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| 1 /*---------------------------------------------------------------------------*\ |
| 2 Original Copyright |
| 3 FILE........: AK2LSPD.H |
| 4 TYPE........: Turbo C header file |
| 5 COMPANY.....: Voicetronix |
| 6 AUTHOR......: James Whitehall |
| 7 DATE CREATED: 21/11/95 |
| 8 |
| 9 Modified by Jean-Marc Valin |
| 10 |
| 11 This file contains functions for converting Linear Prediction |
| 12 Coefficients (LPC) to Line Spectral Pair (LSP) and back. Note that the |
| 13 LSP coefficients are not in radians format but in the x domain of the |
| 14 unit circle. |
| 15 |
| 16 \*---------------------------------------------------------------------------*/ |
| 17 /** |
| 18 @file lsp.h |
| 19 @brief Line Spectral Pair (LSP) functions. |
| 20 */ |
| 21 /* Speex License: |
| 22 |
| 23 Redistribution and use in source and binary forms, with or without |
| 24 modification, are permitted provided that the following conditions |
| 25 are met: |
| 26 |
| 27 - Redistributions of source code must retain the above copyright |
| 28 notice, this list of conditions and the following disclaimer. |
| 29 |
| 30 - Redistributions in binary form must reproduce the above copyright |
| 31 notice, this list of conditions and the following disclaimer in the |
| 32 documentation and/or other materials provided with the distribution. |
| 33 |
| 34 - Neither the name of the Xiph.org Foundation nor the names of its |
| 35 contributors may be used to endorse or promote products derived from |
| 36 this software without specific prior written permission. |
| 37 |
| 38 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 39 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 40 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 41 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR |
| 42 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 43 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 44 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 45 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 46 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 47 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 48 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 49 */ |
| 50 |
| 51 #ifndef __AK2LSPD__ |
| 52 #define __AK2LSPD__ |
| 53 |
| 54 #include "arch.h" |
| 55 |
| 56 int lpc_to_lsp (spx_coef_t *a, int lpcrdr, spx_lsp_t *freq, int nb, spx_word16_t
delta, char *stack); |
| 57 void lsp_to_lpc(spx_lsp_t *freq, spx_coef_t *ak, int lpcrdr, char *stack); |
| 58 |
| 59 /*Added by JMV*/ |
| 60 void lsp_enforce_margin(spx_lsp_t *lsp, int len, spx_word16_t margin); |
| 61 |
| 62 void lsp_interpolate(spx_lsp_t *old_lsp, spx_lsp_t *new_lsp, spx_lsp_t *interp_l
sp, int len, int subframe, int nb_subframes); |
| 63 |
| 64 #endif /* __AK2LSPD__ */ |
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