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Revision 1.1.1.1 2001/11/19 19:50:15 smorlat
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Revision 1.1.1.1 2001/08/08 21:29:08 simon
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* Revision 1.2 1996/08/20 20:25:29 jaf
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* Removed all static local variables that were SAVE'd in the Fortran
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* code, and put them in struct lpc10_encoder_state that is passed as an
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* Removed init function, since all initialization is now done in
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* init_lpc10_encoder_state().
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* Revision 1.1 1996/08/19 22:32:26 jaf
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#ifdef P_R_O_T_O_T_Y_P_E_S
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extern int dyptrk_(real *amdf, integer *ltau, integer *minptr, integer *voice, integer *pitch, integer *midx, struct lpc10_encoder_state *st);
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/* comlen contrl_ 12 */
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/* -- translated by f2c (version 19951025).
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You must link the resulting object file with the libraries:
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-lf2c -lm (in that order)
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/* Common Block Declarations */
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integer order, lframe;
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#define contrl_1 contrl_
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/* ********************************************************************* */
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/* DYPTRK Version 52 */
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/* Revision 1.1.1.1 2001/11/19 19:50:15 smorlat
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/* Revision 1.1.1.1 2001/08/08 21:29:08 simon
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* Revision 1.2 1996/08/20 20:25:29 jaf
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* Removed all static local variables that were SAVE'd in the Fortran
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* code, and put them in struct lpc10_encoder_state that is passed as an
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* Removed init function, since all initialization is now done in
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* init_lpc10_encoder_state().
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* Revision 1.1 1996/08/19 22:32:26 jaf
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/* Revision 1.5 1996/03/26 19:35:35 jaf */
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/* Commented out trace statements. */
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/* Revision 1.4 1996/03/19 18:03:22 jaf */
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/* Replaced the initialization "DATA P/60*DEPTH*0/" with "DATA P/120*0/", */
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/* because apparently Fortran (or at least f2c) can't handle expressions */
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/* Revision 1.3 1996/03/19 17:38:32 jaf */
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/* Added comments about the local variables that should be saved from one */
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/* invocation to the next. None of them were given initial values in the */
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/* original code, but from my testing, it appears that initializing them */
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/* Added entry INITDYPTRK to reinitialize these local variables. */
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/* Revision 1.2 1996/03/13 16:32:17 jaf */
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/* Comments added explaining which of the local variables of this */
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/* subroutine need to be saved from one invocation to the next, and which */
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/* WARNING! Some of them that should are never given initial values in */
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/* this code. Hopefully, Fortran 77 defines initial values for them, but */
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/* even so, giving them explicit initial values is preferable. */
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/* Revision 1.1 1996/02/07 14:45:14 jaf */
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/* Initial revision */
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/* ********************************************************************* */
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/* Dynamic Pitch Tracker */
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/* AMDF - Average Magnitude Difference Function array */
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/* Indices 1 through LTAU read, and MINPTR */
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/* LTAU - Number of lags in AMDF */
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/* MINPTR - Location of minimum AMDF value */
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/* VOICE - Voicing decision */
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/* PITCH - Smoothed pitch value, 2 frames delayed */
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/* MIDX - Initial estimate of current frame pitch */
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/* Compile time constant: */
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/* DEPTH - Number of frames to trace back */
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/* This subroutine maintains local state from one call to the next. If */
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/* you want to switch to using a new audio stream for this filter, or */
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/* reinitialize its state for any other reason, call the ENTRY */
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/* Subroutine */ int dyptrk_(real *amdf, integer *ltau, integer *
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minptr, integer *voice, integer *pitch, integer *midx,
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struct lpc10_encoder_state *st)
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/* Initialized data */
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/* System generated locals */
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/* Local variables */
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integer path[2], iptr, i__, j;
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real alpha, minsc, maxsc;
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/* $Log: dyptrk.c,v $
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/* Revision 1.1.1.1 2001/11/19 19:50:15 smorlat
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/* Revision 1.1.1.1 2001/08/08 21:29:08 simon
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* Revision 1.2 1996/08/20 20:25:29 jaf
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* Removed all static local variables that were SAVE'd in the Fortran
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* code, and put them in struct lpc10_encoder_state that is passed as an
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* Removed init function, since all initialization is now done in
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* init_lpc10_encoder_state().
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* Revision 1.1 1996/08/19 22:32:26 jaf
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/* Revision 1.3 1996/03/29 22:05:55 jaf */
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/* Commented out the common block variables that are not needed by the */
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/* embedded version. */
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/* Revision 1.2 1996/03/26 19:34:50 jaf */
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/* Added comments indicating which constants are not needed in an */
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/* application that uses the LPC-10 coder. */
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/* Revision 1.1 1996/02/07 14:44:09 jaf */
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/* Initial revision */
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/* LPC Processing control variables: */
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/* *** Read-only: initialized in setup */
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/* Files for Speech, Parameter, and Bitstream Input & Output, */
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/* and message and debug outputs. */
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/* Here are the only files which use these variables: */
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/* lpcsim.f setup.f trans.f error.f vqsetup.f */
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/* Many files which use fdebug are not listed, since it is only used in */
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/* those other files conditionally, to print trace statements. */
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/* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
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/* LPC order, Frame size, Quantization rate, Bits per frame, */
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/* Error correction */
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/* Subroutine SETUP is the only place where order is assigned a value, */
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/* and that value is 10. It could increase efficiency 1% or so to */
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/* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
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/* a variable in a COMMON block, since it is used in many places in the */
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/* core of the coding and decoding routines. Actually, I take that back.
