aubio  0.4.1
spectral/filterbank_mel.h
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00001 /*
00002   Copyright (C) 2007-2013 Paul Brossier <piem@aubio.org>
00003                       and Amaury Hazan <ahazan@iua.upf.edu>
00004 
00005   This file is part of aubio.
00006 
00007   aubio is free software: you can redistribute it and/or modify
00008   it under the terms of the GNU General Public License as published by
00009   the Free Software Foundation, either version 3 of the License, or
00010   (at your option) any later version.
00011 
00012   aubio is distributed in the hope that it will be useful,
00013   but WITHOUT ANY WARRANTY; without even the implied warranty of
00014   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015   GNU General Public License for more details.
00016 
00017   You should have received a copy of the GNU General Public License
00018   along with aubio.  If not, see <http://www.gnu.org/licenses/>.
00019 
00020 */
00021 
00022 /** \file
00023 
00024   Filterbank object coefficients initialization
00025 
00026   Functions to create set the ::aubio_filterbank_t coefficients to
00027     - ::aubio_filterbank_set_triangle_bands: overlapping triangular bands,
00028     - ::aubio_filterbank_set_mel_coeffs_slaney: Mel frequency bands.
00029 
00030   \example spectral/test-filterbank_mel.c
00031 
00032 */
00033 
00034 #ifndef _AUBIO_FILTERBANK_MEL_H
00035 #define _AUBIO_FILTERBANK_MEL_H
00036 
00037 #ifdef __cplusplus
00038 extern "C"
00039 {
00040 #endif
00041 
00042 /** filterbank initialization with triangular and overlapping bands
00043 
00044   \param fb filterbank object
00045   \param freqs arbitrary array of boundary frequencies
00046   \param samplerate audio sampling rate
00047 
00048   This function computes the coefficients of the filterbank based on the
00049   boundaries found in freqs, in Hz, and using triangular overlapping bands.
00050 
00051 */
00052 uint_t aubio_filterbank_set_triangle_bands (aubio_filterbank_t * fb,
00053     fvec_t * freqs, smpl_t samplerate);
00054 
00055 /** filterbank initialization for Mel filters using Slaney's coefficients
00056 
00057   \param fb filterbank object
00058   \param samplerate audio sampling rate
00059 
00060   The filter coefficients are built according to Malcolm Slaney's Auditory
00061   Toolbox, available at http://cobweb.ecn.purdue.edu/~malcolm/interval/1998-010/
00062   (see file mfcc.m).
00063 
00064 */
00065 uint_t aubio_filterbank_set_mel_coeffs_slaney (aubio_filterbank_t * fb,
00066     smpl_t samplerate);
00067 
00068 #ifdef __cplusplus
00069 }
00070 #endif
00071 
00072 #endif /* _AUBIO_FILTERBANK_MEL_H */
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