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aubio 0.4.9
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Pitch detection object. More...
Go to the source code of this file.
Typedefs | |
| typedef struct _aubio_pitch_t | aubio_pitch_t |
| pitch detection object More... | |
Functions | |
| void | aubio_pitch_do (aubio_pitch_t *o, const fvec_t *in, fvec_t *out) |
| execute pitch detection on an input signal frame More... | |
| uint_t | aubio_pitch_set_tolerance (aubio_pitch_t *o, smpl_t tol) |
| change yin or yinfft tolerance threshold More... | |
| smpl_t | aubio_pitch_get_tolerance (aubio_pitch_t *o) |
| get yin or yinfft tolerance threshold More... | |
| void | del_aubio_pitch (aubio_pitch_t *o) |
| deletion of the pitch detection object More... | |
| aubio_pitch_t * | new_aubio_pitch (const char_t *method, uint_t buf_size, uint_t hop_size, uint_t samplerate) |
| creation of the pitch detection object More... | |
| uint_t | aubio_pitch_set_unit (aubio_pitch_t *o, const char_t *mode) |
| set the output unit of the pitch detection object More... | |
| uint_t | aubio_pitch_set_silence (aubio_pitch_t *o, smpl_t silence) |
| set the silence threshold of the pitch detection object More... | |
| smpl_t | aubio_pitch_get_silence (aubio_pitch_t *o) |
| set the silence threshold of the pitch detection object More... | |
| smpl_t | aubio_pitch_get_confidence (aubio_pitch_t *o) |
| get the current confidence More... | |
Pitch detection object.
This file creates the objects required for the computation of the selected pitch detection algorithm and output the results, in midi note or Hz.
A list of the pitch detection methods currently available follows.
default : use the default method
Currently, the default method is set to yinfft .
schmitt : Schmitt trigger
This pitch extraction method implements a Schmitt trigger to estimate the period of a signal.
This file was derived from the tuneit project, written by Mario Lang to detect the fundamental frequency of a sound.
See http://delysid.org/tuneit.html
fcomb : a fast harmonic comb filter
This pitch extraction method implements a fast harmonic comb filter to determine the fundamental frequency of a harmonic sound.
This file was derived from the tuneit project, written by Mario Lang to detect the fundamental frequency of a sound.
See http://delysid.org/tuneit.html
mcomb : multiple-comb filter
This fundamental frequency estimation algorithm implements spectral flattening, multi-comb filtering and peak histogramming.
This method was designed by Juan P. Bello and described in:
Juan-Pablo Bello. `‘Towards the Automated Analysis of Simple Polyphonic Music’'. PhD thesis, Centre for Digital Music, Queen Mary University of London, London, UK, 2003.
yin : YIN algorithm
This algorithm was developed by A. de Cheveigne and H. Kawahara and published in:
De Cheveigné, A., Kawahara, H. (2002) "YIN, a fundamental frequency estimator for speech and music", J. Acoust. Soc. Am. 111, 1917-1930.
see http://recherche.ircam.fr/equipes/pcm/pub/people/cheveign.html
yinfast : Yinfast algorithm
This algorithm is equivalent to the YIN algorithm, but computed in the spectral domain for efficiency. See also python/demos/demo_yin_compare.py.
yinfft : Yinfft algorithm
This algorithm was derived from the YIN algorithm. In this implementation, a Fourier transform is used to compute a tapered square difference function, which allows spectral weighting. Because the difference function is tapered, the selection of the period is simplified.
Paul Brossier, Automatic annotation of musical audio for interactive systems, Chapter 3, Pitch Analysis, PhD thesis, Centre for Digital music, Queen Mary University of London, London, UK, 2006.
Definition in file pitch.h.
| typedef struct _aubio_pitch_t aubio_pitch_t |
| void aubio_pitch_do | ( | aubio_pitch_t * | o, |
| const fvec_t * | in, | ||
| fvec_t * | out | ||
| ) |
execute pitch detection on an input signal frame
| o | pitch detection object as returned by new_aubio_pitch() |
| in | input signal of size [hop_size] |
| out | output pitch candidates of size [1] |
| smpl_t aubio_pitch_get_confidence | ( | aubio_pitch_t * | o | ) |
get the current confidence
| o | pitch detection object as returned by new_aubio_pitch() |
| smpl_t aubio_pitch_get_silence | ( | aubio_pitch_t * | o | ) |
set the silence threshold of the pitch detection object
| o | pitch detection object as returned by new_aubio_pitch() |
| smpl_t aubio_pitch_get_tolerance | ( | aubio_pitch_t * | o | ) |
get yin or yinfft tolerance threshold
| o | pitch detection object as returned by new_aubio_pitch() |
| uint_t aubio_pitch_set_silence | ( | aubio_pitch_t * | o, |
| smpl_t | silence | ||
| ) |
set the silence threshold of the pitch detection object
| o | pitch detection object as returned by new_aubio_pitch() |
| silence | level threshold under which pitch should be ignored, in dB |
| uint_t aubio_pitch_set_tolerance | ( | aubio_pitch_t * | o, |
| smpl_t | tol | ||
| ) |
change yin or yinfft tolerance threshold
| o | pitch detection object as returned by new_aubio_pitch() |
| tol | tolerance default is 0.15 for yin and 0.85 for yinfft |
| uint_t aubio_pitch_set_unit | ( | aubio_pitch_t * | o, |
| const char_t * | mode | ||
| ) |
set the output unit of the pitch detection object
| o | pitch detection object as returned by new_aubio_pitch() |
| mode | set pitch units for output |
mode can be one of "Hz", "midi", "cent", or "bin". Defaults to "Hz".
| void del_aubio_pitch | ( | aubio_pitch_t * | o | ) |
deletion of the pitch detection object
| o | pitch detection object as returned by new_aubio_pitch() |
| aubio_pitch_t * new_aubio_pitch | ( | const char_t * | method, |
| uint_t | buf_size, | ||
| uint_t | hop_size, | ||
| uint_t | samplerate | ||
| ) |
creation of the pitch detection object
| method | set pitch detection algorithm |
| buf_size | size of the input buffer to analyse |
| hop_size | step size between two consecutive analysis instant |
| samplerate | sampling rate of the signal |
1.9.4