source: src/aubiofilterbank.h @ dcc649c

/*
   Copyright (C) 2007 Amaury Hazan
   Ported to aubio from LibXtract
   http://libxtract.sourceforge.net/
   

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef AUBIOFILTERBANK_H
#include AUBIOFILTERBANK_H

#define NYQUIST 22050.f

// Struct Declaration

/** \brief A structure to store a set of n_filters Mel filters */
typedef struct aubio_mel_filter_ {
    int n_filters;
    float **filters;
} aubio_mel_filter;

// Initialization

/** \brief A function to initialise a mel filter bank 
 * 
 * It is up to the caller to pass in a pointer to memory allocated for freq_bands arrays of length N. This function populates these arrays with magnitude coefficients representing the mel filterbank on a linear scale 
 */
int aubio_mfcc_init(int N, float nyquist, int style, float freq_min, float freq_max, int freq_bands, float **fft_tables);

#endif