Collaboration diagram for Pitchmarking Functions:

Functions
EST_Track	pitchmark (EST_Wave &lx, EST_Features &op)

EST_Track	pitchmark (EST_Wave &lx, int lx_lf, int lx_lo, int lx_hf, int lx_ho, int df_lf, int df_lo, int mo, int debug=0)

void	neg_zero_cross_pick (EST_Wave &lx, EST_Track &pm)

void	pm_fill (EST_Track &pm, float new_end, float max, float min, float def)

void	pm_min_check (EST_Track &pm, float min)

void	pm_to_f0 (EST_Track &pm, EST_Track &f0)

void	pm_to_f0 (EST_Track &pm, EST_Track &fz, float shift)

Detailed Description

Pitchmarking involves finding some pre-defined pitch related instant for every pitch period in the speech. At present, only functions for analysing laryngograph waveforms are available - the much harder problem of doing this on actual speech has not been attempted.

Function Documentation

EST_Track pitchmark	(	EST_Wave &	lx,
		EST_Features &	op
	)

Find pitchmarks in Laryngograph (lx) signal.

This high level function places a pitchmark on each positive peak in the voiced portions of the lx signal. Pitchmarks are stored in the time component of a EST_Track object and returned. The function works by high and low pass filtering the signal using forward and backward filtering to remove phase shift. The negative going points in the smoothed differentiated signal, corresponding to peaks in the original are then chosen.

Parameters

lx	laryngograph waveform
op	{options, mainly for filter control: lx_low_frequency low pass cut off for lx filtering : typical value `400` lx_low_order order of low pass lx filter: typical value 19 lx_high_frequency high pass cut off for lx filtering: typical value 40 lx_high_order order of high pass lx filter: typical value 19 median_order order of high pass lx filter: typical value 19 }

Definition at line 105 of file pitchmark.cc.

EST_Track pitchmark	(	EST_Wave &	lx,
		int	lx_lf,
		int	lx_lo,
		int	lx_hf,
		int	lx_ho,
		int	df_lf,
		int	df_lo,
		int	mo,
		int	debug = `0`
	)

Find pitchmarks in Laryngograph (lx) signal. The function is the same as pitchmark but with more explicit control over the parameters.

Parameters

lx	laryngograph waveform
lx_lf	low pass cut off for lx filtering : typical value 400
lx_fo	order of low pass lx filter : typical value 19
lx_hf	high pass cut off for lx filtering : typical value 40
lx_ho	: typical value 19
mo	order of median smoother used to smoother differentiated lx : typical value 19

Definition at line 57 of file pitchmark.cc.

void neg_zero_cross_pick	(	EST_Wave &	lx,
		EST_Track &	pm
	)

Find times where waveform cross zero axis in negative direction.

Parameters

sig	waveform
pm	pitchmark track which stores time positions of negative crossings

Definition at line 233 of file pitchmark.cc.

void pm_fill	(	EST_Track &	pm,
		float	new_end,
		float	max,
		float	min,
		float	def
	)

Produce a set of sensible pitchmarks.

Given a set of raw pitchmarks, this function makes sure no pitch period is shorter that min seconds and no longer than max seconds. Periods that are too short are eliminated. If a period is too long, extra pitchmarks are inserted whose period is { approximately} def seconds in duration. The approximation is to ensure that the pitch period in the interval, D, is constant, and so the actual pitch period is given by

$T = D / floor(D/def)$

Definition at line 154 of file pitchmark.cc.

void pm_min_check	(	EST_Track &	pm,
		float	min
	)

Remove pitchmarks which are too close together.

This doesn't work in a particularly sophisticated way, in that it removes a sequence of too close pitchmarks left to right, and doesn't attempt to find which ones in the sequence are actually spurious.

Iterate through track and eliminate any frame whose distance to a preceding frames is less than min seconds

Definition at line 138 of file pitchmark.cc.

void pm_to_f0	(	EST_Track &	pm,
		EST_Track &	f0
	)

Definition at line 261 of file pitchmark.cc.

void pm_to_f0	(	EST_Track &	pm,
		EST_Track &	fz,
		float	shift
	)

Definition at line 274 of file pitchmark.cc.