd(c3, state.F2,
Math.FusedMultiplyAdd(c2, state.F1, c1 * val));
@@ -433,7 +459,9 @@ public sealed class Bessel : AbstractBase
}
if (!state.IsHot && state.Count >= warmupPeriod)
{
state.IsHot = true;
}
}
/// <summary>
@@ -479,13 +507,19 @@ public sealed class Bessel : AbstractBase
public static void Calculate(ReadOnlySpan<double> source, Span<double> output, int length)
{
if (length < 2)
{
throw new ArgumentException("Length must be at least 2 for 2nd-order Bessel filter", nameof(length));
}
if (source.Length != output.Length)
{
throw new ArgumentException("Source and output must have the same length", nameof(output));
}
if (source.Length == 0)
{
return;
}
double a = Math.Exp(-Math.PI / length);
double b = 2.0 * a * Math.Cos(1.738 * Math.PI / length);