#include "f2c.h"

Include dependency graph for dyptrk.c:

Macros
#define	contrl_1 contrl_

Functions
int	dyptrk_ (real amdf, integer ltau, integer minptr, integer voice, integer pitch, integer midx, struct lpc10_encoder_state *st)

Variables
struct {
logical corrp

integer lframe

integer order

}	contrl_

Macro Definition Documentation

◆ contrl_1

#define contrl_1 contrl_

Definition at line 49 of file dyptrk.c.

Function Documentation

◆ dyptrk_()

int dyptrk_	(	real *	amdf,
		integer *	ltau,
		integer *	minptr,
		integer *	voice,
		integer *	pitch,
		integer *	midx,
		struct lpc10_encoder_state *	st
	)

Definition at line 129 of file dyptrk.c.

References lpc10_encoder_state::alphax, lpc10_encoder_state::ipoint, lpc10_encoder_state::p, and lpc10_encoder_state::s.

Referenced by analys_().

 {
     /* Initialized data */
 
     real *s;
     integer *p;
     integer *ipoint;
     real *alphax;
 
     /* System generated locals */
     integer i__1;
 
     /* Local variables */
     integer pbar;
     real sbar;
     integer iptr, i__, j;
     real alpha, minsc, maxsc;
 
 /*       Arguments */
 /* $Log$
  * Revision 1.15  2004/06/26 03:50:14  markster
  * Merge source cleanups (bug #1911)
  *
  * Revision 1.14  2003/02/12 13:59:15  matteo
  * mer feb 12 14:56:57 CET 2003
  *
  * Revision 1.1.1.1  2003/02/12 13:59:15  matteo
  * mer feb 12 14:56:57 CET 2003
  *
  * Revision 1.2  2000/01/05 08:20:39  markster
  * Some OSS fixes and a few lpc changes to make it actually work
  *
  * Revision 1.2  1996/08/20  20:25:29  jaf
  * Removed all static local variables that were SAVE'd in the Fortran
  * code, and put them in struct lpc10_encoder_state that is passed as an
  * argument.
  *
  * Removed init function, since all initialization is now done in
  * init_lpc10_encoder_state().
  *
  * Revision 1.1  1996/08/19  22:32:26  jaf
  * Initial revision
  * */
 /* Revision 1.3  1996/03/29  22:05:55  jaf */
 /* Commented out the common block variables that are not needed by the */
 /* embedded version. */
 
 /* Revision 1.2  1996/03/26  19:34:50  jaf */
 /* Added comments indicating which constants are not needed in an */
 /* application that uses the LPC-10 coder. */
 
 /* Revision 1.1  1996/02/07  14:44:09  jaf */
 /* Initial revision */
 
 /*   LPC Processing control variables: */
 
 /* *** Read-only: initialized in setup */
 
 /*  Files for Speech, Parameter, and Bitstream Input & Output, */
 /*    and message and debug outputs. */
 
 /* Here are the only files which use these variables: */
 
 /* lpcsim.f setup.f trans.f error.f vqsetup.f */
 
 /* Many files which use fdebug are not listed, since it is only used in */
 /* those other files conditionally, to print trace statements. */
 /*    integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
 /*  LPC order, Frame size, Quantization rate, Bits per frame, */
 /*    Error correction */
 /* Subroutine SETUP is the only place where order is assigned a value, */
 /* and that value is 10.  It could increase efficiency 1% or so to */
 /* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
 */
 /* a variable in a COMMON block, since it is used in many places in the */
 /* core of the coding and decoding routines.  Actually, I take that back.
 */
 /* At least when compiling with f2c, the upper bound of DO loops is */
 /* stored in a local variable before the DO loop begins, and then that is
 */
 /* compared against on each iteration. */
 /* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
 /* Similarly for quant, which is given a value of 2400 in SETUP.  quant */
 /* is used in only a few places, and never in the core coding and */
 /* decoding routines, so it could be eliminated entirely. */
 /* nbits is similar to quant, and is given a value of 54 in SETUP. */
 /* corrp is given a value of .TRUE. in SETUP, and is only used in the */
 /* subroutines ENCODE and DECODE.  It doesn't affect the speed of the */
 /* coder significantly whether it is .TRUE. or .FALSE., or whether it is
 */
 /* a constant or a variable, since it is only examined once per frame. */
 /* Leaving it as a variable that is set to .TRUE.  seems like a good */
 /* idea, since it does enable some error-correction capability for */
 /* unvoiced frames, with no change in the coding rate, and no noticeable
 */
 /* quality difference in the decoded speech. */
 /*    integer quant, nbits */
 /* *** Read/write: variables for debugging, not needed for LPC algorithm
 */
 
 /*  Current frame, Unstable frames, Output clip count, Max onset buffer,
 */
 /*    Debug listing detail level, Line count on listing page */
 
