include/yin.h File Reference

Implementation of pitch estimation. More...

#include <prim_type.h>

Go to the source code of this file.

Typedefs

typedef struct yin_s yin_t
 Frame-based moving-window pitch estimator.

Functions

yin_tyin_init (int frame_size, float search_threshold, float search_range, int smooth_window)
 Initialize moving-window pitch estimation.
void yin_free (yin_t *pe)
 Free a moving-window pitch estimator.
void yin_start (yin_t *pe)
 Start processing an utterance.
void yin_end (yin_t *pe)
 Mark the end of an utterance.
void yin_write (yin_t *pe, int16 const *frame)
 Feed a frame of data to the pitch estimator.
int yin_read (yin_t *pe, uint16 *out_period, uint16 *out_bestdiff)
 Read a raw estimated pitch value from the pitch estimator.


Detailed Description

Implementation of pitch estimation.

Author:
David Huggins-Daines <dhuggins@cs.cmu.edu>
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.


Function Documentation

int yin_read ( yin_t pe,
uint16 *  out_period,
uint16 *  out_bestdiff 
)

Read a raw estimated pitch value from the pitch estimator.

Parameters:
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.
Returns:
Non-zero if enough data was avaliable to return a pitch estimate, zero otherwise.

Definition at line 220 of file yin.c.

void yin_write ( yin_t pe,
int16 const *  frame 
)

Feed a frame of data to the pitch estimator.

Parameters:
pe Pitch estimator.
frame Frame of frame_size (see yin_init()) samples of audio data.

Definition at line 193 of file yin.c.


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