448 lines
14 KiB
C
448 lines
14 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 13:59:14 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 13:59:14 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 1.2 1996/08/20 20:18:55 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_decoder_state that is passed as an
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* argument.
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*
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* Removed init function, since all initialization is now done in
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* init_lpc10_decoder_state().
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*
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* Revision 1.1 1996/08/19 22:32:58 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 bsynz_(real *coef, integer *ip, integer *iv, real *sout, real *rms, real *ratio, real *g2pass, struct lpc10_decoder_state *st);
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/* comlen contrl_ 12 */
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/*:ref: random_ 4 0 */
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#endif
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/* Common Block Declarations */
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extern struct {
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integer order, lframe;
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logical corrp;
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} contrl_;
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#define contrl_1 contrl_
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/* ***************************************************************** */
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/* BSYNZ Version 54 */
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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 13:59:14 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 13:59:14 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 1.2 1996/08/20 20:18:55 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_decoder_state that is passed as an
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* argument.
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*
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* Removed init function, since all initialization is now done in
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* init_lpc10_decoder_state().
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*
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* Revision 1.1 1996/08/19 22:32:58 jaf
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* Initial revision
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* */
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/* Revision 1.4 1996/03/27 18:11:22 jaf */
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/* Changed the range of NOISE printed out in the debugging statements, */
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/* even though they are commented out. I didn't discover this until I */
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/* tried comparing two different versions of the LPC-10 coder, each with */
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/* full tracing enabled. */
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/* Revision 1.3 1996/03/26 19:33:23 jaf */
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/* Commented out trace statements. */
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/* Revision 1.2 1996/03/20 17:12:54 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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/* Rearranged local variable declarations to indicate which need to be */
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/* saved from one invocation to the next. Added entry INITBSYNZ to */
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/* reinitialize the local state variables, if desired. */
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/* Revision 1.1 1996/02/07 14:43:15 jaf */
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/* Initial revision */
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/* ***************************************************************** */
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/* Synthesize One Pitch Epoch */
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/* Input: */
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/* COEF - Predictor coefficients */
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/* Indices 1 through ORDER read. */
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/* IP - Pitch period (number of samples to synthesize) */
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/* IV - Voicing for the current epoch */
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/* RMS - Energy for the current epoch */
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/* RATIO - Energy slope for plosives */
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/* G2PASS- Sharpening factor for 2 pass synthesis */
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/* Output: */
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/* SOUT - Synthesized speech */
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/* Indices 1 through IP written. */
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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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/* INITBSYNZ. */
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/* Subroutine */ int bsynz_(real *coef, integer *ip, integer *iv,
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real *sout, real *rms, real *ratio, real *g2pass,
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struct lpc10_decoder_state *st)
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{
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/* Initialized data */
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integer *ipo;
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real *rmso;
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static integer kexc[25] = { 8,-16,26,-48,86,-162,294,-502,718,-728,184,
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672,-610,-672,184,728,718,502,294,162,86,48,26,16,8 };
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real *exc;
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real *exc2;
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real *lpi1;
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real *lpi2;
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real *lpi3;
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real *hpi1;
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real *hpi2;
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real *hpi3;
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/* System generated locals */
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integer i__1, i__2;
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real r__1, r__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 gain, xssq;
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integer i__, j, k;
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real noise[166], pulse;
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integer px;
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real sscale;
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extern integer random_(struct lpc10_decoder_state *);
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real xy, sum, ssq;
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real lpi0, hpi0;
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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 13:59:14 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 13:59:14 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 1.2 1996/08/20 20:18:55 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_decoder_state that is passed as an
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* argument.
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*
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* Removed init function, since all initialization is now done in
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* init_lpc10_decoder_state().
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*
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* Revision 1.1 1996/08/19 22:32:58 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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/* 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 13:59:14 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 13:59:14 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 1.2 1996/08/20 20:18:55 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_decoder_state that is passed as an
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* argument.
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*
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* Removed init function, since all initialization is now done in
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* init_lpc10_decoder_state().
