A two-pass effect to remove background noise. More...

#include <NoiseRemoval.h>

Inheritance diagram for EffectNoiseRemoval:

Collaboration diagram for EffectNoiseRemoval:

Public Member Functions
	EffectNoiseRemoval ()

virtual	~EffectNoiseRemoval ()

ComponentInterfaceSymbol	GetSymbol () override

TranslatableString	GetDescription () override

EffectType	GetType () const override
	Type determines how it behaves. More...

bool	SupportsAutomation () const override
	Whether the effect has any automatable controls. More...

int	ShowHostInterface (EffectBase &plugin, wxWindow &parent, const EffectDialogFactory &factory, std::shared_ptr< EffectInstance > &pInstance, EffectSettingsAccess &access, bool forceModal=false) override

bool	Init () override

bool	CheckWhetherSkipEffect (const EffectSettings &settings) const override
	After Init(), tell whether Process() should be skipped. More...

bool	Process (EffectInstance &instance, EffectSettings &settings) override

void	End () override

Public Member Functions inherited from StatefulEffect
	~StatefulEffect () override

std::shared_ptr< EffectInstance >	MakeInstance () const override
	Make an object maintaining short-term state of an Effect. More...

Public Member Functions inherited from StatefulEffectBase
virtual bool	Init ()

virtual bool	Process (EffectInstance &instance, EffectSettings &settings)=0

virtual bool	RealtimeInitialize (EffectSettings &settings, double sampleRate)

virtual bool	RealtimeAddProcessor (EffectSettings &settings, EffectOutputs *pOutputs, unsigned numChannels, float sampleRate)

virtual bool	RealtimeSuspend ()

virtual bool	RealtimeResume ()

virtual bool	RealtimeProcessStart (MessagePackage &package)
	settings are possibly changed, since last call, by an asynchronous dialog More...

virtual size_t	RealtimeProcess (size_t group, EffectSettings &settings, const float const inBuf, float const outBuf, size_t numSamples)

virtual bool	RealtimeProcessEnd (EffectSettings &settings) noexcept
	settings can be updated to let a dialog change appearance at idle More...

virtual bool	RealtimeFinalize (EffectSettings &settings) noexcept

virtual size_t	SetBlockSize (size_t maxBlockSize)

virtual size_t	GetBlockSize () const

virtual unsigned	GetAudioInCount () const
	How many input buffers to allocate at once. More...

virtual unsigned	GetAudioOutCount () const
	How many output buffers to allocate at once. More...

virtual sampleCount	GetLatency () const

virtual bool	NeedsDither () const

virtual bool	ProcessInitialize (EffectSettings &settings, double sampleRate, ChannelNames chanMap=nullptr)

virtual bool	ProcessFinalize () noexcept

Public Member Functions inherited from Effect
	Effect ()

virtual	~Effect ()

PluginPath	GetPath () const override

bool	VisitSettings (SettingsVisitor &visitor, EffectSettings &settings) override

bool	VisitSettings (ConstSettingsVisitor &visitor, const EffectSettings &settings) const override

ComponentInterfaceSymbol	GetSymbol () const override

VendorSymbol	GetVendor () const override

wxString	GetVersion () const override

TranslatableString	GetDescription () const override

EffectFamilySymbol	GetFamily () const override
	Report identifier and user-visible name of the effect protocol. More...

bool	IsInteractive () const override
	Whether the effect needs a dialog for entry of settings. More...

bool	IsDefault () const override
	Whether the effect sorts "above the line" in the menus. More...

RealtimeSince	RealtimeSupport () const override
	Since which version of Audacity has the effect supported realtime? More...

bool	SupportsAutomation () const override
	Whether the effect has any automatable controls. More...

bool	SaveSettings (const EffectSettings &settings, CommandParameters &parms) const override
	Store settings as keys and values. More...

bool	LoadSettings (const CommandParameters &parms, EffectSettings &settings) const override
	Restore settings from keys and values. More...

OptionalMessage	LoadUserPreset (const RegistryPath &name, EffectSettings &settings) const override

bool	SaveUserPreset (const RegistryPath &name, const EffectSettings &settings) const override
	Save settings in the configuration file as a user-named preset. More...

RegistryPaths	GetFactoryPresets () const override
	Report names of factory presets. More...

OptionalMessage	LoadFactoryPreset (int id, EffectSettings &settings) const override

OptionalMessage	LoadFactoryDefaults (EffectSettings &settings) const override

virtual const EffectParameterMethods &	Parameters () const

bool	CanExportPresets () const override
	Whether the effect supports export of presets to files, and importing too. More...

bool	HasOptions () const override

const EffectSettingsManager &	GetDefinition () const override

virtual NumericFormatID	GetSelectionFormat ()

bool	SaveSettingsAsString (const EffectSettings &settings, wxString &parms) const override

OptionalMessage	LoadSettingsFromString (const wxString &parms, EffectSettings &settings) const override

bool	IsBatchProcessing () const override

void	SetBatchProcessing () override

void	UnsetBatchProcessing () override

unsigned	TestUIFlags (unsigned mask)

bool	Delegate (Effect &delegate, EffectSettings &settings, InstanceFinder finder={})
	Re-invoke DoEffect on another Effect object that implements the work. More...

Public Member Functions inherited from EffectBase
	EffectBase ()

	~EffectBase () override

bool	IsLinearEffect () const

bool	PreviewsFullSelection () const

void	SetTracks (TrackList *pTracks)

virtual std::any	BeginPreview (const EffectSettings &settings)
	Called when Preview() starts, to allow temporary effect state changes. More...

bool	DoEffect (EffectSettings &settings, const InstanceFinder &finder, double projectRate, TrackList list, WaveTrackFactory factory, NotifyingSelectedRegion &selectedRegion, unsigned flags, const EffectSettingsAccessPtr &pAccess) override

virtual double	CalcPreviewInputLength (const EffectSettings &settings, double previewLength) const =0

void	CountWaveTracks ()

Public Member Functions inherited from EffectPlugin
EffectPlugin &	operator= (EffectPlugin &)=delete

virtual	~EffectPlugin ()

virtual bool	HasOptions () const =0

virtual bool	CanExportPresets () const =0
	Whether the effect supports export of presets to files, and importing too. More...

virtual const EffectSettingsManager &	GetDefinition () const =0

virtual bool	SaveSettingsAsString (const EffectSettings &settings, wxString &parms) const =0

virtual OptionalMessage	LoadSettingsFromString (const wxString &parms, EffectSettings &settings) const =0

virtual bool	IsBatchProcessing () const =0

virtual void	SetBatchProcessing ()=0

virtual void	UnsetBatchProcessing ()=0

virtual bool	DoEffect (EffectSettings &settings, const InstanceFinder &finder, double projectRate, TrackList list, WaveTrackFactory factory, NotifyingSelectedRegion &selectedRegion, unsigned flags, const EffectSettingsAccessPtr &pAccess=nullptr)=0

Public Member Functions inherited from EffectInstanceFactory
virtual	~EffectInstanceFactory ()

virtual std::shared_ptr< EffectInstance >	MakeInstance () const =0
	Make an object maintaining short-term state of an Effect. More...