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/* At least when compiling with f2c, the upper bound of DO loops is */
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/* stored in a local variable before the DO loop begins, and then that is
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/* compared against on each iteration. */
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/* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
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/* Similarly for quant, which is given a value of 2400 in SETUP. quant */
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/* is used in only a few places, and never in the core coding and */
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/* decoding routines, so it could be eliminated entirely. */
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/* nbits is similar to quant, and is given a value of 54 in SETUP. */
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/* corrp is given a value of .TRUE. in SETUP, and is only used in the */
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/* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
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/* coder significantly whether it is .TRUE. or .FALSE., or whether it is
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/* a constant or a variable, since it is only examined once per frame. */
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/* Leaving it as a variable that is set to .TRUE. seems like a good */
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/* idea, since it does enable some error-correction capability for */
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/* unvoiced frames, with no change in the coding rate, and no noticeable
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/* quality difference in the decoded speech. */
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/* integer quant, nbits */
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/* *** Read/write: variables for debugging, not needed for LPC algorithm
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/* Current frame, Unstable frames, Output clip count, Max onset buffer,
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/* Debug listing detail level, Line count on listing page */
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/* nframe is not needed for an embedded LPC10 at all. */
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/* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
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/* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
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/* an application, I would recommend removing the call to ERROR in RCCHK,
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/* and remove ERROR and nunsfm completely. */
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/* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
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/* sread.f. When LPC10 is embedded into an application, one might want */
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/* to cause it to be incremented in a routine that takes the output of */
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/* SYNTHS and sends it to an audio device. It could be optionally */
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/* displayed, for those that might want to know what it is. */
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/* maxosp is never initialized to 0 in SETUP, although it probably should
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/* be, and it is updated in subroutine ANALYS. I doubt that its value */
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/* would be of much interest to an application in which LPC10 is */
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/* listl and lincnt are not needed for an embedded LPC10 at all. */
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/* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
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/* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
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/* common /contrl/ quant, nbits */
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/* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
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/* Parameters/constants */
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/* Local variables that need not be saved */
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/* Note that PATH is only used for debugging purposes, and can be */
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/* It would be a bit more "general" to define S(LTAU), if Fortran */
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/* allows the argument of a function to be used as the dimension of
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/* a local array variable. */
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/* IPOINT is always in the range 0 to DEPTH-1. */
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/* In the original version of this subroutine, IPOINT, ALPHAX, */
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/* every element of S, and potentially any element of P with the */
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/* second index value .NE. IPTR were read without being given */
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/* initial values (all indices of P with second index equal to */
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/* IPTR are all written before being read in this subroutine). */
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/* From examining the code carefully, it appears that all of these
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/* should be saved from one invocation to the next. */
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/* I've run lpcsim with the "-l 6" option to see all of the */
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/* debugging information that is printed out by this subroutine */
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/* below, and it appears that S, P, IPOINT, and ALPHAX are all */
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/* initialized to 0 (these initial values would likely be different
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/* on different platforms, compilers, etc.). Given that the output
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/* of the coder sounds reasonable, I'm going to initialize these */
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/* variables to 0 explicitly. */
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ipoint = &(st->ipoint);
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alphax = &(st->alphax);
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/* Parameter adjustments */
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/* Calculate the confidence factor ALPHA, used as a threshold slope in
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/* SEESAW. If unvoiced, set high slope so that every point in P array
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/* is marked as a potential pitch frequency. A scaled up version (ALPHAX
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/* is used to maintain arithmetic precision. */
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*alphax = *alphax * .75f + amdf[*minptr] / 2.f;
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alpha = *alphax / 16;
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if (*voice == 0 && *alphax < 128.f) {
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/* SEESAW: Construct a pitch pointer array and intermediate winner functio
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/* Left to right pass: */
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p[iptr * 60 - 60] = 1;
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for (i__ = 1; i__ <= i__1; ++i__) {
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if (sbar < s[i__ - 1]) {
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p[i__ + iptr * 60 - 61] = pbar;
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p[i__ + iptr * 60 - 61] = i__;
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/* Right to left pass: */
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if (sbar < s[i__ - 1]) {
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p[i__ + iptr * 60 - 61] = pbar;
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pbar = p[i__ + iptr * 60 - 61];
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/* Update S using AMDF */
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/* Find maximum, minimum, and location of minimum */
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for (i__ = 2; i__ <= i__1; ++i__) {
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s[i__ - 1] += amdf[i__] / 2;
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if (s[i__ - 1] > maxsc) {
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if (s[i__ - 1] < minsc) {
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/* Subtract MINSC from S to prevent overflow */
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for (i__ = 1; i__ <= i__1; ++i__) {
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/* Use higher octave pitch if significant null there */
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for (i__ = 20; i__ <= 40; i__ += 10) {
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if (s[*midx - i__ - 1] < maxsc / 4) {
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/* TRACE: look back two frames to find minimum cost pitch estimate */
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for (i__ = 1; i__ <= 2; ++i__) {
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*pitch = p[*pitch + j * 60 - 61];
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path[i__ - 1] = *pitch;
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/* The following statement subtracts one from IPOINT, mod DEPTH. I
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/* think the author chose to add DEPTH-1, instead of subtracting 1,
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/* because then it will work even if MOD doesn't work as desired on
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/* negative arguments. */
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*ipoint = (*ipoint + 1) % 2;
added
removed
lpc10-1.5/dyptrk.c
