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562dc45ab9
* Moved dllexport from type to methods/staticvar in all Engine runtime code. This improves compile times, memory and performance in dll builds [CL 26082288 by henrik karlsson in 5.3 branch]
50 lines
1.7 KiB
C++
50 lines
1.7 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "DSP/FloatArrayMath.h"
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#include "HAL/Platform.h"
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#include "Templates/UniquePtr.h"
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#if UE_ENABLE_INCLUDE_ORDER_DEPRECATED_IN_5_1
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#include "CoreMinimal.h"
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#endif
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namespace Audio
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{
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/** Convert a mel frequency to a frequency in hz. */
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SIGNALPROCESSING_API float MelToHz(float InMel);
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/** Convert a frequency in hz to a mel frequency. */
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SIGNALPROCESSING_API float HzToMel(float InHz);
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/** Normalization methods for a mel transform. */
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enum class EMelNormalization : uint8
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{
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EqualAmplitude, //< Useful when working on magnitude spectrum
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EqualEuclideanNorm, //< Scale energy by euclidean norm. Good when using magnitude spectrum.
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EqualEnergy //< Useful when working on power spectrum
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};
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/** Settings for a mel kernel which transforms an linearly space spectrum (e.g. FFT Magnitude)
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* to a mel spectrum */
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struct FMelSpectrumKernelSettings
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{
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int32 NumBands; //< Number of bands in Mel spectrum
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float KernelMinCenterFreq; //< Minimum frequency of lowest mel band.
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float KernelMaxCenterFreq; //< Maximum frequency of highest mel band.
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EMelNormalization Normalization; //< Mel band scaling. EqualAmplitude is better for the magnitude spectrum, while EqualEnergy is better for the power spectrum.
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float BandWidthStretch; //< Controls the wideness of each band.
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FMelSpectrumKernelSettings()
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: NumBands(26)
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, KernelMinCenterFreq(100.f)
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, KernelMaxCenterFreq(10000.f)
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, Normalization(EMelNormalization::EqualEnergy)
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, BandWidthStretch(1.f)
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{}
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};
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SIGNALPROCESSING_API TUniquePtr<FContiguousSparse2DKernelTransform> NewMelSpectrumKernelTransform(const FMelSpectrumKernelSettings& InSettings, const int32 InFFTSize, const float InSampleRate);
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}
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