Public Member Functions inherited from EffectSettingsManager
virtual	~EffectSettingsManager ()

virtual bool	VisitSettings (SettingsVisitor &visitor, EffectSettings &settings)

virtual bool	VisitSettings (ConstSettingsVisitor &visitor, const EffectSettings &settings) const

virtual EffectSettings	MakeSettings () const

virtual bool	CopySettingsContents (const EffectSettings &src, EffectSettings &dst) const
	Update one settings object from another. More...

virtual std::unique_ptr< EffectOutputs >	MakeOutputs () const
	Produce an object to hold values to send to effect output meters. More...

Public Member Functions inherited from EffectDefinitionInterface
virtual	~EffectDefinitionInterface ()

virtual EffectType	GetType () const =0
	Type determines how it behaves. More...

virtual EffectType	GetClassification () const
	Determines which menu it appears in; default same as GetType(). More...

virtual EffectFamilySymbol	GetFamily () const =0
	Report identifier and user-visible name of the effect protocol. More...

virtual bool	IsInteractive () const =0
	Whether the effect needs a dialog for entry of settings. More...

virtual bool	IsDefault () const =0
	Whether the effect sorts "above the line" in the menus. More...

virtual RealtimeSince	RealtimeSupport () const =0
	Since which version of Audacity has the effect supported realtime? More...

bool	SupportsRealtime () const

virtual bool	SupportsAutomation () const =0
	Whether the effect has any automatable controls. More...

virtual bool	EnablesDebug () const
	Whether the effect dialog should have a Debug button; default, always false. More...

virtual ManualPageID	ManualPage () const
	Name of a page in the Audacity alpha manual, default is empty. More...

virtual FilePath	HelpPage () const
	Fully qualified local help file name, default is empty. More...

virtual bool	IsHiddenFromMenus () const
	Default is false. More...

Public Member Functions inherited from ComponentInterface
virtual	~ComponentInterface ()

virtual PluginPath	GetPath () const =0

virtual ComponentInterfaceSymbol	GetSymbol () const =0

virtual VendorSymbol	GetVendor () const =0

virtual wxString	GetVersion () const =0

virtual TranslatableString	GetDescription () const =0

TranslatableString	GetName () const

Public Member Functions inherited from StatefulEffectUIServices
	~StatefulEffectUIServices () override

std::unique_ptr< EffectEditor >	PopulateUI (const EffectPlugin &plugin, ShuttleGui &S, EffectInstance &instance, EffectSettingsAccess &access, const EffectOutputs *pOutputs) const override
	Allows PopulateOrExchange to return null. More...

virtual std::unique_ptr< EffectEditor >	PopulateOrExchange (ShuttleGui &S, EffectInstance &instance, EffectSettingsAccess &access, const EffectOutputs *pOutputs)
	Add controls to effect panel; always succeeds. More...

virtual bool	TransferDataToWindow (const EffectSettings &settings)

virtual bool	TransferDataFromWindow (EffectSettings &settings)

Public Member Functions inherited from BasicEffectUIServices
int	ShowClientInterface (const EffectPlugin &plugin, wxWindow &parent, wxDialog &dialog, EffectEditor *pEditor, bool forceModal) const override

void	ExportPresets (const EffectPlugin &plugin, const EffectSettings &settings) const override

OptionalMessage	ImportPresets (const EffectPlugin &plugin, EffectSettings &settings) const override

void	ShowOptions (const EffectPlugin &plugin) const override

bool	ValidateUI (const EffectPlugin &context, EffectSettings &) const override

bool	CloseUI () const override

Public Member Functions inherited from EffectUIServices
virtual	~EffectUIServices ()

virtual int	ShowHostInterface (EffectBase &plugin, wxWindow &parent, const EffectDialogFactory &factory, std::shared_ptr< EffectInstance > &pInstance, EffectSettingsAccess &access, bool forceModal=false)

virtual int	ShowClientInterface (const EffectPlugin &plugin, wxWindow &parent, wxDialog &dialog, EffectEditor *pEditor, bool forceModal=false) const =0

virtual std::unique_ptr< EffectEditor >	PopulateUI (const EffectPlugin &plugin, ShuttleGui &S, EffectInstance &instance, EffectSettingsAccess &access, const EffectOutputs *pOutputs) const =0
	Adds controls to a panel that is given as the parent window of `S` More...

virtual void	ExportPresets (const EffectPlugin &plugin, const EffectSettings &settings) const =0

virtual OptionalMessage	ImportPresets (const EffectPlugin &plugin, EffectSettings &settings) const =0

virtual void	ShowOptions (const EffectPlugin &plugin) const =0

virtual bool	ValidateUI (const EffectPlugin &context, EffectSettings &settings) const =0

virtual bool	CloseUI () const =0

Static Public Attributes
static const ComponentInterfaceSymbol	Symbol { XO("Noise Removal") }

Static Public Attributes inherited from EffectPlugin
static const wxString	kUserPresetIdent = wxT("User Preset:")

static const wxString	kFactoryPresetIdent = wxT("Factory Preset:")

static const wxString	kCurrentSettingsIdent = wxT("<Current Settings>")

static const wxString	kFactoryDefaultsIdent = wxT("<Factory Defaults>")

Private Member Functions
bool	ProcessOne (int count, WaveTrack *track, sampleCount start, sampleCount len)

void	Initialize ()

void	StartNewTrack ()

void	ProcessSamples (size_t len, float *buffer)

void	FillFirstHistoryWindow ()

void	ApplyFreqSmoothing (float *spec)

void	GetProfile ()

void	RemoveNoise ()

void	RotateHistoryWindows ()

void	FinishTrack ()

Private Attributes
bool	mDoProfile

bool	mHasProfile

int	mLevel

double	mSampleRate

size_t	mWindowSize

size_t	mSpectrumSize

float	mMinSignalTime

Floats	mNoiseThreshold

double	mSensitivity

double	mFreqSmoothingHz

double	mNoiseGain

double	mAttackDecayTime

bool	mbLeaveNoise

std::shared_ptr< WaveTrack >	mOutputTrack

sampleCount	mInSampleCount

sampleCount	mOutSampleCount

int	mInputPos

HFFT	hFFT

Floats	mFFTBuffer

Floats	mWindow

int	mFreqSmoothingBins

int	mAttackDecayBlocks

float	mOneBlockAttackDecay

float	mNoiseAttenFactor

float	mSensitivityFactor

size_t	mMinSignalBlocks

size_t	mHistoryLen

Floats	mInWaveBuffer

Floats	mOutOverlapBuffer

ArraysOf< float >	mSpectrums

ArraysOf< float >	mGains

ArraysOf< float >	mRealFFTs

ArraysOf< float >	mImagFFTs

Friends
class	NoiseRemovalDialog

Additional Inherited Members
Public Types inherited from StatefulEffectBase
using	MessagePackage = EffectInstance::MessagePackage

Public Types inherited from EffectPlugin
using	EffectSettingsAccessPtr = std::shared_ptr< EffectSettingsAccess >

using	InstancePointer = std::shared_ptr< EffectInstanceEx >

using	InstanceFinder = std::function< std::optional< InstancePointer >(EffectSettings &settings) >

Public Types inherited from EffectDefinitionInterface
enum class	RealtimeSince : unsigned { Never , After_3_1 , Always }
	In which versions of Audacity was an effect realtime capable? More...