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*
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* Revision 1.1 1996/08/19 22:32:58 jaf
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* Initial revision
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* */
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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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*/
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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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*/
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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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*/
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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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*/
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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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*/
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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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*/
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/* Current frame, Unstable frames, Output clip count, Max onset buffer,
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*/
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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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*/
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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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*/
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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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*/
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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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/* embedded. */
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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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/* Function return value definitions */
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/* Parameters/constants */
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/* KEXC is not a Fortran PARAMETER, but it is an array initialized
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*/
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/* with a DATA statement that is never modified. */
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/* Local variables that need not be saved */
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/* NOISE is declared with range (1:MAXPIT+MAXORD), but only indices
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*/
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/* ORDER+1 through ORDER+IP are ever used, and I think that IP */
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/* .LE. MAXPIT. Why not declare it to be in the range (1:MAXPIT) */
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/* and use that range? */
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/* Local state */
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/* I believe that only indices 1 through ORDER of EXC need to be */
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/* saved from one invocation to the next, but we may as well save */
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/* the whole array. */
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/* None of these local variables were given initial values in the */
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/* original code. I'm guessing that 0 is a reasonable initial */
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/* value for all of them. */
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/* Parameter adjustments */
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if (coef) {
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--coef;
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}
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if (sout) {
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--sout;
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}
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/* Function Body */
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ipo = &(st->ipo);
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exc = &(st->exc[0]);
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exc2 = &(st->exc2[0]);
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lpi1 = &(st->lpi1);
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lpi2 = &(st->lpi2);
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lpi3 = &(st->lpi3);
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hpi1 = &(st->hpi1);
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hpi2 = &(st->hpi2);
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hpi3 = &(st->hpi3);
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rmso = &(st->rmso_bsynz);
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/* MAXPIT+MAXORD=166 */
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/* Calculate history scale factor XY and scale filter state */
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/* Computing MIN */
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r__1 = *rmso / (*rms + 1e-6f);
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xy = min(r__1,8.f);
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*rmso = *rms;
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i__1 = contrl_1.order;
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for (i__ = 1; i__ <= i__1; ++i__) {
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exc2[i__ - 1] = exc2[*ipo + i__ - 1] * xy;
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}
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*ipo = *ip;
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if (*iv == 0) {
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/* Generate white noise for unvoiced */
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i__1 = *ip;
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for (i__ = 1; i__ <= i__1; ++i__) {
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exc[contrl_1.order + i__ - 1] = (real) (random_(st) / 64);
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}
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/* Impulse doublet excitation for plosives */
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/* (RANDOM()+32768) is in the range 0 to 2**16-1. Therefore the
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*/
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/* following expression should be evaluated using integers with
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at */
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/* least 32 bits (16 isn't enough), and PX should be in the rang
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e */
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/* ORDER+1+0 through ORDER+1+(IP-2) .EQ. ORDER+IP-1. */
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px = (random_(st) + 32768) * (*ip - 1) / 65536 + contrl_1.order + 1;
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r__1 = *ratio / 4 * 1.f;
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pulse = r__1 * 342;
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if (pulse > 2e3f) {
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pulse = 2e3f;
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}
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exc[px - 1] += pulse;
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exc[px] -= pulse;
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/* Load voiced excitation */
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} else {
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sscale = (real)sqrt((real) (*ip)) / 6.928f;
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i__1 = *ip;
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for (i__ = 1; i__ <= i__1; ++i__) {
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exc[contrl_1.order + i__ - 1] = 0.f;
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if (i__ <= 25) {
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exc[contrl_1.order + i__ - 1] = sscale * kexc[i__ - 1];
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}
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lpi0 = exc[contrl_1.order + i__ - 1];
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r__2 = exc[contrl_1.order + i__ - 1] * .125f + *lpi1 * .75f;
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r__1 = r__2 + *lpi2 * .125f;
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exc[contrl_1.order + i__ - 1] = r__1 + *lpi3 * 0.f;
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*lpi3 = *lpi2;
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*lpi2 = *lpi1;
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*lpi1 = lpi0;
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}
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i__1 = *ip;
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for (i__ = 1; i__ <= i__1; ++i__) {
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noise[contrl_1.order + i__ - 1] = random_(st) * 1.f / 64;
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hpi0 = noise[contrl_1.order + i__ - 1];
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r__2 = noise[contrl_1.order + i__ - 1] * -.125f + *hpi1 * .25f;
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r__1 = r__2 + *hpi2 * -.125f;
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noise[contrl_1.order + i__ - 1] = r__1 + *hpi3 * 0.f;
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*hpi3 = *hpi2;
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*hpi2 = *hpi1;
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*hpi1 = hpi0;
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}
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i__1 = *ip;
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for (i__ = 1; i__ <= i__1; ++i__) {
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exc[contrl_1.order + i__ - 1] += noise[contrl_1.order + i__ - 1];
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}
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}
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/* Synthesis filters: */
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/* Modify the excitation with all-zero filter 1 + G*SUM */
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xssq = 0.f;
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i__1 = *ip;
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for (i__ = 1; i__ <= i__1; ++i__) {
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k = contrl_1.order + i__;
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sum = 0.f;
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i__2 = contrl_1.order;
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for (j = 1; j <= i__2; ++j) {
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sum += coef[j] * exc[k - j - 1];
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}
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sum *= *g2pass;
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exc2[k - 1] = sum + exc[k - 1];
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}
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/* Synthesize using the all pole filter 1 / (1 - SUM) */
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i__1 = *ip;
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for (i__ = 1; i__ <= i__1; ++i__) {
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k = contrl_1.order + i__;
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sum = 0.f;
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i__2 = contrl_1.order;
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for (j = 1; j <= i__2; ++j) {
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sum += coef[j] * exc2[k - j - 1];
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}
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exc2[k - 1] = sum + exc2[k - 1];
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xssq += exc2[k - 1] * exc2[k - 1];
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}
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/* Save filter history for next epoch */
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i__1 = contrl_1.order;
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for (i__ = 1; i__ <= i__1; ++i__) {
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exc[i__ - 1] = exc[*ip + i__ - 1];
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exc2[i__ - 1] = exc2[*ip + i__ - 1];
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}
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/* Apply gain to match RMS */
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r__1 = *rms * *rms;
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ssq = r__1 * *ip;
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gain = (real)sqrt(ssq / xssq);
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i__1 = *ip;
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for (i__ = 1; i__ <= i__1; ++i__) {
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sout[i__] = gain * exc2[contrl_1.order + i__ - 1];
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}
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return 0;
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} /* bsynz_ */
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