155 lines
4.1 KiB
C
155 lines
4.1 KiB
C
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/*
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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 20:23:46 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 22:32:34 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 deemp_(real *x, integer *n, struct lpc10_decoder_state *st);
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#endif
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/* ***************************************************************** */
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/* DEEMP 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 13:59:14 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 20:23:46 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 22:32:34 jaf
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* Initial revision
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* */
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/* Revision 1.3 1996/03/20 15:54:37 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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/* Added entry INITDEEMP to reinitialize the local state variables, if */
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/* desired. */
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/* Revision 1.2 1996/03/14 22:11:13 jaf */
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/* Comments added explaining which of the local variables of this */
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/* subroutine need to be saved from one invocation to the next, and which */
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/* do not. */
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/* Revision 1.1 1996/02/07 14:44:53 jaf */
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/* Initial revision */
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/* ***************************************************************** */
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/* De-Emphasize output speech with 1 / ( 1 - .75z**-1 ) */
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/* cascaded with 200 Hz high pass filter */
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/* ( 1 - 1.9998z**-1 + z**-2 ) / ( 1 - 1.75z**-1 + .78z**-2 ) */
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/* WARNING! The coefficients above may be out of date with the code */
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/* below. Either that, or some kind of transformation was performed */
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/* on the coefficients above to create the code below. */
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/* Input: */
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/* N - Number of samples */
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/* Input/Output: */
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/* X - Speech */
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/* Indices 1 through N are read before being 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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/* INITDEEMP. */
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/* Subroutine */ int deemp_(real *x, integer *n, struct lpc10_decoder_state *st)
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{
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/* Initialized data */
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real *dei1;
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real *dei2;
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real *deo1;
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real *deo2;
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real *deo3;
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/* System generated locals */
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integer i__1;
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real r__1;
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/* Local variables */
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integer k;
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real dei0;
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/* Arguments */
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/* Local variables that need not be saved */
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/* Local state */
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/* All of the locals saved below were not given explicit initial */
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/* values in the original code. I think 0 is a safe choice. */
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/* Parameter adjustments */
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if (x) {
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--x;
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}
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/* Function Body */
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dei1 = &(st->dei1);
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dei2 = &(st->dei2);
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deo1 = &(st->deo1);
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deo2 = &(st->deo2);
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deo3 = &(st->deo3);
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i__1 = *n;
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for (k = 1; k <= i__1; ++k) {
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dei0 = x[k];
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r__1 = x[k] - *dei1 * 1.9998f + *dei2;
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x[k] = r__1 + *deo1 * 2.5f - *deo2 * 2.0925f + *deo3 * .585f;
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*dei2 = *dei1;
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*dei1 = dei0;
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*deo3 = *deo2;
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*deo2 = *deo1;
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*deo1 = x[k];
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}
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return 0;
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} /* deemp_ */
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