Public Types inherited from EffectUIServices
enum	: long { DefaultMessageBoxStyle = wxOK \| wxCENTRE }

Static Public Member Functions inherited from Effect
static Effect *	FetchParameters (Effect &e, EffectSettings &)

Static Public Member Functions inherited from EffectBase
static std::optional< InstancePointer >	FindInstance (EffectPlugin &plugin)

static InstanceFinder	DefaultInstanceFinder (EffectPlugin &plugin)

Static Public Member Functions inherited from EffectDefinitionInterface
static Identifier	GetSquashedName (const Identifier &ident)
	A utility that strips spaces and CamelCases a name. More...

Static Public Member Functions inherited from EffectUIServices
static int	DoMessageBox (const EffectPlugin &plugin, const TranslatableString &message, long style=DefaultMessageBoxStyle, const TranslatableString &titleStr={})

Public Attributes inherited from EffectBase
std::shared_ptr< TrackList >	mTracks {}

int	mNumTracks {}

BasicUI::ProgressDialog *	mProgress {}

double	mProjectRate {}

WaveTrackFactory *	mFactory {}

double	mT0 {}

double	mT1 {}

bool	mIsPreview { false }

Protected Member Functions inherited from Effect
bool	CheckWhetherSkipEffect (const EffectSettings &settings) const override
	Default implementation returns false. More...

double	CalcPreviewInputLength (const EffectSettings &settings, double previewLength) const override
	Default implementation returns `previewLength` More...

bool	TotalProgress (double frac, const TranslatableString &={}) const

bool	TrackProgress (int whichTrack, double frac, const TranslatableString &={}) const

bool	TrackGroupProgress (int whichGroup, double frac, const TranslatableString &={}) const

int	GetNumWaveTracks () const

int	GetNumWaveGroups () const

void	GetBounds (const WaveTrack &track, sampleCount start, sampleCount len)

Protected Member Functions inherited from EffectBase
virtual bool	CheckWhetherSkipEffect (const EffectSettings &settings) const =0
	After Init(), tell whether Process() should be skipped. More...

void	SetLinearEffectFlag (bool linearEffectFlag)

void	SetPreviewFullSelectionFlag (bool previewDurationFlag)

bool	IsPreviewing () const

const TrackList *	inputTracks () const

const AudacityProject *	FindProject () const

Protected Attributes inherited from EffectBase
wxArrayString	mPresetNames

unsigned	mUIFlags { 0 }

Detailed Description

A two-pass effect to remove background noise.

The first pass is done over just noise. For each windowed sample of the sound, we take a FFT and then statistics are tabulated for each frequency band - specifically the maximum level achieved by at least (n) sampling windows in a row, for various values of (n).

During the noise removal phase, we start by setting a gain control for each frequency band such that if the sound has exceeded the previously-determined threshold, the gain is set to 0, otherwise the gain is set lower (e.g. -18 dB), to suppress the noise. Then frequency-smoothing is applied so that a single frequency is never suppressed or boosted in isolation, and then time-smoothing is applied so that the gain for each frequency band moves slowly. Lookahead is employed; this effect is not designed for real-time but if it were, there would be a significant delay.

The gain controls are applied to the complex FFT of the signal, and then the inverse FFT is applied, followed by a Hann window; the output signal is then pieced together using overlap/add of half the window size.

Definition at line 36 of file NoiseRemoval.h.

Constructor & Destructor Documentation

◆ EffectNoiseRemoval()

EffectNoiseRemoval::EffectNoiseRemoval ( )

Definition at line 81 of file NoiseRemoval.cpp.

{
   mWindowSize = 2048;
   mSpectrumSize = 1 + mWindowSize / 2;
 
   gPrefs->Read(wxT("/Effects/NoiseRemoval/NoiseSensitivity"),
                &mSensitivity, 0.0);
   gPrefs->Read(wxT("/Effects/NoiseRemoval/NoiseGain"),
                &mNoiseGain, -24.0);
   gPrefs->Read(wxT("/Effects/NoiseRemoval/NoiseFreqSmoothing"),
                &mFreqSmoothingHz, 150.0);
   gPrefs->Read(wxT("/Effects/NoiseRemoval/NoiseAttackDecayTime"),
                &mAttackDecayTime, 0.15);
   gPrefs->Read(wxT("/Effects/NoiseRemoval/NoiseLeaveNoise"),
                &mbLeaveNoise, false);
//   mbLeaveNoise = false;
 
 
   mMinSignalTime = 0.05f;
   mHasProfile = false;
   mDoProfile = true;
 
   mNoiseThreshold.reinit(mSpectrumSize);
 
   Init();
}

References gPrefs, Init(), mAttackDecayTime, mbLeaveNoise, mDoProfile, mFreqSmoothingHz, mHasProfile, mMinSignalTime, mNoiseGain, mNoiseThreshold, mSensitivity, mSpectrumSize, mWindowSize, audacity::BasicSettings::Read(), ArrayOf< X >::reinit(), and wxT().

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◆ ~EffectNoiseRemoval()

EffectNoiseRemoval::~EffectNoiseRemoval ( )

virtual

Definition at line 108 of file NoiseRemoval.cpp.

109{

110}

Member Function Documentation

◆ ApplyFreqSmoothing()

void EffectNoiseRemoval::ApplyFreqSmoothing ( float * spec )

private

Definition at line 259 of file NoiseRemoval.cpp.

{
   Floats tmp{ mSpectrumSize };
   int j, j0, j1;
 
   for(int i = 0; i < mSpectrumSize; i++) {
      j0 = wxMax(0, i - mFreqSmoothingBins);
      j1 = wxMin(mSpectrumSize-1, i + mFreqSmoothingBins);
      tmp[i] = 0.0;
      for(j = j0; j <= j1; j++) {
         tmp[i] += spec[j];
      }
      tmp[i] /= (j1 - j0 + 1);
   }
 
   for(size_t i = 0; i < mSpectrumSize; i++)
      spec[i] = tmp[i];
}

References mFreqSmoothingBins, and mSpectrumSize.

Referenced by End(), and RemoveNoise().

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◆ CheckWhetherSkipEffect()

bool EffectNoiseRemoval::CheckWhetherSkipEffect ( const EffectSettings & settings ) const

overridevirtual

After Init(), tell whether Process() should be skipped.

