/*This software module was originally developed byPeter Kroon (Bell Laboratories, Lucent Technologies)in the course of development of the MPEG-2 NBC/MPEG-4 Audio standardISO/IEC 13818-7, 14496-1,2 and 3. This software module is animplementation of a part of one or more MPEG-2 NBC/MPEG-4 Audio toolsas specified by the MPEG-2 NBC/MPEG-4 Audio standard. ISO/IEC givesusers of the MPEG-2 NBC/MPEG-4 Audio standards free license to thissoftware module or modifications thereof for use in hardware orsoftware products claiming conformance to the MPEG-2 NBC/ MPEG-4 Audiostandards. Those intending to use this software module in hardware orsoftware products are advised that this use may infringe existingpatents. The original developer of this software module and his/hercompany, the subsequent editors and their companies, and ISO/IEC haveno liability for use of this software module or modifications thereofin an implementation. Copyright is not released for non MPEG-2NBC/MPEG-4 Audio conforming products. The original developer retainsfull right to use the code for his/her own purpose, assign or donatethe code to a third party and to inhibit third party from using thecode for non MPEG-2 NBC/MPEG-4 Audio conforming products. Thiscopyright notice must be included in all copies or derivative works.Copyright (c) 1996. * Last modified: May 1, 1996 * */#include <math.h>#include "att_proto.h"#define MAXORDER 20/*---------------------------------------------------------------------------- * lsf2pc - convert lsf to predictor coefficients * * FIR filter using the line spectral frequencies * can, of course, also be use to get predictor coeff * from the line spectral frequencies *---------------------------------------------------------------------------- */void lsf2pc(float *pc,		/* output: predictor coeff: 1,a1,a2...*/const float *lsf,	/* input : line-spectral freqs [0,pi] */long order		/* input : predictor order */){   double mem[2*MAXORDER+2];   long i;   testbound(order, MAXORDER, "lsf2pc");   for (i=0; i< 2*order+2; i++) mem[i] = 0.0;   for (i=0; i< order+1; i++) pc[i] = 0.0;   pc[0]=1.0;   lsffir( pc, lsf, order, mem, order+1);}