1 | /* |
---|

2 | Copyright (C) 2007-2009 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 | Mel frequency filter bankd coefficients |
---|

25 | |
---|

26 | Set filter bank coefficients to Mel frequency bands. |
---|

27 | |
---|

28 | The filter coefficients are built according to Malcolm Slaney's Auditory |
---|

29 | Toolbox available at http://cobweb.ecn.purdue.edu/~malcolm/interval/1998-010/ |
---|

30 | (see the file mfcc.m). |
---|

31 | |
---|

32 | */ |
---|

33 | |
---|

34 | #ifndef FILTERBANK_MEL_H |
---|

35 | #define 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 | smpl_t samplerate, fvec_t * freqs); |
---|

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 | This function fills the filterbank coefficients according to Malcolm Slaney. |
---|

61 | |
---|

62 | */ |
---|

63 | uint_t aubio_filterbank_set_mel_coeffs_slaney (aubio_filterbank_t * fb, |
---|

64 | smpl_t samplerate); |
---|

65 | |
---|

66 | #ifdef __cplusplus |
---|

67 | } |
---|

68 | #endif |
---|

69 | |
---|

70 | #endif // FILTERBANK_MEL_H |
---|