Implements EffectBase.

Definition at line 149 of file NoiseRemoval.cpp.

{
   return (mLevel == 0);
}

References mLevel.

◆ End()

void EffectNoiseRemoval::End ( )

override

Definition at line 320 of file NoiseRemoval.cpp.

{
   hFFT.reset();
 
   if (mDoProfile) {
      ApplyFreqSmoothing(mNoiseThreshold.get());
   }
 
   mSpectrums.reset();
   mGains.reset();
   mRealFFTs.reset();
   mImagFFTs.reset();
 
   mFFTBuffer.reset();
   mInWaveBuffer.reset();
   mWindow.reset();
   mOutOverlapBuffer.reset();
 
   mOutputTrack.reset();
}

References ApplyFreqSmoothing(), hFFT, mDoProfile, mFFTBuffer, mGains, mImagFFTs, mInWaveBuffer, mNoiseThreshold, mOutOverlapBuffer, mOutputTrack, mRealFFTs, mSpectrums, and mWindow.

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◆ FillFirstHistoryWindow()

void EffectNoiseRemoval::FillFirstHistoryWindow ( )

private

Definition at line 387 of file NoiseRemoval.cpp.

{
   for(size_t i = 0; i < mWindowSize; i++)
      mFFTBuffer[i] = mInWaveBuffer[i];
   RealFFTf(mFFTBuffer.get(), hFFT.get());
   for(size_t i = 1; i + 1 < mSpectrumSize; i++) {
      mRealFFTs[0][i] = mFFTBuffer[hFFT->BitReversed[i]  ];
      mImagFFTs[0][i] = mFFTBuffer[hFFT->BitReversed[i]+1];
      mSpectrums[0][i] = mRealFFTs[0][i]*mRealFFTs[0][i] + mImagFFTs[0][i]*mImagFFTs[0][i];
      mGains[0][i] = mNoiseAttenFactor;
   }
   // DC and Fs/2 bins need to be handled specially
   mSpectrums[0][0] = mFFTBuffer[0]*mFFTBuffer[0];
   mSpectrums[0][mSpectrumSize-1] = mFFTBuffer[1]*mFFTBuffer[1];
   mGains[0][0] = mNoiseAttenFactor;
   mGains[0][mSpectrumSize-1] = mNoiseAttenFactor;
}

References hFFT, mFFTBuffer, mGains, mImagFFTs, mInWaveBuffer, mNoiseAttenFactor, mRealFFTs, mSpectrums, mSpectrumSize, mWindowSize, and RealFFTf().

Referenced by ProcessSamples().

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◆ FinishTrack()

void EffectNoiseRemoval::FinishTrack ( )

private

Definition at line 425 of file NoiseRemoval.cpp.

{
   // Keep flushing empty input buffers through the history
   // windows until we've output exactly as many samples as
   // were input.
   // Well, not exactly, but not more than mWindowSize/2 extra samples at the end.
   // We'll DELETE them later in ProcessOne.
 
   Floats empty{ mWindowSize / 2 };
   for(size_t i = 0; i < mWindowSize / 2; i++)
      empty[i] = 0.0;
 
   while (mOutSampleCount < mInSampleCount) {
      ProcessSamples(mWindowSize / 2, empty.get());
   }
}

References mInSampleCount, mOutSampleCount, mWindowSize, and ProcessSamples().

Referenced by ProcessOne().

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◆ GetDescription()

TranslatableString EffectNoiseRemoval::GetDescription ( )

override

Definition at line 119 of file NoiseRemoval.cpp.

{
   return XO("Removes constant background noise such as fans, tape noise, or hums");
}

References XO().

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◆ GetProfile()

void EffectNoiseRemoval::GetProfile ( )

private

Definition at line 442 of file NoiseRemoval.cpp.

{
   // The noise threshold for each frequency is the maximum
   // level achieved at that frequency for a minimum of
   // mMinSignalBlocks blocks in a row - the max of a min.
 
   int start = mHistoryLen - mMinSignalBlocks;
   int finish = mHistoryLen;
   int i;
 
   for (size_t j = 0; j < mSpectrumSize; j++) {
      float min = mSpectrums[start][j];
      for (i = start+1; i < finish; i++) {
         if (mSpectrums[i][j] < min)
            min = mSpectrums[i][j];
      }
      if (min > mNoiseThreshold[j])
         mNoiseThreshold[j] = min;
   }
 
   mOutSampleCount += mWindowSize / 2; // what is this for?  Not used when we are getting the profile?
}

References mHistoryLen, min(), mMinSignalBlocks, mNoiseThreshold, mOutSampleCount, mSpectrums, mSpectrumSize, and mWindowSize.

Referenced by ProcessSamples().

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◆ GetSymbol()

ComponentInterfaceSymbol EffectNoiseRemoval::GetSymbol ( )

override

Definition at line 114 of file NoiseRemoval.cpp.

{
   return Symbol;
}

References Symbol.

◆ GetType()

EffectType EffectNoiseRemoval::GetType ( ) const

overridevirtual

Type determines how it behaves.

Implements EffectDefinitionInterface.

Definition at line 126 of file NoiseRemoval.cpp.

{
   return EffectTypeProcess;
}

References EffectTypeProcess.

◆ Init()

bool EffectNoiseRemoval::Init ( )

overridevirtual

Default implementation does nothing, returns true

Reimplemented from StatefulEffectBase.

Definition at line 139 of file NoiseRemoval.cpp.

{
   mLevel = gPrefs->Read(wxT("/Effects/NoiseRemoval/Noise_Level"), 3L);
   if ((mLevel < 0) || (mLevel > MAX_NOISE_LEVEL)) {  // corrupted Prefs?
      mLevel = 0;  //Off-skip
      gPrefs->Write(wxT("/Effects/NoiseRemoval/Noise_Level"), mLevel);
   }
   return gPrefs->Flush();
}

References audacity::BasicSettings::Flush(), gPrefs, MAX_NOISE_LEVEL, mLevel, audacity::BasicSettings::Read(), audacity::BasicSettings::Write(), and wxT().

Referenced by EffectNoiseRemoval().

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◆ Initialize()

void EffectNoiseRemoval::Initialize ( )

private

Definition at line 278 of file NoiseRemoval.cpp.