 /* nframe is not needed for an embedded LPC10 at all. */
 /* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
 /* ERROR, which is only called from RCCHK.  When LPC10 is embedded into */
 /* an application, I would recommend removing the call to ERROR in RCCHK,
 */
 /* and remove ERROR and nunsfm completely. */
 /* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
 */
 /* sread.f.  When LPC10 is embedded into an application, one might want */
 /* to cause it to be incremented in a routine that takes the output of */
 /* SYNTHS and sends it to an audio device.  It could be optionally */
 /* displayed, for those that might want to know what it is. */
 /* maxosp is never initialized to 0 in SETUP, although it probably should
 */
 /* be, and it is updated in subroutine ANALYS.  I doubt that its value */
 /* would be of much interest to an application in which LPC10 is */
 /* embedded. */
 /* listl and lincnt are not needed for an embedded LPC10 at all. */
 /*    integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
 /*    common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
 /*    common /contrl/ quant, nbits */
 /*    common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
 /*    Parameters/constants */
 /*       Local variables that need not be saved */
 /*       Note that PATH is only used for debugging purposes, and can be */
 /*       removed. */
 /*       Local state */
 /*       It would be a bit more "general" to define S(LTAU), if Fortran */
 /*       allows the argument of a function to be used as the dimension of
 */
 /*       a local array variable. */
 /*       IPOINT is always in the range 0 to DEPTH-1. */
 /*       WARNING! */
 
 /*       In the original version of this subroutine, IPOINT, ALPHAX, */
 /*       every element of S, and potentially any element of P with the */
 /*       second index value .NE. IPTR were read without being given */
 /*       initial values (all indices of P with second index equal to */
 /*       IPTR are all written before being read in this subroutine). */
 
 /*       From examining the code carefully, it appears that all of these
 */
 /*       should be saved from one invocation to the next. */
 
 /*       I've run lpcsim with the "-l 6" option to see all of the */
 /*       debugging information that is printed out by this subroutine */
 /*       below, and it appears that S, P, IPOINT, and ALPHAX are all */
 /*       initialized to 0 (these initial values would likely be different
 */
 /*       on different platforms, compilers, etc.).  Given that the output
 */
 /*       of the coder sounds reasonable, I'm going to initialize these */
 /*       variables to 0 explicitly. */
 
     s = &(st->s[0]);
     p = &(st->p[0]);
     ipoint = &(st->ipoint);
     alphax = &(st->alphax);
 
 
     /* Parameter adjustments */
     if (amdf) {
    --amdf;
    }
 
     /* Function Body */
 
 /*   Calculate the confidence factor ALPHA, used as a threshold slope in
 */
 /*   SEESAW.  If unvoiced, set high slope so that every point in P array
 */
 /*  is marked as a potential pitch frequency.  A scaled up version (ALPHAX
 )*/
 /*   is used to maintain arithmetic precision. */
     if (*voice == 1) {
    *alphax = *alphax * .75f + amdf[*minptr] / 2.f;
     } else {
    *alphax *= .984375f;
     }
     alpha = *alphax / 16;
     if (*voice == 0 && *alphax < 128.f) {
    alpha = 8.f;
     }
 /* SEESAW: Construct a pitch pointer array and intermediate winner functio
 n*/
 /*   Left to right pass: */
     iptr = *ipoint + 1;
     p[iptr * 60 - 60] = 1;
     i__ = 1;
     pbar = 1;
     sbar = s[0];
     i__1 = *ltau;
     for (i__ = 1; i__ <= i__1; ++i__) {
    sbar += alpha;
    if (sbar < s[i__ - 1]) {
        s[i__ - 1] = sbar;
        p[i__ + iptr * 60 - 61] = pbar;
    } else {
        sbar = s[i__ - 1];
        p[i__ + iptr * 60 - 61] = i__;
        pbar = i__;
    }
     }
 /*   Right to left pass: */
     i__ = pbar - 1;
     sbar = s[i__];
     while(i__ >= 1) {
    sbar += alpha;
    if (sbar < s[i__ - 1]) {
        s[i__ - 1] = sbar;
        p[i__ + iptr * 60 - 61] = pbar;
    } else {
        pbar = p[i__ + iptr * 60 - 61];
        i__ = pbar;
        sbar = s[i__ - 1];
    }
    --i__;
     }
 /*   Update S using AMDF */
 /*   Find maximum, minimum, and location of minimum */
     s[0] += amdf[1] / 2;
     minsc = s[0];
     maxsc = minsc;
     *midx = 1;
     i__1 = *ltau;
     for (i__ = 2; i__ <= i__1; ++i__) {
    s[i__ - 1] += amdf[i__] / 2;
    if (s[i__ - 1] > maxsc) {
        maxsc = s[i__ - 1];
    }
    if (s[i__ - 1] < minsc) {
        *midx = i__;
        minsc = s[i__ - 1];
    }
     }
 /*   Subtract MINSC from S to prevent overflow */
     i__1 = *ltau;
     for (i__ = 1; i__ <= i__1; ++i__) {
    s[i__ - 1] -= minsc;
     }
     maxsc -= minsc;
 /*   Use higher octave pitch if significant null there */
     j = 0;
     for (i__ = 20; i__ <= 40; i__ += 10) {
    if (*midx > i__) {
        if (s[*midx - i__ - 1] < maxsc / 4) {
       j = i__;
        }
    }
     }
     *midx -= j;
 /*   TRACE: look back two frames to find minimum cost pitch estimate */
     j = *ipoint;
     *pitch = *midx;
     for (i__ = 1; i__ <= 2; ++i__) {
    j = j % 2 + 1;
    *pitch = p[*pitch + j * 60 - 61];
     }
 
 /*       The following statement subtracts one from IPOINT, mod DEPTH.  I
 */
 /*       think the author chose to add DEPTH-1, instead of subtracting 1,
 */
 /*       because then it will work even if MOD doesn't work as desired on
 */
 /*       negative arguments. */
 
     *ipoint = (*ipoint + 1) % 2;
     return 0;
 } /* dyptrk_ */