mfcc_example.c File Reference

MFCC computation example. More...

#include "feature_extraction.h"

Include dependency graph for mfcc_example.c:

Macros
#define	SAMPLE_RATE   16000U /* Input signal sampling rate */
#define	FFT_LEN   2048U /* Number of FFT points. Must be greater or equal to FRAME_LEN */
#define	FRAME_LEN   FFT_LEN /* Window length and then padded with zeros to match FFT_LEN */
#define	HOP_LEN   512U /* Number of overlapping samples between successive frames */
#define	NUM_MELS   128U /* Number of mel bands */
#define	NUM_MEL_COEFS   2020U /* Number of mel filter weights. Returned by MelFilterbank_Init */
#define	NUM_MFCC   20U /* Number of MFCCs to return */

Functions
void	Preprocessing_Init (void)
void	AudioPreprocessing_Run (int16_t *pInSignal, float32_t *pOutMfcc, uint32_t signal_len)

Variables
arm_rfft_fast_instance_f32	S_Rfft
MelFilterTypeDef	S_MelFilter
DCT_InstanceTypeDef	S_DCT
SpectrogramTypeDef	S_Spectr
MelSpectrogramTypeDef	S_MelSpectr
LogMelSpectrogramTypeDef	S_LogMelSpectr
MfccTypeDef	S_Mfcc
float32_t	pInFrame [FRAME_LEN]
float32_t	pOutColBuffer [NUM_MFCC]
float32_t	pWindowFuncBuffer [FRAME_LEN]
float32_t	pSpectrScratchBuffer [FFT_LEN]
float32_t	pDCTCoefsBuffer [NUM_MELS *NUM_MFCC]
float32_t	pMfccScratchBuffer [NUM_MELS]
float32_t	pMelFilterCoefs [NUM_MEL_COEFS]
uint32_t	pMelFilterStartIndices [NUM_MELS]
uint32_t	pMelFilterStopIndices [NUM_MELS]

Detailed Description

MFCC computation example.

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.