FConstantQAnalyzer | Unreal Engine 5.7 Documentation

API > API/Plugins > API/Plugins/AudioSynesthesiaCore

The Constant Q Analyzer computs a pseudo constant q transform of the input audio. ConstantQ transforms produce frequency strength at logarithmically spaced frequency intervals (as opposed to the linearly spaced intervals of the FFT). Logarithmically spaced frequency intervals map nicely to musical scales.


Name	FConstantQAnalyzer
Type	class
Header File	/Engine/Plugins/Runtime/AudioSynesthesia/Source/AudioSynesthesiaCore/Public/ConstantQAnalyzer.h
Include Path	#include "ConstantQAnalyzer.h"

Syntax

class FConstantQAnalyzer

Constructors

Name	Remarks	Include Path	Unreal Specifiers
FConstantQAnalyzer ( const FConstantQAnalyzerSettings& InSettings, const float InSampleRate )	Construct a FConstantQAnalyzer	ConstantQAnalyzer.h

Variables

Protected

Name	Type	Remarks	Include Path
ActualFFTSize	int32		ConstantQAnalyzer.h
ComplexSpectrum	FAlignedFloatBuffer		ConstantQAnalyzer.h
CQTTransform	TUniquePtr< FContiguousSparse2DKernelTransform >		ConstantQAnalyzer.h
FFT	TUniquePtr< IFFTAlgorithm >		ConstantQAnalyzer.h
NumUsefulFFTBins	int32	Only the first (FFTSize / 2) + 1 FFT bins are used since FFT of real values is conjugate symmetric.	ConstantQAnalyzer.h
RealSpectrum	FAlignedFloatBuffer		ConstantQAnalyzer.h
SampleRate	const float		ConstantQAnalyzer.h
Settings	const FConstantQAnalyzerSettings		ConstantQAnalyzer.h
Window	FWindow	Scale factor to normalize between different FFT Sizes	ConstantQAnalyzer.h
WindowedSamples	FAlignedFloatBuffer		ConstantQAnalyzer.h

Functions

Public

Name	Remarks	Include Path	Unreal Specifiers
void CalculateCQT ( const float* InSamples, TArray< float >& OutCQT )	Calcualte Constant Q Transform of input audio.	ConstantQAnalyzer.h
const FConstantQAnalyzerSettings & GetSettings()	Returns a reference to the settings used in this analyzer	ConstantQAnalyzer.h