?? phi_lsfr.h
字號:
/*====================================================================*/
/* MPEG-4 Audio (ISO/IEC 14496-3) Copyright Header */
/*====================================================================*/
/*
This software module was originally developed by P. Kabal, McGill University,
in the course of development of the MPEG-4 Audio (ISO/IEC 14496-3). This
software module is an implementation of a part of one or more MPEG-4
Audio (ISO/IEC 14496-3) tools as specified by the MPEG-4 Audio
(ISO/IEC 14496-3). ISO/IEC gives users of the MPEG-4 Audio (ISO/IEC
14496-3) free license to this software module or modifications thereof
for use in hardware or software products claiming conformance to the
MPEG-4 Audio (ISO/IEC 14496-3). Those intending to use this software
module in hardware or software products are advised that its use may
infringe existing patents. The original developer of this software
module and his/her company, the subsequent editors and their
companies, and ISO/IEC have no liability for use of this software
module or modifications thereof in an implementation. Copyright is not
released for non MPEG-4 Audio (ISO/IEC 14496-3) conforming products.
CN1 retains full right to use the code for his/her own purpose, assign
or donate the code to a third party and to inhibit third parties from
using the code for non MPEG-4 Audio (ISO/IEC 14496-3) conforming
products. This copyright notice must be included in all copies or
derivative works. Copyright 1996.
*/
/*====================================================================*/
/*======================================================================*/
/* */
/* INCLUDE_FILE: PHI_LSFR.H */
/* */
/*======================================================================*/
#ifndef _phi_lsfr_h_
#define _phi_lsfr_h_
#ifdef __cplusplus
extern "C" {
#endif
void PHI_lsf2pc
(
long order, /* input : predictor order */
const float lsf[], /* input : line-spectral freqs [0,pi] */
float pc[] /* output: predictor coeff: a_1,a_2...a_order */
);
void PHI_pc2lsf( /* ret 1 on succ, 0 on failure */
long np, /* input : order = # of freq to cal. */
const float pc[], /* input : the np predictor coeff. */
float lsf[] /* output: the np line spectral freq. */
);
#ifdef __cplusplus
}
#endif
#endif /* #ifndef _phi_lsfr_h_ */
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