{
   mSampleRate = mProjectRate;
   mFreqSmoothingBins = (int)(mFreqSmoothingHz * mWindowSize / mSampleRate);
   mAttackDecayBlocks = 1 +
      (int)(mAttackDecayTime * mSampleRate / (mWindowSize / 2));
   mNoiseAttenFactor = DB_TO_LINEAR(mNoiseGain);
   mOneBlockAttackDecay = DB_TO_LINEAR(mNoiseGain / mAttackDecayBlocks);
   // Applies to power, divide by 10:
   mSensitivityFactor = pow(10.0, mSensitivity/10.0);
   mMinSignalBlocks =
      (int)(mMinSignalTime * mSampleRate / (mWindowSize / 2));
   if( mMinSignalBlocks < 1 )
      mMinSignalBlocks = 1;
   mHistoryLen = (2 * mAttackDecayBlocks) - 1;
 
   if (mHistoryLen < mMinSignalBlocks)
      mHistoryLen = mMinSignalBlocks;
 
   mSpectrums.reinit(mHistoryLen, mSpectrumSize);
   mGains.reinit(mHistoryLen, mSpectrumSize);
   mRealFFTs.reinit(mHistoryLen, mSpectrumSize);
   mImagFFTs.reinit(mHistoryLen, mSpectrumSize);
 
   // Initialize the FFT
   hFFT = GetFFT(mWindowSize);
 
   mFFTBuffer.reinit(mWindowSize);
   mInWaveBuffer.reinit(mWindowSize);
   mWindow.reinit(mWindowSize);
   mOutOverlapBuffer.reinit(mWindowSize);
 
   // Create a Hann window function
   for(size_t i=0; i<mWindowSize; i++)
      mWindow[i] = 0.5 - 0.5 * cos((2.0*M_PI*i) / mWindowSize);
 
   if (mDoProfile) {
      for (size_t i = 0; i < mSpectrumSize; i++)
         mNoiseThreshold[i] = float(0);
   }
}

References DB_TO_LINEAR, GetFFT(), hFFT, M_PI, mAttackDecayBlocks, mAttackDecayTime, mDoProfile, mFFTBuffer, mFreqSmoothingBins, mFreqSmoothingHz, mGains, mHistoryLen, mImagFFTs, mInWaveBuffer, mMinSignalBlocks, mMinSignalTime, mNoiseAttenFactor, mNoiseGain, mNoiseThreshold, mOneBlockAttackDecay, mOutOverlapBuffer, EffectBase::mProjectRate, mRealFFTs, mSampleRate, mSensitivity, mSensitivityFactor, mSpectrums, mSpectrumSize, mWindow, mWindowSize, ArraysOf< X >::reinit(), and ArrayOf< X >::reinit().

Referenced by Process().

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◆ Process()

bool EffectNoiseRemoval::Process	(	EffectInstance &	instance,
		EffectSettings &	settings
	)

overridevirtual

Implements StatefulEffectBase.

Definition at line 219 of file NoiseRemoval.cpp.

{
   Initialize();
 
   // This same code will both remove noise and profile it,
   // depending on 'mDoProfile'
   EffectOutputTracks outputs { *mTracks, {{ mT0, mT1 }} };
   bool bGoodResult = true;
 
   int count = 0;
   for (auto track : outputs.Get().Selected<WaveTrack>()) {
      double trackStart = track->GetStartTime();
      double trackEnd = track->GetEndTime();
      double t0 = mT0 < trackStart? trackStart: mT0;
      double t1 = mT1 > trackEnd? trackEnd: mT1;
 
      if (t1 > t0) {
         auto start = track->TimeToLongSamples(t0);
         auto end = track->TimeToLongSamples(t1);
         auto len = end - start;
 
         if (!ProcessOne(count, track, start, len)) {
            bGoodResult = false;
            break;
         }
      }
      count++;
   }
 
   if (bGoodResult && mDoProfile) {
      mHasProfile = true;
      mDoProfile = false;
   }
 
   if (bGoodResult)
      outputs.Commit();
 
   return bGoodResult;
}

References details::end(), Initialize(), mDoProfile, mHasProfile, EffectBase::mT0, EffectBase::mT1, EffectBase::mTracks, and ProcessOne().

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◆ ProcessOne()

bool EffectNoiseRemoval::ProcessOne	(	int	count,
		WaveTrack *	track,
		sampleCount	start,
		sampleCount	len
	)

private

Definition at line 540 of file NoiseRemoval.cpp.

{
   if (track == NULL)
      return false;
 
   StartNewTrack();
 
   if (!mDoProfile)
      mOutputTrack = track->EmptyCopy();
 
   auto bufferSize = track->GetMaxBlockSize();
   Floats buffer{ bufferSize };
 
   bool bLoopSuccess = true;
   auto samplePos = start;
   while (samplePos < start + len) {
      //Get a blockSize of samples (smaller than the size of the buffer)
      //Adjust the block size if it is the final block in the track
      const auto blockSize = limitSampleBufferSize(
         track->GetBestBlockSize(samplePos),
         start + len - samplePos
      );
 
      //Get the samples from the track and put them in the buffer
      track->Get((samplePtr)buffer.get(), floatSample, samplePos, blockSize);
 
      mInSampleCount += blockSize;
      ProcessSamples(blockSize, buffer.get());
 
      samplePos += blockSize;
 
      // Update the Progress meter
      if (TrackProgress(count, (samplePos - start).as_double() / len.as_double())) {
         bLoopSuccess = false;
         break;
      }
   }
 
   FinishTrack();
 
   if (!mDoProfile) {
      // Flush the output WaveTrack (since it's buffered)
      mOutputTrack->Flush();
 
      // Take the output track and insert it in place of the original
      // sample data (as operated on -- this may not match mT0/mT1)
      if (bLoopSuccess) {
         double t0 = mOutputTrack->LongSamplesToTime(start);
         double tLen = mOutputTrack->LongSamplesToTime(len);
         // Filtering effects always end up with more data than they started with.  Delete this 'tail'.
         mOutputTrack->HandleClear(tLen, mOutputTrack->GetEndTime(), false, false);
         track->ClearAndPaste(t0, t0 + tLen, mOutputTrack.get(), true, false);
      }
   }
 
   return bLoopSuccess;
}

References sampleCount::as_double(), WaveTrack::ClearAndPaste(), WaveTrack::EmptyCopy(), FinishTrack(), floatSample, ClientData::Site< Host, ClientData, ObjectCopyingPolicy, Pointer, ObjectLockingPolicy, RegistryLockingPolicy >::Get(), WaveTrack::GetBestBlockSize(), WaveTrack::GetMaxBlockSize(), limitSampleBufferSize(), mDoProfile, mInSampleCount, mOutputTrack, ProcessSamples(), StartNewTrack(), and Effect::TrackProgress().

Referenced by Process().

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◆ ProcessSamples()

void EffectNoiseRemoval::ProcessSamples	(	size_t	len,
		float *	buffer
	)

private

Definition at line 360 of file NoiseRemoval.cpp.

