placev.c File Reference

#include "f2c.h"

Include dependency graph for placev.c:

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Functions
int	placev_ (integer *osbuf, integer *osptr, integer *oslen, integer *obound, integer *vwin, integer *af, integer *lframe, integer *minwin, integer *maxwin, integer *dvwinl, integer *dvwinh)

Function Documentation

placev_()

int placev_	(	integer *	osbuf,
		integer *	osptr,
		integer *	oslen,
		integer *	obound,
		integer *	vwin,
		integer *	af,
		integer *	lframe,
		integer *	minwin,
		integer *	maxwin,
		integer *	dvwinl,
		integer *	dvwinh
	)

Definition at line 112 of file placev.c.

{
    /* System generated locals */
    integer i__1, i__2;
 
    /* Local variables */
    logical crit;
    integer i__, q, osptr1, hrange, lrange;
 
/*       Arguments */
/*       Local variables that need not be saved */
/*   Variables */
/*    LRANGE, HRANGE  Range in which window is placed */
/*    OSPTR1     OSPTR excluding samples in 3F */
/*       Local state */
/*       None */
/*   Voicing Window Placement */
 
/*         __________________ __________________ ______________ */
/*        |                  |                  | */
/*        |        1F        |        2F        |        3F ... */
/*        |__________________|__________________|______________ */
 
/*    Previous | */
/*      Window | */
/*  ...________| */
 
/*             |                                | */
/*      ------>| This window's placement range  |<------ */
/*             |                                | */
 
/*   There are three cases.  Note that these are different from those */
/*   given in the LPC-10e phase 1 report. */
 
/*   1.  If there are no onsets in this range, then the voicing window */
/*   is centered in the pitch window.  If such a placement is not within
*/
/*   the window's placement range, then the window is placed in the left-
*/
/*   most portion of the placement range.  Its length is always MAXWIN. */
 
/*   2.  If the first onset is in 2F and there is sufficient room to place
 */
/*   the window immediately before this onset, then the window is placed
*/
/*   there, and its length is set to the maximum possible under these */
/*   constraints. */
 
/*  "Critical Region Exception":  If there is another onset in 2F */
/*  such that a window can be placed between the two onsets, the */
/*  window is placed there (ie, as in case 3). */
 
/*   3.  Otherwise, the window is placed immediately after the onset.  The
 */
/*   window's length */
/*  is the longest length that can fit in the range under these constraint
s,*/
/*  except that the window may be shortened even further to avoid overlapp
ing*/
/*  other onsets in the placement range.  In any case, the window's length
*/
/*   is at least MINWIN. */
 
/*   Note that the values of MINWIN and LFRAME must be chosen such */
/*   that case 2 = false implies case 3 = true.   This means that */
/*   MINWIN <= LFRAME/2.  If this were not the case, then a fourth case */
/*   would have to be added for when the window cannot fit either before
*/
/*   or after the onset. */
 
/*   Note also that onsets which weren't in 2F last time may be in 1F this
 */
/*  time, due to the filter delays in computing onsets.  The result is tha
t*/
/*   occasionally a voicing window will overlap that onset.  The only way
*/
/*   to circumvent this problem is to add more delay in processing input
*/
/*   speech.  In the trade-off between delay and window-placement, window
*/
/*   placement lost. */
/* Compute the placement range */
    /* Parameter adjustments */
    --osbuf;
    vwin -= 3;
 
    /* Function Body */
/* Computing MAX */
    i__1 = vwin[((*af - 1) << 1) + 2] + 1, i__2 = (*af - 2) * *lframe + 1;
    lrange = max(i__1,i__2);
    hrange = *af * *lframe;
/* Compute OSPTR1, so the following code only looks at relevant onsets. */
    for (osptr1 = *osptr - 1; osptr1 >= 1; --osptr1) {
    if (osbuf[osptr1] <= hrange) {
        goto L90;
    }
    }
L90:
    ++osptr1;
/* Check for case 1 first (fast case): */
    if (osptr1 <= 1 || osbuf[osptr1 - 1] < lrange) {
/* Computing MAX */
    i__1 = vwin[((*af - 1) << 1) + 2] + 1;
    vwin[(*af << 1) + 1] = max(i__1,*dvwinl);
    vwin[(*af << 1) + 2] = vwin[(*af << 1) + 1] + *maxwin - 1;
    *obound = 0;
    } else {
/* Search backward in OSBUF for first onset in range. */
/* This code relies on the above check being performed first. */
    for (q = osptr1 - 1; q >= 1; --q) {
        if (osbuf[q] < lrange) {
        goto L100;
        }
    }
L100:
    ++q;
/* Check for case 2 (placement before onset): */
/* Check for critical region exception: */
    i__1 = osptr1 - 1;
    for (i__ = q + 1; i__ <= i__1; ++i__) {
        if (osbuf[i__] - osbuf[q] >= *minwin) {
        crit = TRUE_;
        goto L105;
        }
    }
    crit = FALSE_;
L105:
/* Computing MAX */
    i__1 = (*af - 1) * *lframe, i__2 = lrange + *minwin - 1;
    if (! crit && osbuf[q] > max(i__1,i__2)) {
        vwin[(*af << 1) + 2] = osbuf[q] - 1;
/* Computing MAX */
        i__1 = lrange, i__2 = vwin[(*af << 1) + 2] - *maxwin + 1;
        vwin[(*af << 1) + 1] = max(i__1,i__2);
        *obound = 2;
/* Case 3 (placement after onset) */
    } else {
        vwin[(*af << 1) + 1] = osbuf[q];
L110:
        ++q;
        if (q >= osptr1) {
        goto L120;
        }
        if (osbuf[q] > vwin[(*af << 1) + 1] + *maxwin) {
        goto L120;
        }
        if (osbuf[q] < vwin[(*af << 1) + 1] + *minwin) {
        goto L110;
        }
        vwin[(*af << 1) + 2] = osbuf[q] - 1;
        *obound = 3;
        return 0;
L120:
/* Computing MIN */
        i__1 = vwin[(*af << 1) + 1] + *maxwin - 1;
        vwin[(*af << 1) + 2] = min(i__1,hrange);
        *obound = 1;
    }
    }
    return 0;
} /* placev_ */

References FALSE_, lframe, max, min, and TRUE_.

Referenced by analys_().