/usr/include/jkFormant.h is in libsnack2-dev 2.2.10-dfsg1-12build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* This software has been licensed to the Centre of Speech Technology, KTH
* by AT&T Corp. and Microsoft Corp. with the terms in the accompanying
* file BSD.txt, which is a BSD style license.
*
* "Copyright (c) 1987-1990 AT&T, Inc.
* "Copyright (c) 1986-1990 Entropic Speech, Inc.
* "Copyright (c) 1990-1991 Entropic Research Laboratory, Inc.
* All rights reserved"
*/
/* this is an older version of the waves tracks.h needed for this version
of formant
*/
#define DEB_PAUSE 8 /* debug levels */
#define DEB_LPC_PARS 4
#define DEB_PARAMS 2
#define DEB_ENTRY 1
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
#define PI 3.1415927
#define MAXFORMANTS 7
/* structure definitions for the pitch tracker */
#define CROSS struct cross_rec
struct cross_rec { /* for storing the crosscorrelation information */
double rms; /* rms energy in the reference window */
double k1; /* 1st-order autoregressive flattening constant. */
double maxval; /* max in the crosscorr. fun. q15 */
short maxloc; /* lag # at which max occured */
short nlags; /* the number of correlation lags computed */
short firstlag; /* the first non-zero lag computed */
short *correl; /* the normalized corsscor. fun. q15 */
};
#define DPREC struct dp_rec
struct dp_rec { /* for storing the DP information */
short ncands; /* # of candidate pitch intervals in the frame */
short *locs; /* locations of the candidates */
short *pvals; /* peak values of the candidates */
double *mpvals; /* modified peak values of the candidates */
short *prept; /* pointers to best previous cands. */
double *dpvals; /* cumulative error for each candidate */
};
/* end of structure definitions for the pitch tracker */
/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
/* Structure definitions for the formant tracker.. */
typedef struct form_latt { /* structure of a DP lattice node for formant tracking */
short ncand; /* # of candidate mappings for this frame */
short **cand; /* pole-to-formant map-candidate array */
short *prept; /* backpointer array for each frame */
double *cumerr; /* cum. errors associated with each cand. */
} FORM;
typedef struct pole_array { /* structure to hold raw LPC analysis data */
double rms; /* rms for current LPC analysis frame */
double rms2; /* rms for current F0 analysis frame */
double f0; /* fundamental frequency estimate for this frame */
double pv; /* probability that frame is voiced */
double change; /* spec. distance between current and prev. frames */
short npoles; /* # of complex poles from roots of LPC polynomial */
double *freq; /* array of complex pole frequencies (Hz) */
double *band; /* array of complex pole bandwidths (Hz) */
} POLE;
/* End of structure definitions for the formant tracker. */
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