Implementation of pitch extraction. More...

#include "sphinxbase/prim_type.h"
#include "sphinxbase/ckd_alloc.h"
#include "sphinxbase/fixpoint.h"
#include "sphinxbase/yin.h"
#include <stdio.h>
#include <string.h>

Data Structures
struct	yin_s

Functions
yin_t *	yin_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.
int	thresholded_search (int32 *diff_window, fixed32 threshold, int start, int end)
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 extraction.

Author: David Huggins-Daines dhugg.nosp@m.ins@.nosp@m.cs.cm.nosp@m.u.ed.nosp@m.u

Definition in file yin.c.

Function Documentation

◆ thresholded_search()

int thresholded_search	(	int32 *	diff_window,
		fixed32	threshold,
		int	start,
		int	end )

Definition at line 172 of file yin.c.

◆ yin_end()

void yin_end ( yin_t * pe )

Mark the end of an utterance.

Definition at line 166 of file yin.c.

References yin_s::endut.

◆ yin_free()

void yin_free ( yin_t * pe )

Free a moving-window pitch estimator.

Definition at line 150 of file yin.c.

References ckd_free(), ckd_free_2d(), yin_s::diff_window, and yin_s::period_window.

◆ yin_init()

yin_t * yin_init	(	int	frame_size,
		float	search_threshold,
		float	search_range,
		int	smooth_window )

Initialize moving-window pitch estimation.

Definition at line 131 of file yin.c.

References ckd_calloc, ckd_calloc_2d, yin_s::diff_window, yin_s::period_window, yin_s::search_range, yin_s::search_threshold, and yin_s::wsize.

◆ yin_read()

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 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::search_threshold, yin_s::wcur, yin_s::wsize, and yin_s::wstart.

◆ yin_start()

void yin_start ( yin_t * pe )

Start processing an utterance.

Definition at line 158 of file yin.c.

References yin_s::endut, yin_s::nfr, and yin_s::wstart.

◆ yin_write()

void yin_write	(	yin_t *	pe,
		int16 const *	frame )

Feed a frame of data to the pitch estimator.