git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3311 65c4cc65-6c06-0410-ace0-fbb531ad65f3
155 lines
4.1 KiB
C
Executable file
155 lines
4.1 KiB
C
Executable file
/*
|
|
|
|
$Log$
|
|
Revision 1.15 2004/06/26 03:50:14 markster
|
|
Merge source cleanups (bug #1911)
|
|
|
|
Revision 1.14 2003/02/12 13:59:14 matteo
|
|
mer feb 12 14:56:57 CET 2003
|
|
|
|
Revision 1.1.1.1 2003/02/12 13:59:14 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 1.2 1996/08/20 20:23:46 jaf
|
|
* Removed all static local variables that were SAVE'd in the Fortran
|
|
* code, and put them in struct lpc10_decoder_state that is passed as an
|
|
* argument.
|
|
*
|
|
* Removed init function, since all initialization is now done in
|
|
* init_lpc10_decoder_state().
|
|
*
|
|
* Revision 1.1 1996/08/19 22:32:34 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 deemp_(real *x, integer *n, struct lpc10_decoder_state *st);
|
|
#endif
|
|
|
|
/* ***************************************************************** */
|
|
|
|
/* DEEMP Version 48 */
|
|
|
|
/* $Log$
|
|
* Revision 1.15 2004/06/26 03:50:14 markster
|
|
* Merge source cleanups (bug #1911)
|
|
*
|
|
/* Revision 1.14 2003/02/12 13:59:14 matteo
|
|
/* mer feb 12 14:56:57 CET 2003
|
|
/*
|
|
/* Revision 1.1.1.1 2003/02/12 13:59:14 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 1.2 1996/08/20 20:23:46 jaf
|
|
* Removed all static local variables that were SAVE'd in the Fortran
|
|
* code, and put them in struct lpc10_decoder_state that is passed as an
|
|
* argument.
|
|
*
|
|
* Removed init function, since all initialization is now done in
|
|
* init_lpc10_decoder_state().
|
|
*
|
|
* Revision 1.1 1996/08/19 22:32:34 jaf
|
|
* Initial revision
|
|
* */
|
|
/* Revision 1.3 1996/03/20 15:54:37 jaf */
|
|
/* Added comments about which indices of array arguments are read or */
|
|
/* written. */
|
|
|
|
/* Added entry INITDEEMP to reinitialize the local state variables, if */
|
|
/* desired. */
|
|
|
|
/* Revision 1.2 1996/03/14 22:11:13 jaf */
|
|
/* Comments added explaining which of the local variables of this */
|
|
/* subroutine need to be saved from one invocation to the next, and which */
|
|
/* do not. */
|
|
|
|
/* Revision 1.1 1996/02/07 14:44:53 jaf */
|
|
/* Initial revision */
|
|
|
|
|
|
/* ***************************************************************** */
|
|
|
|
/* De-Emphasize output speech with 1 / ( 1 - .75z**-1 ) */
|
|
/* cascaded with 200 Hz high pass filter */
|
|
/* ( 1 - 1.9998z**-1 + z**-2 ) / ( 1 - 1.75z**-1 + .78z**-2 ) */
|
|
|
|
/* WARNING! The coefficients above may be out of date with the code */
|
|
/* below. Either that, or some kind of transformation was performed */
|
|
/* on the coefficients above to create the code below. */
|
|
|
|
/* Input: */
|
|
/* N - Number of samples */
|
|
/* Input/Output: */
|
|
/* X - Speech */
|
|
/* Indices 1 through N are read before being written. */
|
|
|
|
/* This subroutine maintains local state from one call to the next. If */
|
|
/* you want to switch to using a new audio stream for this filter, or */
|
|
/* reinitialize its state for any other reason, call the ENTRY */
|
|
/* INITDEEMP. */
|
|
|
|
/* Subroutine */ int deemp_(real *x, integer *n, struct lpc10_decoder_state *st)
|
|
{
|
|
/* Initialized data */
|
|
|
|
real *dei1;
|
|
real *dei2;
|
|
real *deo1;
|
|
real *deo2;
|
|
real *deo3;
|
|
|
|
/* System generated locals */
|
|
integer i__1;
|
|
real r__1;
|
|
|
|
/* Local variables */
|
|
integer k;
|
|
real dei0;
|
|
|
|
/* Arguments */
|
|
/* Local variables that need not be saved */
|
|
/* Local state */
|
|
/* All of the locals saved below were not given explicit initial */
|
|
/* values in the original code. I think 0 is a safe choice. */
|
|
/* Parameter adjustments */
|
|
if (x) {
|
|
--x;
|
|
}
|
|
|
|
/* Function Body */
|
|
|
|
dei1 = &(st->dei1);
|
|
dei2 = &(st->dei2);
|
|
deo1 = &(st->deo1);
|
|
deo2 = &(st->deo2);
|
|
deo3 = &(st->deo3);
|
|
|
|
i__1 = *n;
|
|
for (k = 1; k <= i__1; ++k) {
|
|
dei0 = x[k];
|
|
r__1 = x[k] - *dei1 * 1.9998f + *dei2;
|
|
x[k] = r__1 + *deo1 * 2.5f - *deo2 * 2.0925f + *deo3 * .585f;
|
|
*dei2 = *dei1;
|
|
*dei1 = dei0;
|
|
*deo3 = *deo2;
|
|
*deo2 = *deo1;
|
|
*deo1 = x[k];
|
|
}
|
|
return 0;
|
|
} /* deemp_ */
|