184 lines
5.7 KiB
C
184 lines
5.7 KiB
C
/*
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$Log: tbdm.c,v $
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Revision 1.1 2004/05/04 11:16:43 csoutheren
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Initial version
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Revision 1.2 2002/02/15 03:57:55 yurik
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Warnings removed during compilation, patch courtesy of Jehan Bing, jehan@bravobrava.com
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Revision 1.1 2000/06/05 04:45:12 robertj
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Added LPC-10 2400bps codec
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* Revision 1.1 1996/08/19 22:30:26 jaf
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* Initial revision
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*
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*/
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#ifdef P_R_O_T_O_T_Y_P_E_S
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extern int tbdm_(real *speech, integer *lpita, integer *tau, integer *ltau, real *amdf, integer *minptr, integer *maxptr, integer *mintau);
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/*:ref: difmag_ 14 8 6 4 4 4 4 6 4 4 */
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#endif
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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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*/
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#include "f2c.h"
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/* ********************************************************************** */
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/* TBDM Version 49 */
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/* $Log: tbdm.c,v $
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* Revision 1.1 2004/05/04 11:16:43 csoutheren
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* Initial version
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*
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* Revision 1.2 2002/02/15 03:57:55 yurik
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* Warnings removed during compilation, patch courtesy of Jehan Bing, jehan@bravobrava.com
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*
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* Revision 1.1 2000/06/05 04:45:12 robertj
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* Added LPC-10 2400bps codec
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*
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* Revision 1.1 1996/08/19 22:30:26 jaf
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* Initial revision
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*
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*/
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/* Revision 1.3 1996/03/18 22:14:00 jaf */
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/* Just added a few comments about which array indices of the arguments */
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/* are used, and mentioning that this subroutine has no local state. */
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/* Revision 1.2 1996/03/13 14:48:37 jaf */
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/* Comments added explaining that none of the local variables of this */
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/* subroutine need to be saved from one invocation to the next. */
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/* Revision 1.1 1996/02/07 14:49:54 jaf */
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/* Initial revision */
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/* ********************************************************************* */
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/*TURBO DIFMAG: Compute High Resolution Average Magnitude Difference Function
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*/
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/* Note: There are several constants in here that appear to depend on a */
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/* particular TAU table. That's not a problem for the LPC10 coder, but */
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/* watch out if you change the contents of TAU in the subroutine ANALYS. */
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/* Input: */
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/* SPEECH - Low pass filtered speech */
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/* Indices 1 through MAX+LPITA-1 are read, where: */
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/* MAX = (TAU(LTAU)-TAU(1))/2+1 */
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/* (If TAU(1) .LT. 39, then larger indices could be read */
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/* by the last call to DIFMAG below.) */
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/* LPITA - Length of speech buffer */
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/* TAU - Table of lags, sorted in increasing order. */
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/* Indices 1 through LTAU read. */
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/* LTAU - Number of lag values to compute */
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/* Output: */
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/* AMDF - Average Magnitude Difference for each lag in TAU */
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/* Indices 1 through LTAU written, and several might then be read.*/
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/* MINPTR - Index of minimum AMDF value */
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/* MAXPTR - Index of maximum AMDF value within +/- 1/2 octave of min */
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/* MINTAU - Lag corresponding to minimum AMDF value */
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/* This subroutine has no local state. */
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/* Subroutine */ int tbdm_(real *speech, integer *lpita, integer *tau,
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integer *ltau, real *amdf, integer *minptr, integer *maxptr, integer *
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mintau)
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{
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/* System generated locals */
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integer i__1, i__2, i__3, i__4;
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/* Local variables */
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real amdf2[6];
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integer minp2, ltau2, maxp2, i__;
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extern /* Subroutine */ int difmag_(real *, integer *, integer *, integer
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*, integer *, real *, integer *, integer *);
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integer minamd, ptr, tau2[6];
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/* Arguments */
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/* REAL SPEECH(LPITA+TAU(LTAU)), AMDF(LTAU) */
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/* Stupid TOAST doesn't understand expressions */
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/* Local variables that need not be saved */
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/* Local state */
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/* None */
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/* Compute full AMDF using log spaced lags, find coarse minimum */
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/* Parameter adjustments */
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--speech;
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--amdf;
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--tau;
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/* Function Body */
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difmag_(&speech[1], lpita, &tau[1], ltau, &tau[*ltau], &amdf[1], minptr,
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maxptr);
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*mintau = tau[*minptr];
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minamd = (integer)amdf[*minptr];
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/* Build table containing all lags within +/- 3 of the AMDF minimum */
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/* excluding all that have already been computed */
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ltau2 = 0;
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ptr = *minptr - 2;
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/* Computing MAX */
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i__1 = *mintau - 3;
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/* Computing MIN */
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i__3 = *mintau + 3, i__4 = tau[*ltau] - 1;
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i__2 = min(i__3,i__4);
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for (i__ = max(i__1,41); i__ <= i__2; ++i__) {
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while(tau[ptr] < i__) {
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++ptr;
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}
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if (tau[ptr] != i__) {
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++ltau2;
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tau2[ltau2 - 1] = i__;
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}
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}
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/* Compute AMDF of the new lags, if there are any, and choose one */
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/* if it is better than the coarse minimum */
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if (ltau2 > 0) {
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difmag_(&speech[1], lpita, tau2, <au2, &tau[*ltau], amdf2, &minp2, &
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maxp2);
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if (amdf2[minp2 - 1] < (real) minamd) {
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*mintau = tau2[minp2 - 1];
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minamd = (integer)amdf2[minp2 - 1];
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}
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}
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/* Check one octave up, if there are any lags not yet computed */
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if (*mintau >= 80) {
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i__ = *mintau / 2;
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if ((i__ & 1) == 0) {
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ltau2 = 2;
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tau2[0] = i__ - 1;
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tau2[1] = i__ + 1;
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} else {
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ltau2 = 1;
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tau2[0] = i__;
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}
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difmag_(&speech[1], lpita, tau2, <au2, &tau[*ltau], amdf2, &minp2, &
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maxp2);
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if (amdf2[minp2 - 1] < (real) minamd) {
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*mintau = tau2[minp2 - 1];
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minamd = (integer)amdf2[minp2 - 1];
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*minptr += -20;
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}
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}
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/* Force minimum of the AMDF array to the high resolution minimum */
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amdf[*minptr] = (real) minamd;
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/* Find maximum of AMDF within 1/2 octave of minimum */
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/* Computing MAX */
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i__2 = *minptr - 5;
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*maxptr = max(i__2,1);
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/* Computing MIN */
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i__1 = *minptr + 5;
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i__2 = min(i__1,*ltau);
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for (i__ = *maxptr + 1; i__ <= i__2; ++i__) {
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if (amdf[i__] > amdf[*maxptr]) {
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*maxptr = i__;
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}
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}
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return 0;
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} /* tbdm_ */
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