SphinxBase
5prealpha
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Implementation of pitch estimation. More...
Go to the source code of this file.
Typedefs | |
typedef struct yin_s | yin_t |
Frame-based moving-window pitch estimator. | |
Functions | |
SPHINXBASE_EXPORT yin_t * | yin_init (int frame_size, float search_threshold, float search_range, int smooth_window) |
Initialize moving-window pitch estimation. | |
SPHINXBASE_EXPORT void | yin_free (yin_t *pe) |
Free a moving-window pitch estimator. | |
SPHINXBASE_EXPORT void | yin_start (yin_t *pe) |
Start processing an utterance. | |
SPHINXBASE_EXPORT void | yin_end (yin_t *pe) |
Mark the end of an utterance. | |
SPHINXBASE_EXPORT void | yin_write (yin_t *pe, int16 const *frame) |
Feed a frame of data to the pitch estimator. More... | |
SPHINXBASE_EXPORT int | yin_read (yin_t *pe, uint16 *out_period, uint16 *out_bestdiff) |
Read a raw estimated pitch value from the pitch estimator. More... | |
Implementation of pitch estimation.
This implements part of the YIN algorithm:
"YIN, a fundamental frequency estimator for speech and music". Alain de Cheveigné and Hideki Kawahara. Journal of the Acoustical Society of America, 111 (4), April 2002.
Definition in file yin.h.
SPHINXBASE_EXPORT int yin_read | ( | yin_t * | pe, |
uint16 * | out_period, | ||
uint16 * | out_bestdiff | ||
) |
Read a raw estimated pitch value from the pitch estimator.
pe | Pitch estimator. |
out_period | Output: an estimate of the period (not the pitch) of the signal in samples. |
out_bestdiff | Output: the minimum normalized difference value associated with *out_pitch , in Q15 format (i.e. scaled by 32768). This can be interpreted as one minus the probability of voicing. |
Definition at line 222 of file yin.c.
References yin_s::diff_window, yin_s::endut, yin_s::nfr, yin_s::period_window, yin_s::search_range, yin_s::wcur, yin_s::wsize, and yin_s::wstart.
SPHINXBASE_EXPORT void yin_write | ( | yin_t * | pe, |
int16 const * | frame | ||
) |
Feed a frame of data to the pitch estimator.
pe | Pitch estimator. |
frame | Frame of frame_size (see yin_init()) samples of audio data. |
Definition at line 195 of file yin.c.
References yin_s::wsize, and yin_s::wstart.