mirror of
https://github.com/asterisk/asterisk.git
synced 2025-11-04 05:15:22 +00:00
8a9517ba9a
git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@45079 65c4cc65-6c06-0410-ace0-fbb531ad65f3
170 lines
4.6 KiB
C
170 lines
4.6 KiB
C
/*
|
|
|
|
$Log$
|
|
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 1.2 1996/08/20 20:28:05 jaf
|
|
* Removed all static local variables that were SAVE'd in the Fortran
|
|
* code, and put them in struct lpc10_encoder_state that is passed as an
|
|
* argument.
|
|
*
|
|
* Removed init function, since all initialization is now done in
|
|
* init_lpc10_encoder_state().
|
|
*
|
|
* Revision 1.1 1996/08/19 22:32:04 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 hp100_(real *speech, integer *start, integer *end,
|
|
struct lpc10_encoder_state *st);
|
|
extern int inithp100_(void);
|
|
#endif
|
|
|
|
/* ********************************************************************* */
|
|
|
|
/* HP100 Version 55 */
|
|
|
|
/* $Log$
|
|
* 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 1.2 1996/08/20 20:28:05 jaf
|
|
* Removed all static local variables that were SAVE'd in the Fortran
|
|
* code, and put them in struct lpc10_encoder_state that is passed as an
|
|
* argument.
|
|
*
|
|
* Removed init function, since all initialization is now done in
|
|
* init_lpc10_encoder_state().
|
|
*
|
|
* Revision 1.1 1996/08/19 22:32:04 jaf
|
|
* Initial revision
|
|
* */
|
|
/* Revision 1.6 1996/03/15 16:45:25 jaf */
|
|
/* Rearranged a few comments. */
|
|
|
|
/* Revision 1.5 1996/03/14 23:20:54 jaf */
|
|
/* Added comments about when INITHP100 should be used. */
|
|
|
|
/* Revision 1.4 1996/03/14 23:08:08 jaf */
|
|
/* Added an entry named INITHP100 that initializes the local state of */
|
|
/* subroutine HP100. */
|
|
|
|
/* Revision 1.3 1996/03/14 22:09:20 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 1.2 1996/02/12 15:05:54 jaf */
|
|
/* Added lots of comments explaining why I changed one line, which was a */
|
|
/* declaration with initializations. */
|
|
|
|
/* Revision 1.1 1996/02/07 14:47:12 jaf */
|
|
/* Initial revision */
|
|
|
|
|
|
/* ********************************************************************* */
|
|
|
|
/* 100 Hz High Pass Filter */
|
|
|
|
/* Jan 92 - corrected typo (1.937148 to 1.935715), */
|
|
/* rounded coefficients to 7 places, */
|
|
/* corrected and merged gain (.97466**4), */
|
|
/* merged numerator into first two sections. */
|
|
|
|
/* Input: */
|
|
/* start, end - Range of samples to filter */
|
|
/* Input/Output: */
|
|
/* speech(end) - Speech data. */
|
|
/* Indices start through end are read and modified. */
|
|
|
|
/* 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 */
|
|
/* INITHP100. */
|
|
/* Subroutine */ int hp100_(real *speech, integer *start, integer *end,
|
|
struct lpc10_encoder_state *st)
|
|
{
|
|
/* Temporary local copies of variables in lpc10_encoder_state.
|
|
I've only created these because it might cause the loop below
|
|
to execute a bit faster to access local variables, rather than
|
|
variables in the lpc10_encoder_state structure. It is just a
|
|
guess that it will be faster. */
|
|
|
|
real z11;
|
|
real z21;
|
|
real z12;
|
|
real z22;
|
|
|
|
/* System generated locals */
|
|
integer i__1;
|
|
|
|
/* Local variables */
|
|
integer i__;
|
|
real si, err;
|
|
|
|
/* Arguments */
|
|
/* Local variables that need not be saved */
|
|
/* Local state */
|
|
/* Parameter adjustments */
|
|
if (speech) {
|
|
--speech;
|
|
}
|
|
|
|
/* Function Body */
|
|
|
|
z11 = st->z11;
|
|
z21 = st->z21;
|
|
z12 = st->z12;
|
|
z22 = st->z22;
|
|
|
|
i__1 = *end;
|
|
for (i__ = *start; i__ <= i__1; ++i__) {
|
|
si = speech[i__];
|
|
err = si + z11 * 1.859076f - z21 * .8648249f;
|
|
si = err - z11 * 2.f + z21;
|
|
z21 = z11;
|
|
z11 = err;
|
|
err = si + z12 * 1.935715f - z22 * .9417004f;
|
|
si = err - z12 * 2.f + z22;
|
|
z22 = z12;
|
|
z12 = err;
|
|
speech[i__] = si * .902428f;
|
|
}
|
|
|
|
st->z11 = z11;
|
|
st->z21 = z21;
|
|
st->z12 = z12;
|
|
st->z22 = z22;
|
|
|
|
return 0;
|
|
} /* hp100_ */
|