Noise Reduction Effect by Paul Licameli.

#ifdef EXPERIMENTAL_NOISE_REDUCTION for now.

src/Experimental.h

@@ -185,5 +185,6 @@
 // Define to make the meters look like a row of LEDs
 //#define EXPERIMENTAL_METER_LED_STYLE
 
-
+// Define for new noise reduction effect from Paul Licameli.
+//#define EXPERIMENTAL_NOISE_REDUCTION
 #endif

src/effects/LoadEffects.cpp

@@ -30,6 +30,9 @@
 #include "Invert.h"
 #include "Leveller.h"
 #include "Noise.h"
+#ifdef EXPERIMENTAL_NOISE_REDUCTION
+#include "NoiseReduction.h"
+#endif
 #include "NoiseRemoval.h"
 #include "Normalize.h"
 #include "Phaser.h"
@@ -192,8 +195,12 @@ void LoadEffects()
 
 #define ATEAM "http://audacityteam.org/namespace#"
 
+#ifdef EXPERIMENTAL_NOISE_REDUCTION
+   CatPtr nrm = em.AddCategory(wxT(ATEAM) wxT("NoiseReduction"),
+      _("Noise Reduction"));
+#endif
    CatPtr nrm = em.AddCategory(wxT(ATEAM) wxT("NoiseRemoval"),
-                               _("Noise Removal"));
+      _("Noise Removal"));
    CatPtr pnt = em.AddCategory(wxT(ATEAM) wxT("PitchAndTempo"),
                                _("Pitch and Tempo"));
    CatPtr tim = em.AddCategory(wxT(ATEAM) wxT("TimelineChanger"),
@@ -249,6 +256,9 @@ void LoadEffects()
    em.RegisterEffect(new EffectFadeOut(), SIMPLE_EFFECT);
    em.RegisterEffect(new EffectInvert());
    em.RegisterEffect(new EffectLeveller(), SIMPLE_EFFECT);
+#ifdef EXPERIMENTAL_NOISE_REDUCTION
+   em.RegisterEffect(new EffectNoiseReduction(), SIMPLE_EFFECT);
+#endif
    em.RegisterEffect(new EffectNoiseRemoval(), SIMPLE_EFFECT);
    em.RegisterEffect(new EffectNormalize(), SIMPLE_EFFECT);
    em.RegisterEffect(new EffectPhaser());

src/effects/NoiseReduction.h

@@ -0,0 +1,52 @@
+/**********************************************************************
+
+  Audacity: A Digital Audio Editor
+
+  NoiseReduction.h
+
+  Dominic Mazzoni
+  Vaughan Johnson (Preview)
+  Paul Licameli
+
+**********************************************************************/
+
+#ifndef __AUDACITY_EFFECT_NOISE_REDUCTION__
+#define __AUDACITY_EFFECT_NOISE_REDUCTION__
+
+#include "Effect.h"
+
+#include <memory>
+
+class EffectNoiseReduction: public Effect {
+public:
+
+   EffectNoiseReduction();
+   virtual ~EffectNoiseReduction();
+
+   using Effect::TrackProgress;
+
+   virtual wxString GetEffectName();
+   virtual std::set<wxString> GetEffectCategories();
+   virtual wxString GetEffectIdentifier();
+   virtual wxString GetEffectAction();
+
+   virtual bool PromptUser();
+   virtual bool TransferParameters( Shuttle & shuttle );
+
+   virtual bool Init();
+   virtual bool CheckWhetherSkipEffect();
+   virtual bool Process();
+
+   class Settings;
+   class Statistics;
+   class Dialog;
+
+private:
+   class Worker;
+   friend Dialog;
+
+   std::auto_ptr<Settings> mSettings;
+   std::auto_ptr<Statistics> mStatistics;
+};
+
+#endif

win/Projects/Audacity/Audacity.vcxproj

@@ -248,6 +248,7 @@
     <ClCompile Include="..\..\..\src\DirManager.cpp" />
     <ClCompile Include="..\..\..\src\Dither.cpp" />
     <ClCompile Include="..\..\..\src\effects\EffectRack.cpp" />
+    <ClCompile Include="..\..\..\src\effects\NoiseReduction.cpp" />
     <ClCompile Include="..\..\..\src\Envelope.cpp" />
     <ClCompile Include="..\..\..\src\FFmpeg.cpp" />
     <ClCompile Include="..\..\..\src\FFT.cpp" />
@@ -517,6 +518,7 @@
     <ClInclude Include="..\..\..\src\CaptureEvents.h" />
     <ClInclude Include="..\..\..\src\commands\OpenSaveCommands.h" />
     <ClInclude Include="..\..\..\src\effects\EffectRack.h" />
+    <ClInclude Include="..\..\..\src\effects\NoiseReduction.h" />
     <ClInclude Include="..\..\..\src\import\FormatClassifier.h" />
     <ClInclude Include="..\..\..\src\import\ImportGStreamer.h" />
     <ClInclude Include="..\..\..\src\import\MultiFormatReader.h" />

win/Projects/Audacity/Audacity.vcxproj.filters

@@ -831,6 +831,9 @@
     <ClCompile Include="..\..\..\src\widgets\NumericTextCtrl.cpp">
       <Filter>src/widgets</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\src\effects\NoiseReduction.cpp">
+      <Filter>src/effects</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\..\src\AboutDialog.h">
@@ -1652,6 +1655,9 @@
     <ClInclude Include="..\..\..\src\widgets\NumericTextCtrl.h">
       <Filter>src/widgets</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\src\effects\NoiseReduction.h">
+      <Filter>src/effects</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Image Include="..\..\audacity.ico">