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LP2LSPConversion.h
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LP2LSPConversion.h
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/*
LP2LSPConversion.h
Copyright (C) 2011 Belledonne Communications, Grenoble, France
Author : Johan Pascal
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef LP2LSPCONVERSION_H
#define LP2LSPCONVERSION_H
/*****************************************************************************/
/* LP2LSPConversion : Compute polynomials, find their roots as in spec A3.2.3*/
/* parameters: */
/* -(i) LPCoefficients[] : 10 coefficients in Q12 */
/* -(o) LSPCoefficients[] : 10 coefficients in Q15 */
/* */
/* return value : */
/* - boolean: 1 if all roots found, 0 if unable to compute 10 roots */
/* */
/*****************************************************************************/
int LP2LSPConversion(word16_t LPCoefficients[], word16_t LSPCoefficients[]);
//static const word16_t cosW0pi[NB_COMPUTED_VALUES_CHEBYSHEV_POLYNOMIAL]; /* cos(w) from 0 to Pi in 50 steps */
#endif /* ifndef LP2LSPCONVERSION_H */