151 lines
3.9 KiB
C
151 lines
3.9 KiB
C
/*
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$Log$
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Revision 1.15 2004/06/26 03:50:14 markster
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Merge source cleanups (bug #1911)
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Revision 1.14 2003/02/12 13:59:15 matteo
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mer feb 12 14:56:57 CET 2003
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Revision 1.1.1.1 2003/02/12 13:59:15 matteo
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mer feb 12 14:56:57 CET 2003
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Revision 1.2 2000/01/05 08:20:39 markster
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Some OSS fixes and a few lpc changes to make it actually work
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* Revision 1.1 1996/08/19 22:31:56 jaf
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* Initial revision
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*
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*/
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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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#ifdef P_R_O_T_O_T_Y_P_E_S
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extern int irc2pc_(real *rc, real *pc, integer *order, real *gprime, real *g2pass);
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#endif
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/* ***************************************************************** */
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/* IRC2PC Version 48 */
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/* $Log$
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* Revision 1.15 2004/06/26 03:50:14 markster
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* Merge source cleanups (bug #1911)
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*
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* Revision 1.14 2003/02/12 13:59:15 matteo
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* mer feb 12 14:56:57 CET 2003
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*
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* Revision 1.1.1.1 2003/02/12 13:59:15 matteo
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* mer feb 12 14:56:57 CET 2003
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*
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* Revision 1.2 2000/01/05 08:20:39 markster
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* Some OSS fixes and a few lpc changes to make it actually work
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*
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* Revision 1.1 1996/08/19 22:31:56 jaf
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* Initial revision
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* */
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/* Revision 1.3 1996/03/20 15:47:19 jaf */
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/* Added comments about which indices of array arguments are read or */
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/* written. */
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/* Revision 1.2 1996/03/14 16:59:04 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 14:47:27 jaf */
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/* Initial revision */
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/* ***************************************************************** */
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/* Convert Reflection Coefficients to Predictor Coeficients */
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/* Inputs: */
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/* RC - Reflection coefficients */
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/* Indices 1 through ORDER read. */
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/* ORDER - Number of RC's */
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/* GPRIME - Excitation modification gain */
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/* Outputs: */
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/* PC - Predictor coefficients */
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/* Indices 1 through ORDER written. */
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/* Indices 1 through ORDER-1 are read after being written. */
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/* G2PASS - Excitation modification sharpening factor */
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/* This subroutine has no local state. */
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/* Subroutine */ int irc2pc_(real *rc, real *pc, integer *order, real *gprime,
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real *g2pass)
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{
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/* System generated locals */
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integer i__1, i__2;
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/* Builtin functions */
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double sqrt(doublereal);
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/* Local variables */
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real temp[10];
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integer i__, j;
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/* Arguments */
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/* $Log$
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* Revision 1.15 2004/06/26 03:50:14 markster
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* Merge source cleanups (bug #1911)
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*
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* Revision 1.14 2003/02/12 13:59:15 matteo
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* mer feb 12 14:56:57 CET 2003
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*
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* Revision 1.1.1.1 2003/02/12 13:59:15 matteo
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* mer feb 12 14:56:57 CET 2003
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*
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* Revision 1.2 2000/01/05 08:20:39 markster
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* Some OSS fixes and a few lpc changes to make it actually work
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*
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* Revision 1.1 1996/08/19 22:31:56 jaf
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* Initial revision
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* */
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/* Revision 1.3 1996/03/29 22:03:47 jaf */
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/* Removed definitions for any constants that were no longer used. */
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/* Revision 1.2 1996/03/26 19:34:33 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 14:43:51 jaf */
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/* Initial revision */
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/* LPC Configuration parameters: */
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/* Frame size, Prediction order, Pitch period */
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/* Local variables that need not be saved */
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/* Parameter adjustments */
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--pc;
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--rc;
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/* Function Body */
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*g2pass = 1.f;
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i__1 = *order;
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for (i__ = 1; i__ <= i__1; ++i__) {
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*g2pass *= 1.f - rc[i__] * rc[i__];
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}
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*g2pass = *gprime * (real)sqrt(*g2pass);
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pc[1] = rc[1];
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i__1 = *order;
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for (i__ = 2; i__ <= i__1; ++i__) {
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i__2 = i__ - 1;
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for (j = 1; j <= i__2; ++j) {
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temp[j - 1] = pc[j] - rc[i__] * pc[i__ - j];
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}
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i__2 = i__ - 1;
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for (j = 1; j <= i__2; ++j) {
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pc[j] = temp[j - 1];
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}
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pc[i__] = rc[i__];
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}
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return 0;
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} /* irc2pc_ */
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