| /*---------------------------------------------------------------------------*\ |
| 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. |
| |
| \*---------------------------------------------------------------------------*/ |
| /** |
| @file lsp.h |
| @brief Line Spectral Pair (LSP) functions. |
| */ |
| /* Speex License: |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| |
| - Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| |
| - Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| |
| - Neither the name of the Xiph.org Foundation nor the names of its |
| contributors may be used to endorse or promote products derived from |
| this software without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR |
| CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef __AK2LSPD__ |
| #define __AK2LSPD__ |
| |
| #include "arch.h" |
| |
| int lpc_to_lsp (spx_coef_t *a, int lpcrdr, spx_lsp_t *freq, int nb, spx_word16_t delta, char *stack); |
| void lsp_to_lpc(spx_lsp_t *freq, spx_coef_t *ak, int lpcrdr, char *stack); |
| |
| /*Added by JMV*/ |
| void lsp_enforce_margin(spx_lsp_t *lsp, int len, spx_word16_t margin); |
| |
| void lsp_interpolate(spx_lsp_t *old_lsp, spx_lsp_t *new_lsp, spx_lsp_t *interp_lsp, int len, int subframe, int nb_subframes); |
| |
| #endif /* __AK2LSPD__ */ |