{
   while(len && mOutSampleCount < mInSampleCount) {
      size_t avail = wxMin(len, mWindowSize - mInputPos);
      for(size_t i = 0; i < avail; i++)
         mInWaveBuffer[mInputPos + i] = buffer[i];
      buffer += avail;
      len -= avail;
      mInputPos += avail;
 
      if (mInputPos == int(mWindowSize)) {
         FillFirstHistoryWindow();
         if (mDoProfile)
            GetProfile();
         else
            RemoveNoise();
         RotateHistoryWindows();
 
         // Rotate halfway for overlap-add
         for(size_t i = 0; i < mWindowSize / 2; i++) {
            mInWaveBuffer[i] = mInWaveBuffer[i + mWindowSize / 2];
         }
         mInputPos = mWindowSize / 2;
      }
   }
}

References FillFirstHistoryWindow(), GetProfile(), mDoProfile, mInputPos, mInSampleCount, mInWaveBuffer, mOutSampleCount, mWindowSize, RemoveNoise(), and RotateHistoryWindows().

Referenced by FinishTrack(), and ProcessOne().

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◆ RemoveNoise()

void EffectNoiseRemoval::RemoveNoise ( )

private

Definition at line 465 of file NoiseRemoval.cpp.

{
   size_t center = mHistoryLen / 2;
   size_t start = center - mMinSignalBlocks/2;
   size_t finish = start + mMinSignalBlocks;
 
   // Raise the gain for elements in the center of the sliding history
   for (size_t j = 0; j < mSpectrumSize; j++) {
      float min = mSpectrums[start][j];
      for (size_t i = start+1; i < finish; i++) {
         if (mSpectrums[i][j] < min)
            min = mSpectrums[i][j];
      }
      if (min > mSensitivityFactor * mNoiseThreshold[j] && mGains[center][j] < 1.0) {
         if (mbLeaveNoise) mGains[center][j] = 0.0;
         else mGains[center][j] = 1.0;
      } else {
         if (mbLeaveNoise) mGains[center][j] = 1.0;
      }
   }
 
   // Decay the gain in both directions;
   // note that mOneBlockAttackDecay is less than 1.0
   // of linear attenuation per block
   for (size_t j = 0; j < mSpectrumSize; j++) {
      for (size_t i = center + 1; i < mHistoryLen; i++) {
         if (mGains[i][j] < mGains[i - 1][j] * mOneBlockAttackDecay)
            mGains[i][j] = mGains[i - 1][j] * mOneBlockAttackDecay;
         if (mGains[i][j] < mNoiseAttenFactor)
            mGains[i][j] = mNoiseAttenFactor;
      }
      for (size_t i = center; i--;) {
         if (mGains[i][j] < mGains[i + 1][j] * mOneBlockAttackDecay)
            mGains[i][j] = mGains[i + 1][j] * mOneBlockAttackDecay;
         if (mGains[i][j] < mNoiseAttenFactor)
            mGains[i][j] = mNoiseAttenFactor;
      }
   }
 
 
   // Apply frequency smoothing to output gain
   int out = mHistoryLen - 1;  // end of the queue
 
   ApplyFreqSmoothing(mGains[out].get());
 
   // Apply gain to FFT
   for (size_t j = 0; j < (mSpectrumSize-1); j++) {
      mFFTBuffer[j*2  ] = mRealFFTs[out][j] * mGains[out][j];
      mFFTBuffer[j*2+1] = mImagFFTs[out][j] * mGains[out][j];
   }
   // The Fs/2 component is stored as the imaginary part of the DC component
   mFFTBuffer[1] = mRealFFTs[out][mSpectrumSize-1] * mGains[out][mSpectrumSize-1];
 
   // Invert the FFT into the output buffer
   InverseRealFFTf(mFFTBuffer.get(), hFFT.get());
 
   // Overlap-add
   for(size_t j = 0; j < (mSpectrumSize-1); j++) {
      mOutOverlapBuffer[j*2  ] += mFFTBuffer[hFFT->BitReversed[j]  ] * mWindow[j*2  ];
      mOutOverlapBuffer[j*2+1] += mFFTBuffer[hFFT->BitReversed[j]+1] * mWindow[j*2+1];
   }
 
   // Output the first half of the overlap buffer, they're done -
   // and then shift the next half over.
   if (mOutSampleCount >= 0) {   // ...but not if it's the first half-window
      mOutputTrack->Append((samplePtr)mOutOverlapBuffer.get(), floatSample,
                           mWindowSize / 2);
   }
   mOutSampleCount += mWindowSize / 2;
   for(size_t j = 0; j < mWindowSize / 2; j++) {
      mOutOverlapBuffer[j] = mOutOverlapBuffer[j + (mWindowSize / 2)];
      mOutOverlapBuffer[j + (mWindowSize / 2)] = 0.0;
   }
}

References ApplyFreqSmoothing(), floatSample, hFFT, InverseRealFFTf(), mbLeaveNoise, mFFTBuffer, mGains, mHistoryLen, mImagFFTs, min(), mMinSignalBlocks, mNoiseAttenFactor, mNoiseThreshold, mOneBlockAttackDecay, mOutOverlapBuffer, mOutputTrack, mOutSampleCount, mRealFFTs, mSensitivityFactor, mSpectrums, mSpectrumSize, mWindow, and mWindowSize.

Referenced by ProcessSamples().

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◆ RotateHistoryWindows()

void EffectNoiseRemoval::RotateHistoryWindows ( )

private

Definition at line 416 of file NoiseRemoval.cpp.

{
   // Remember the last window so we can reuse it
   Rotate(mSpectrums, mHistoryLen);
   Rotate(mGains, mHistoryLen);
   Rotate(mRealFFTs, mHistoryLen);
   Rotate(mImagFFTs, mHistoryLen);
}

References mGains, mHistoryLen, mImagFFTs, mRealFFTs, mSpectrums, and anonymous_namespace{NoiseRemoval.cpp}::Rotate().

Referenced by ProcessSamples().

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◆ ShowHostInterface()

int EffectNoiseRemoval::ShowHostInterface	(	EffectBase &	plugin,
		wxWindow &	parent,
		const EffectDialogFactory &	factory,
		std::shared_ptr< EffectInstance > &	pInstance,
		EffectSettingsAccess &	access,
		bool	forceModal = `false`
	)

overridevirtual

An override still here for historical reasons, ignoring the factory and the access

We would like to make this effect behave more like others, but it does have its unusual two-pass nature. First choose and analyze an example of noise, then apply noise reduction to another selection. That is difficult to fit into the framework for managing settings of other effects.

Reimplemented from EffectUIServices.

Definition at line 160 of file NoiseRemoval.cpp.

