| 1 | /* |
|---|
| 2 | Copyright (C) 2007-2013 Paul Brossier <piem@aubio.org> |
|---|
| 3 | and Amaury Hazan <ahazan@iua.upf.edu> |
|---|
| 4 | |
|---|
| 5 | This file is part of aubio. |
|---|
| 6 | |
|---|
| 7 | aubio is free software: you can redistribute it and/or modify |
|---|
| 8 | it under the terms of the GNU General Public License as published by |
|---|
| 9 | the Free Software Foundation, either version 3 of the License, or |
|---|
| 10 | (at your option) any later version. |
|---|
| 11 | |
|---|
| 12 | aubio is distributed in the hope that it will be useful, |
|---|
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
|---|
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
|---|
| 15 | GNU General Public License for more details. |
|---|
| 16 | |
|---|
| 17 | You should have received a copy of the GNU General Public License |
|---|
| 18 | along with aubio. If not, see <http://www.gnu.org/licenses/>. |
|---|
| 19 | |
|---|
| 20 | */ |
|---|
| 21 | |
|---|
| 22 | /** \file |
|---|
| 23 | |
|---|
| 24 | Filterbank object coefficients initialization |
|---|
| 25 | |
|---|
| 26 | Functions to create set the ::aubio_filterbank_t coefficients to |
|---|
| 27 | - ::aubio_filterbank_set_triangle_bands: overlapping triangular bands, |
|---|
| 28 | - ::aubio_filterbank_set_mel_coeffs_slaney: Mel frequency bands. |
|---|
| 29 | |
|---|
| 30 | \example spectral/test-filterbank_mel.c |
|---|
| 31 | |
|---|
| 32 | */ |
|---|
| 33 | |
|---|
| 34 | #ifndef AUBIO_FILTERBANK_MEL_H |
|---|
| 35 | #define AUBIO_FILTERBANK_MEL_H |
|---|
| 36 | |
|---|
| 37 | #ifdef __cplusplus |
|---|
| 38 | extern "C" |
|---|
| 39 | { |
|---|
| 40 | #endif |
|---|
| 41 | |
|---|
| 42 | /** filterbank initialization with triangular and overlapping bands |
|---|
| 43 | |
|---|
| 44 | \param fb filterbank object |
|---|
| 45 | \param freqs arbitrary array of boundary frequencies |
|---|
| 46 | \param samplerate audio sampling rate |
|---|
| 47 | |
|---|
| 48 | This function computes the coefficients of the filterbank based on the |
|---|
| 49 | boundaries found in freqs, in Hz, and using triangular overlapping bands. |
|---|
| 50 | |
|---|
| 51 | */ |
|---|
| 52 | uint_t aubio_filterbank_set_triangle_bands (aubio_filterbank_t * fb, |
|---|
| 53 | const fvec_t * freqs, smpl_t samplerate); |
|---|
| 54 | |
|---|
| 55 | /** filterbank initialization for Mel filters using Slaney's coefficients |
|---|
| 56 | |
|---|
| 57 | \param fb filterbank object |
|---|
| 58 | \param samplerate audio sampling rate |
|---|
| 59 | |
|---|
| 60 | The filter coefficients are built according to Malcolm Slaney's Auditory |
|---|
| 61 | Toolbox, available online at the following address (see file mfcc.m): |
|---|
| 62 | |
|---|
| 63 | https://engineering.purdue.edu/~malcolm/interval/1998-010/ |
|---|
| 64 | |
|---|
| 65 | */ |
|---|
| 66 | uint_t aubio_filterbank_set_mel_coeffs_slaney (aubio_filterbank_t * fb, |
|---|
| 67 | smpl_t samplerate); |
|---|
| 68 | |
|---|
| 69 | #ifdef __cplusplus |
|---|
| 70 | } |
|---|
| 71 | #endif |
|---|
| 72 | |
|---|
| 73 | #endif /* AUBIO_FILTERBANK_MEL_H */ |
|---|
