prevent NAN clipping in Filter. fixes #27

vvvv · Nov 24, 2023 · 404683b · 404683b
1 parent 136f022
commit 404683b
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Showing 2 changed files with 11 additions and 5 deletions.
diff --git a/deployment/VL.Audio.nuspec b/deployment/VL.Audio.nuspec
@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2011/10/nuspec.xsd">
   <metadata>
     <id>VL.Audio</id>
-    <version>1.3.2-preview</version>
+    <version>1.3.3-preview</version>
     <title>VL.Audio</title>
     <authors>NAudio, vvvv</authors>
     <owners>vvvv</owners>

diff --git a/src/Signals/Filters/AnalogModelingFilterSignal.cs b/src/Signals/Filters/AnalogModelingFilterSignal.cs
@@ -257,11 +257,19 @@ void MoogLadder(float[] buffer, int offset, int count)
                 y4 = y3 * p + oldy3 * p - k * y4;
                 //Clipper band limited sigmoid
                 y4 -= (y4 * y4 * y4) / 6.0f;
+
+                //prevent NAN clipping when input signal is too loud
+                x = !float.IsNaN(x) ? x : 0;
+                y1 = !float.IsNaN(y1) ? y1 : 0;
+                y2 = !float.IsNaN(y2) ? y2 : 0;
+                y3 = !float.IsNaN(y3) ? y3 : 0;
+                y4 = !float.IsNaN(y4) ? y4 : 0;
+
                 oldx = x;
                 oldy1 = y1;
                 oldy2 = y2;
                 oldy3 = y3;
-                
+
                 switch (FilterType.Value) 
                 {
                     case AnalogModelingFilterType.LowPass:
@@ -279,6 +287,4 @@ void MoogLadder(float[] buffer, int offset, int count)
         }
 
     }
-}
-
-
+}