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Diffstat (limited to 'trunk/codecs/lpc10/irc2pc.c')
| -rw-r--r-- | trunk/codecs/lpc10/irc2pc.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/trunk/codecs/lpc10/irc2pc.c b/trunk/codecs/lpc10/irc2pc.c new file mode 100644 index 000000000..b96ff0d66 --- /dev/null +++ b/trunk/codecs/lpc10/irc2pc.c @@ -0,0 +1,151 @@ +/* + +$Log$ +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 1.1 1996/08/19 22:31:56 jaf + * Initial revision + * + +*/ + +/* -- translated by f2c (version 19951025). + You must link the resulting object file with the libraries: + -lf2c -lm (in that order) +*/ + +#include "f2c.h" + +#ifdef P_R_O_T_O_T_Y_P_E_S +extern int irc2pc_(real *rc, real *pc, integer *order, real *gprime, real *g2pass); +#endif + +/* ***************************************************************** */ + +/* IRC2PC Version 48 */ + +/* $Log$ + * 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 1.1 1996/08/19 22:31:56 jaf + * Initial revision + * */ +/* Revision 1.3 1996/03/20 15:47:19 jaf */ +/* Added comments about which indices of array arguments are read or */ +/* written. */ + +/* Revision 1.2 1996/03/14 16:59:04 jaf */ +/* Comments added explaining that none of the local variables of this */ +/* subroutine need to be saved from one invocation to the next. */ + +/* Revision 1.1 1996/02/07 14:47:27 jaf */ +/* Initial revision */ + + +/* ***************************************************************** */ + +/* Convert Reflection Coefficients to Predictor Coeficients */ + +/* Inputs: */ +/* RC - Reflection coefficients */ +/* Indices 1 through ORDER read. */ +/* ORDER - Number of RC's */ +/* GPRIME - Excitation modification gain */ +/* Outputs: */ +/* PC - Predictor coefficients */ +/* Indices 1 through ORDER written. */ +/* Indices 1 through ORDER-1 are read after being written. */ +/* G2PASS - Excitation modification sharpening factor */ + +/* This subroutine has no local state. */ + +/* Subroutine */ int irc2pc_(real *rc, real *pc, integer *order, real *gprime, + real *g2pass) +{ + /* System generated locals */ + integer i__1, i__2; + + /* Builtin functions */ + double sqrt(doublereal); + + /* Local variables */ + real temp[10]; + integer i__, j; + +/* 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 1.1 1996/08/19 22:31:56 jaf + * Initial revision + * */ +/* Revision 1.3 1996/03/29 22:03:47 jaf */ +/* Removed definitions for any constants that were no longer used. */ + +/* Revision 1.2 1996/03/26 19:34:33 jaf */ +/* Added comments indicating which constants are not needed in an */ +/* application that uses the LPC-10 coder. */ + +/* Revision 1.1 1996/02/07 14:43:51 jaf */ +/* Initial revision */ + +/* LPC Configuration parameters: */ +/* Frame size, Prediction order, Pitch period */ +/* Local variables that need not be saved */ + /* Parameter adjustments */ + --pc; + --rc; + + /* Function Body */ + *g2pass = 1.f; + i__1 = *order; + for (i__ = 1; i__ <= i__1; ++i__) { + *g2pass *= 1.f - rc[i__] * rc[i__]; + } + *g2pass = *gprime * (real)sqrt(*g2pass); + pc[1] = rc[1]; + i__1 = *order; + for (i__ = 2; i__ <= i__1; ++i__) { + i__2 = i__ - 1; + for (j = 1; j <= i__2; ++j) { + temp[j - 1] = pc[j] - rc[i__] * pc[i__ - j]; + } + i__2 = i__ - 1; + for (j = 1; j <= i__2; ++j) { + pc[j] = temp[j - 1]; + } + pc[i__] = rc[i__]; + } + return 0; +} /* irc2pc_ */ + |