feature_extraction.h File Reference

Header for feature_extraction.c module. More...

#include "arm_math.h"
#include "common_tables.h"
#include "float.h"
#include "dct.h"
#include "mel_filterbank.h"
#include "window.h"

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Data Structures
struct	SpectrogramTypeDef
	Instance structure for the floating-point Spectrogram function. More...
struct	MelSpectrogramTypeDef
	Instance structure for the floating-point MelSpectrogram function. More...
struct	LogMelSpectrogramTypeDef
	Instance structure for the floating-point Log-MelSpectrogram function. More...
struct	MfccTypeDef
	Instance structure for the floating-point Mfcc function. More...

Enumerations
enum	Spectrogram_TypeTypedef { SPECTRUM_TYPE_MAGNITUDE , SPECTRUM_TYPE_POWER }
	Spectrum types. More...
enum	LogMelSpectrogram_ScaleTypedef { LOGMELSPECTROGRAM_SCALE_DB , LOGMELSPECTROGRAM_SCALE_LOG }
	LogMel Spectrum decibel conversion formula. More...

Functions
void	buf_to_float (int16_t *pInSignal, float32_t *pOutSignal, uint32_t len)
	Convert 16-bit PCM into floating point values.
void	buf_to_float_normed (int16_t *pInSignal, float32_t *pOutSignal, uint32_t len)
	Convert 16-bit PCM into normalized floating point values.
void	SpectrogramColumn (SpectrogramTypeDef *S, float32_t *pInSignal, float32_t *pOutCol)
	Power Spectrogram column.
void	MelSpectrogramColumn (MelSpectrogramTypeDef *S, float32_t *pInSignal, float32_t *pOutCol)
	Mel Spectrogram column.
void	LogMelSpectrogramColumn (LogMelSpectrogramTypeDef *S, float32_t *pInSignal, float32_t *pOutCol)
	Log-Mel Spectrogram column.
void	LogMelSpectrogramColumn_q15_Q8 (LogMelSpectrogramTypeDef *S, int16_t *pInSignal, int8_t *pOutCol, int8_t offset, float32_t inv_scale)
void	MfccColumn (MfccTypeDef *S, float32_t *pInSignal, float32_t *pOutCol)
	Mel-Frequency Cepstral Coefficients (MFCCs) column.

Detailed Description

Header for feature_extraction.c module.

Author

MCD Application Team

Attention

Copyright (c) 2023 STMicroelectronics. All rights reserved.

This software is licensed under terms that can be found in the LICENSE file in the root directory of this software component. If no LICENSE file comes with this software, it is provided AS-IS.