{
   // Assign the out parameter
   pInstance = MakeInstance();
   if (pInstance && !pInstance->Init())
      pInstance.reset();
 
   // to do: use forceModal correctly
   NoiseRemovalDialog dlog(this, access, &parent);
   dlog.mSensitivity = mSensitivity;
   dlog.mGain = -mNoiseGain;
   dlog.mFreq = mFreqSmoothingHz;
   dlog.mTime = mAttackDecayTime;
   dlog.mbLeaveNoise = mbLeaveNoise;
   dlog.mKeepSignal->SetValue(!mbLeaveNoise);
   dlog.mKeepNoise->SetValue(mbLeaveNoise);
 
   // We may want to twiddle the levels if we are setting
   // from a macro editing dialog
   bool bAllowTwiddleSettings = forceModal;
 
   if (mHasProfile || bAllowTwiddleSettings) {
      dlog.m_pButton_Preview->Enable(GetNumWaveTracks() != 0);
      dlog.m_pButton_RemoveNoise->SetDefault();
   } else {
      dlog.m_pButton_Preview->Enable(false);
      dlog.m_pButton_RemoveNoise->Enable(false);
   }
 
   dlog.TransferDataToWindow();
   dlog.mKeepNoise->SetValue(dlog.mbLeaveNoise);
   dlog.CentreOnParent();
   dlog.ShowModal();
 
   const auto returnCode = dlog.GetReturnCode();
   if (!returnCode)
      return 0;
 
   mSensitivity = dlog.mSensitivity;
   mNoiseGain = -dlog.mGain;
   mFreqSmoothingHz = dlog.mFreq;
   mAttackDecayTime = dlog.mTime;
   mbLeaveNoise = dlog.mbLeaveNoise;
 
   gPrefs->Write(wxT("/Effects/NoiseRemoval/NoiseSensitivity"), mSensitivity);
   gPrefs->Write(wxT("/Effects/NoiseRemoval/NoiseGain"), mNoiseGain);
   gPrefs->Write(wxT("/Effects/NoiseRemoval/NoiseFreqSmoothing"), mFreqSmoothingHz);
   gPrefs->Write(wxT("/Effects/NoiseRemoval/NoiseAttackDecayTime"), mAttackDecayTime);
   gPrefs->Write(wxT("/Effects/NoiseRemoval/NoiseLeaveNoise"), mbLeaveNoise);
 
   mDoProfile = (dlog.GetReturnCode() == 1);
   if (!gPrefs->Flush())
      return 0;
   return returnCode;
}

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◆ StartNewTrack()

void EffectNoiseRemoval::StartNewTrack ( )

private

Definition at line 341 of file NoiseRemoval.cpp.

{
   for(size_t i = 0; i < mHistoryLen; i++) {
      for(size_t j = 0; j < mSpectrumSize; j++) {
         mSpectrums[i][j] = 0;
         mGains[i][j] = mNoiseAttenFactor;
         mRealFFTs[i][j] = 0.0;
         mImagFFTs[i][j] = 0.0;
      }
   }
 
   for(size_t j = 0; j < mWindowSize; j++)
      mOutOverlapBuffer[j] = 0.0;
 
   mInputPos = 0;
   mInSampleCount = 0;
   mOutSampleCount = -(int)((mWindowSize / 2) * (mHistoryLen - 1));
}

References mGains, mHistoryLen, mImagFFTs, mInputPos, mInSampleCount, mNoiseAttenFactor, mOutOverlapBuffer, mOutSampleCount, mRealFFTs, mSpectrums, mSpectrumSize, and mWindowSize.

Referenced by ProcessOne().

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◆ SupportsAutomation()

bool EffectNoiseRemoval::SupportsAutomation ( ) const

overridevirtual

Whether the effect has any automatable controls.

Implements EffectDefinitionInterface.

Definition at line 131 of file NoiseRemoval.cpp.

{
   return false;
}

Friends And Related Function Documentation

◆ NoiseRemovalDialog

friend class NoiseRemovalDialog

friend

Definition at line 126 of file NoiseRemoval.h.

Member Data Documentation

◆ hFFT

HFFT EffectNoiseRemoval::hFFT

private

Definition at line 108 of file NoiseRemoval.h.

Referenced by End(), FillFirstHistoryWindow(), Initialize(), and RemoveNoise().

◆ mAttackDecayBlocks

int EffectNoiseRemoval::mAttackDecayBlocks

private

Definition at line 113 of file NoiseRemoval.h.

Referenced by Initialize().

◆ mAttackDecayTime

double EffectNoiseRemoval::mAttackDecayTime

private

Definition at line 86 of file NoiseRemoval.h.

Referenced by EffectNoiseRemoval(), Initialize(), NoiseRemovalDialog::OnPreview(), and ShowHostInterface().

◆ mbLeaveNoise

bool EffectNoiseRemoval::mbLeaveNoise

private

Definition at line 87 of file NoiseRemoval.h.

Referenced by EffectNoiseRemoval(), NoiseRemovalDialog::OnPreview(), RemoveNoise(), and ShowHostInterface().

◆ mDoProfile

bool EffectNoiseRemoval::mDoProfile

private

Definition at line 67 of file NoiseRemoval.h.

Referenced by EffectNoiseRemoval(), End(), Initialize(), NoiseRemovalDialog::OnPreview(), Process(), ProcessOne(), ProcessSamples(), and ShowHostInterface().

◆ mFFTBuffer

Floats EffectNoiseRemoval::mFFTBuffer

private

Definition at line 109 of file NoiseRemoval.h.

Referenced by End(), FillFirstHistoryWindow(), Initialize(), and RemoveNoise().

◆ mFreqSmoothingBins

int EffectNoiseRemoval::mFreqSmoothingBins

private

Definition at line 112 of file NoiseRemoval.h.

Referenced by ApplyFreqSmoothing(), and Initialize().

◆ mFreqSmoothingHz

double EffectNoiseRemoval::mFreqSmoothingHz

private

Definition at line 84 of file NoiseRemoval.h.

Referenced by EffectNoiseRemoval(), Initialize(), NoiseRemovalDialog::OnPreview(), and ShowHostInterface().

◆ mGains

ArraysOf<float> EffectNoiseRemoval::mGains

private

Definition at line 122 of file NoiseRemoval.h.

Referenced by End(), FillFirstHistoryWindow(), Initialize(), RemoveNoise(), RotateHistoryWindows(), and StartNewTrack().

◆ mHasProfile

bool EffectNoiseRemoval::mHasProfile

private

Definition at line 68 of file NoiseRemoval.h.

Referenced by EffectNoiseRemoval(), Process(), and ShowHostInterface().

◆ mHistoryLen

size_t EffectNoiseRemoval::mHistoryLen

private

Definition at line 118 of file NoiseRemoval.h.

Referenced by GetProfile(), Initialize(), RemoveNoise(), RotateHistoryWindows(), and StartNewTrack().

◆ mImagFFTs

ArraysOf<float> EffectNoiseRemoval::mImagFFTs

private

Definition at line 124 of file NoiseRemoval.h.

Referenced by End(), FillFirstHistoryWindow(), Initialize(), RemoveNoise(), RotateHistoryWindows(), and StartNewTrack().

◆ mInputPos

int EffectNoiseRemoval::mInputPos

private

Definition at line 106 of file NoiseRemoval.h.

Referenced by ProcessSamples(), and StartNewTrack().

◆ mInSampleCount

sampleCount EffectNoiseRemoval::mInSampleCount

private

Definition at line 104 of file NoiseRemoval.h.

Referenced by FinishTrack(), ProcessOne(), ProcessSamples(), and StartNewTrack().

