lsp.h

/*---------------------------------------------------------------------------*\
Original Copyright
        FILE........: AK2LSPD.H
        TYPE........: Turbo C header file
        COMPANY.....: Voicetronix
        AUTHOR......: James Whitehall
        DATE CREATED: 21/11/95

Modified by Jean-Marc Valin

    This file contains functions for converting Linear Prediction
    Coefficients (LPC) to Line Spectral Pair (LSP) and back. Note that the
    LSP coefficients are not in radians format but in the x domain of the
    unit circle.

\*---------------------------------------------------------------------------*/
/* Speex License:

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.
   
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.
   
   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef __AK2LSPD__
#define __AK2LSPD__

#ifdef __cplusplus
extern "C" {
#endif

int lpc_to_lsp (float *a, int lpcrdr, float *freq, int nb, float delta, float *stack);
void lsp_to_lpc(float *freq, float *ak, int lpcrdr, float *stack);

/*Added by JMV*/
void lsp_enforce_margin(float *lsp, int len, float margin);

#ifdef __cplusplus
}
#endif

#endif  /* __AK2LSPD__ */

---