placea.c File Reference

#include "f2c.h"

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Functions
int	placea_ (integer *ipitch, integer *voibuf, integer *obound, integer *af, integer *vwin, integer *awin, integer *ewin, integer *lframe, integer *maxwin)

Function Documentation

placea_()

int placea_ ( integer *  ipitch, integer *  voibuf, integer *  obound, integer *  af, integer *  vwin, integer *  awin, integer *  ewin, integer *  lframe, integer *  maxwin  )

extern

Definition at line 116 of file placea.c.

{
    /* System generated locals */
    real r__1;
 
    /* Builtin functions */
    integer i_nint(real *);
 
    /* Local variables */
    logical allv, winv;
    integer i__, j, k, l, hrange;
    logical ephase;
    integer lrange;
 
/*       Arguments */
/*       Local variables that need not be saved */
    /* Parameter adjustments */
    ewin -= 3;
    awin -= 3;
    vwin -= 3;
    --voibuf;
 
    /* Function Body */
    lrange = (*af - 2) * *lframe + 1;
    hrange = *af * *lframe;
/*   Place the Analysis window based on the voicing window */
/*   placement, onsets, tentative voicing decision, and pitch. */
 
/*   Case 1:  Sustained Voiced Speech */
/*   If the five most recent voicing decisions are */
/*   voiced, then the window is placed phase-synchronously with the */
/*   previous window, as close to the present voicing window if possible.
*/
/*   If onsets bound the voicing window, then preference is given to */
/*   a phase-synchronous placement which does not overlap these onsets. */
 
/*   Case 2:  Voiced Transition */
/*   If at least one voicing decision in AF is voiced, and there are no
*/
/*   onsets, then the window is placed as in case 1. */
 
/*   Case 3:  Unvoiced Speech or Onsets */
/*   If both voicing decisions in AF are unvoiced, or there are onsets, */
/*   then the window is placed coincident with the voicing window. */
 
/*   Note:  During phase-synchronous placement of windows, the length */
/*   is not altered from MAXWIN, since this would defeat the purpose */
/*   of phase-synchronous placement. */
/* Check for case 1 and case 2 */
    allv = voibuf[((*af - 2) << 1) + 2] == 1;
    allv = allv && voibuf[((*af - 1) << 1) + 1] == 1;
    allv = allv && voibuf[((*af - 1) << 1) + 2] == 1;
    allv = allv && voibuf[(*af << 1) + 1] == 1;
    allv = allv && voibuf[(*af << 1) + 2] == 1;
    winv = voibuf[(*af << 1) + 1] == 1 || voibuf[(*af << 1) + 2] == 1;
    if (allv || (winv && *obound == 0)) {
/* APHASE:  Phase synchronous window placement. */
/* Get minimum lower index of the window. */
    i__ = (lrange + *ipitch - 1 - awin[((*af - 1) << 1) + 1]) / *ipitch;
    i__ *= *ipitch;
    i__ += awin[((*af - 1) << 1) + 1];
/* L = the actual length of this frame's analysis window. */
    l = *maxwin;
/* Calculate the location where a perfectly centered window would star
t. */
    k = (vwin[(*af << 1) + 1] + vwin[(*af << 1) + 2] + 1 - l) / 2;
/* Choose the actual location to be the pitch multiple closest to this
. */
    r__1 = (real) (k - i__) / *ipitch;
    awin[(*af << 1) + 1] = i__ + i_nint(&r__1) * *ipitch;
    awin[(*af << 1) + 2] = awin[(*af << 1) + 1] + l - 1;
/* If there is an onset bounding the right of the voicing window and t
he */
/* analysis window overlaps that, then move the analysis window backwa
rd */
/* to avoid this onset. */
    if (*obound >= 2 && awin[(*af << 1) + 2] > vwin[(*af << 1) + 2]) {
        awin[(*af << 1) + 1] -= *ipitch;
        awin[(*af << 1) + 2] -= *ipitch;
    }
/* Similarly for the left of the voicing window. */
    if ((*obound == 1 || *obound == 3) && awin[(*af << 1) + 1] < vwin[(*
        af << 1) + 1]) {
        awin[(*af << 1) + 1] += *ipitch;
        awin[(*af << 1) + 2] += *ipitch;
    }
/* If this placement puts the analysis window above HRANGE, then */
/* move it backward an integer number of pitch periods. */
    while(awin[(*af << 1) + 2] > hrange) {
        awin[(*af << 1) + 1] -= *ipitch;
        awin[(*af << 1) + 2] -= *ipitch;
    }
/* Similarly if the placement puts the analysis window below LRANGE.
*/
    while(awin[(*af << 1) + 1] < lrange) {
        awin[(*af << 1) + 1] += *ipitch;
        awin[(*af << 1) + 2] += *ipitch;
    }
/* Make Energy window be phase-synchronous. */
    ephase = TRUE_;
/* Case 3 */
    } else {
    awin[(*af << 1) + 1] = vwin[(*af << 1) + 1];
    awin[(*af << 1) + 2] = vwin[(*af << 1) + 2];
    ephase = FALSE_;
    }
/* RMS is computed over an integer number of pitch periods in the analysis
 */
/*window.  When it is not placed phase-synchronously, it is placed as clos
e*/
/* as possible to onsets. */
    j = (awin[(*af << 1) + 2] - awin[(*af << 1) + 1] + 1) / *ipitch * *ipitch;
    if (j == 0 || ! winv) {
    ewin[(*af << 1) + 1] = vwin[(*af << 1) + 1];
    ewin[(*af << 1) + 2] = vwin[(*af << 1) + 2];
    } else if (! ephase && *obound == 2) {
    ewin[(*af << 1) + 1] = awin[(*af << 1) + 2] - j + 1;
    ewin[(*af << 1) + 2] = awin[(*af << 1) + 2];
    } else {
    ewin[(*af << 1) + 1] = awin[(*af << 1) + 1];
    ewin[(*af << 1) + 2] = awin[(*af << 1) + 1] + j - 1;
    }
    return 0;
} /* placea_ */

References FALSE_, i_nint(), lframe, and TRUE_.

Referenced by analys_().