◆ mInWaveBuffer

Floats EffectNoiseRemoval::mInWaveBuffer

private

Definition at line 119 of file NoiseRemoval.h.

Referenced by End(), FillFirstHistoryWindow(), Initialize(), and ProcessSamples().

◆ mLevel

int EffectNoiseRemoval::mLevel

private

Definition at line 69 of file NoiseRemoval.h.

Referenced by CheckWhetherSkipEffect(), and Init().

◆ mMinSignalBlocks

size_t EffectNoiseRemoval::mMinSignalBlocks

private

Definition at line 117 of file NoiseRemoval.h.

Referenced by GetProfile(), Initialize(), and RemoveNoise().

◆ mMinSignalTime

float EffectNoiseRemoval::mMinSignalTime

private

Definition at line 75 of file NoiseRemoval.h.

Referenced by EffectNoiseRemoval(), and Initialize().

◆ mNoiseAttenFactor

float EffectNoiseRemoval::mNoiseAttenFactor

private

Definition at line 115 of file NoiseRemoval.h.

Referenced by FillFirstHistoryWindow(), Initialize(), RemoveNoise(), and StartNewTrack().

◆ mNoiseGain

double EffectNoiseRemoval::mNoiseGain

private

Definition at line 85 of file NoiseRemoval.h.

Referenced by EffectNoiseRemoval(), Initialize(), NoiseRemovalDialog::OnPreview(), and ShowHostInterface().

◆ mNoiseThreshold

Floats EffectNoiseRemoval::mNoiseThreshold

private

Definition at line 79 of file NoiseRemoval.h.

Referenced by EffectNoiseRemoval(), End(), GetProfile(), Initialize(), and RemoveNoise().

◆ mOneBlockAttackDecay

float EffectNoiseRemoval::mOneBlockAttackDecay

private

Definition at line 114 of file NoiseRemoval.h.

Referenced by Initialize(), and RemoveNoise().

◆ mOutOverlapBuffer

Floats EffectNoiseRemoval::mOutOverlapBuffer

private

Definition at line 120 of file NoiseRemoval.h.

Referenced by End(), Initialize(), RemoveNoise(), and StartNewTrack().

◆ mOutputTrack

std::shared_ptr<WaveTrack> EffectNoiseRemoval::mOutputTrack

private

Definition at line 103 of file NoiseRemoval.h.

Referenced by End(), ProcessOne(), and RemoveNoise().

◆ mOutSampleCount

sampleCount EffectNoiseRemoval::mOutSampleCount

private

Definition at line 105 of file NoiseRemoval.h.

Referenced by FinishTrack(), GetProfile(), ProcessSamples(), RemoveNoise(), and StartNewTrack().

◆ mRealFFTs

ArraysOf<float> EffectNoiseRemoval::mRealFFTs

private

Definition at line 123 of file NoiseRemoval.h.

Referenced by End(), FillFirstHistoryWindow(), Initialize(), RemoveNoise(), RotateHistoryWindows(), and StartNewTrack().

◆ mSampleRate

double EffectNoiseRemoval::mSampleRate

private

Definition at line 72 of file NoiseRemoval.h.

Referenced by Initialize().

◆ mSensitivity

double EffectNoiseRemoval::mSensitivity

private

Definition at line 83 of file NoiseRemoval.h.

Referenced by EffectNoiseRemoval(), Initialize(), NoiseRemovalDialog::OnPreview(), and ShowHostInterface().

◆ mSensitivityFactor

float EffectNoiseRemoval::mSensitivityFactor

private

Definition at line 116 of file NoiseRemoval.h.

Referenced by Initialize(), and RemoveNoise().

◆ mSpectrums

ArraysOf<float> EffectNoiseRemoval::mSpectrums

private

Definition at line 121 of file NoiseRemoval.h.

Referenced by End(), FillFirstHistoryWindow(), GetProfile(), Initialize(), RemoveNoise(), RotateHistoryWindows(), and StartNewTrack().

◆ mSpectrumSize

size_t EffectNoiseRemoval::mSpectrumSize

private

Definition at line 74 of file NoiseRemoval.h.

Referenced by ApplyFreqSmoothing(), EffectNoiseRemoval(), FillFirstHistoryWindow(), GetProfile(), Initialize(), RemoveNoise(), and StartNewTrack().

◆ mWindow

Floats EffectNoiseRemoval::mWindow

private

Definition at line 110 of file NoiseRemoval.h.

Referenced by End(), Initialize(), and RemoveNoise().

◆ mWindowSize

size_t EffectNoiseRemoval::mWindowSize

private

Definition at line 73 of file NoiseRemoval.h.

Referenced by EffectNoiseRemoval(), FillFirstHistoryWindow(), FinishTrack(), GetProfile(), Initialize(), ProcessSamples(), RemoveNoise(), and StartNewTrack().

◆ Symbol

const ComponentInterfaceSymbol EffectNoiseRemoval::Symbol { XO("Noise Removal") }

static

Definition at line 39 of file NoiseRemoval.h.

Referenced by GetSymbol().

The documentation for this class was generated from the following files:

Public Member Functions

Static Public Attributes

Private Member Functions

Private Attributes

Friends

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ EffectNoiseRemoval()

◆ ~EffectNoiseRemoval()

Member Function Documentation

◆ ApplyFreqSmoothing()

◆ CheckWhetherSkipEffect()

◆ End()

◆ FillFirstHistoryWindow()

◆ FinishTrack()

◆ GetDescription()

◆ GetProfile()

◆ GetSymbol()

◆ GetType()

◆ Init()

◆ Initialize()

◆ Process()

◆ ProcessOne()

◆ ProcessSamples()

◆ RemoveNoise()

◆ RotateHistoryWindows()

◆ ShowHostInterface()

◆ StartNewTrack()

◆ SupportsAutomation()

Friends And Related Function Documentation

◆ NoiseRemovalDialog

Member Data Documentation

◆ hFFT

◆ mAttackDecayBlocks

◆ mAttackDecayTime

◆ mbLeaveNoise

◆ mDoProfile

◆ mFFTBuffer

◆ mFreqSmoothingBins

◆ mFreqSmoothingHz

◆ mGains

◆ mHasProfile

◆ mHistoryLen

◆ mImagFFTs

◆ mInputPos

◆ mInSampleCount

◆ mInWaveBuffer

◆ mLevel

◆ mMinSignalBlocks

◆ mMinSignalTime

◆ mNoiseAttenFactor

◆ mNoiseGain

◆ mNoiseThreshold

◆ mOneBlockAttackDecay

◆ mOutOverlapBuffer

◆ mOutputTrack

◆ mOutSampleCount

◆ mRealFFTs

◆ mSampleRate

◆ mSensitivity

◆ mSensitivityFactor

◆ mSpectrums

◆ mSpectrumSize

◆ mWindow

◆ mWindowSize

◆ Symbol