FLoudnessAnalyzer

[FLoudnessAnalyzer](API\Runtime\SignalProcessing\FLoudnessAnalyzer)

API > API/Runtime > API/Runtime/SignalProcessing

FLoudnessAnalyzer

FLoudnessAnalyzer will calculate perceptual energy or loudness one window at a time. This analyzer only handles mono audio. See FMultichannelLoudnessAnalyzer for multichannel support.

   
Name FLoudnessAnalyzer
Type class
Header File /Engine/Source/Runtime/SignalProcessing/Public/DSP/LoudnessAnalyzer.h
Include Path #include "DSP/LoudnessAnalyzer.h"

Syntax

class FLoudnessAnalyzer

Constructors

Name Remarks Include Path Unreal Specifiers

FLoudnessAnalyzer ( float InSampleRate,
const FLoudnessAnalyzerSettings& InSettings
)

 Construct analyzer DSP/LoudnessAnalyzer.h  

Variables

Protected

Name Type Remarks Include Path Unreal Specifiers
ActualFFTSize int32   DSP/LoudnessAnalyzer.h  
ComplexSpectrum FAlignedFloatBuffer   DSP/LoudnessAnalyzer.h  
CurveWeights FAlignedFloatBuffer   DSP/LoudnessAnalyzer.h  
EnergyScale float Scale factor used to normalize between differing window sizes and fft sizes DSP/LoudnessAnalyzer.h  
FFT TUniquePtr< IFFTAlgorithm >   DSP/LoudnessAnalyzer.h  
FFTFreqSize int32 Number of FFTFrequency bins worth looking at. DSP/LoudnessAnalyzer.h  
MaxFreqIndex int32   DSP/LoudnessAnalyzer.h  
MinFreqIndex int32   DSP/LoudnessAnalyzer.h  
RealSpectrum FAlignedFloatBuffer   DSP/LoudnessAnalyzer.h  
Settings FLoudnessAnalyzerSettings   DSP/LoudnessAnalyzer.h  
Window FAlignedFloatBuffer   DSP/LoudnessAnalyzer.h  
WindowedSamples FAlignedFloatBuffer   DSP/LoudnessAnalyzer.h  

Functions

Public

Name Remarks Include Path Unreal Specifiers

float CalculateLoudness ( TArrayView< const float > InSampleView
)

 Calculate the loudness for the input samples. DSP/LoudnessAnalyzer.h  

float CalculatePerceptualEnergy ( TArrayView< const float > InSampleView
)

 Calculate the perceptual energy for the input samples. DSP/LoudnessAnalyzer.h  

const FLoudnessAnalyzerSettings & GetSettings()

 Return const reference to settings used inside this analyzer. DSP/LoudnessAnalyzer.h  

Static

Name Remarks Include Path Unreal Specifiers

static float ConvertPerceptualEnergyToLKFS ( float InPerceptualEnergy
)

 Convert from perceptual energy to loudness [LKFS = -0.691 + 10 * log_10(Energy)] DSP/LoudnessAnalyzer.h  

static float ConvertPerceptualEnergyToLoudness ( float InPerceptualEnergy
)

 Convert from perceptual energy to loudness [Loudness = 10 * log_10(Energy)] DSP/LoudnessAnalyzer.h  

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