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58 lines
2.4 KiB
58 lines
2.4 KiB
5 years ago
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/*---------------------------------------------------------------------------*\
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Original Copyright
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FILE........: AK2LSPD.H
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TYPE........: Turbo C header file
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COMPANY.....: Voicetronix
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AUTHOR......: James Whitehall
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DATE CREATED: 21/11/95
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Modified by Jean-Marc Valin
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This file contains functions for converting Linear Prediction
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Coefficients (LPC) to Line Spectral Pair (LSP) and back. Note that the
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LSP coefficients are not in radians format but in the x domain of the
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unit circle.
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\*---------------------------------------------------------------------------*/
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/* Speex License:
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __AK2LSPD__
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#define __AK2LSPD__
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int lpc_to_lsp (float *a, int lpcrdr, float *freq, int nb, float delta, char *stack);
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void lsp_to_lpc(float *freq, float *ak, int lpcrdr, char *stack);
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/*Added by JMV*/
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void lsp_enforce_margin(float *lsp, int len, float margin);
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#endif /* __AK2LSPD__ */
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