/**************************************************************************                (C) Copyright 1990, Motorola Inc., U.S.A.Note:  Reproduction and use for the development of North American digital       cellular standards or development of digital speech coding       standards within the International Telecommunications Union -       Telecommunications Standardization Sector is authorized by Motorola        Inc.  No other use is intended or authorized.       The availability of this material does not provide any license       by implication, estoppel, or otherwise under any patent rights       of Motorola Inc. or others covering any use of the contents       herein.       Any copies or derivative works must incude this and all other       proprietary notices.Systems Research LaboratoriesChicago Corporate Research and Development CenterMotorola Inc.**************************************************************************//*-------------------------------------------------------------*//**//*	filters.c -- Filter routines.*//**//*-------------------------------------------------------------*//**//*	Written by: Matt Hartman*//**//*-------------------------------------------------------------*//*	inclusions*//**/#include "vparams.h"/*#include "stdlib.h"*//*--------------------------------------------------------------------------*//*	inverse (analysis, all-zero) filter*//**/void            I_DIR(inPtr, oPtr, stPtr, coefPtr, len)  FTYPE          *inPtr;  FTYPE          *oPtr;  FTYPE          *stPtr;  FTYPE          *coefPtr;  int             len;{  FTYPE          *cP, *iPtr, *endPtr, *freePtr;  int             i;/*	copy states and input into temp buffer*//**/  freePtr = (FTYPE *) malloc((len + NP) * sizeof(FTYPE));  iPtr = freePtr;  iPtr--;  for (endPtr = stPtr + NP; stPtr < endPtr; stPtr++)    *++iPtr = *stPtr;  for (endPtr = inPtr + len; inPtr < endPtr; inPtr++)    *++iPtr = *inPtr;  iPtr -= len - 1;/*	perform filter*//**/  for (endPtr = iPtr + len; iPtr < endPtr; iPtr++)  {    *oPtr = 0.0;    cP = coefPtr - 1;    for (i = 1; i <= NP; i++)      *oPtr += *(cP + i) * *(iPtr - i);    *oPtr += *iPtr;    oPtr++;  }/*	update states*//**/  stPtr--;  for (endPtr = stPtr - NP; stPtr > endPtr; stPtr--)    *stPtr = *--iPtr;  free(freePtr);}/*--------------------------------------------------------------------------*//*	synthesis (all-pole) filter*//**/void            DIR(inPtr, oPtr, stPtr, coefPtr, len)  FTYPE          *inPtr;  FTYPE          *oPtr;  FTYPE          *stPtr;  FTYPE          *coefPtr;  int             len;{  FTYPE          *cP, *tmpPtr, *endPtr, *freePtr;  int             i;/*	copy states into temp output buffer*//**/  freePtr = (FTYPE *) malloc((len + NP) * sizeof(FTYPE));  tmpPtr = freePtr;  for (endPtr = stPtr + NP; stPtr < endPtr; stPtr++)  {    *tmpPtr = *stPtr;    tmpPtr++;  }/*	perform filter*//**/  for (endPtr = tmpPtr + len; tmpPtr < endPtr; tmpPtr++)  {    *tmpPtr = 0.0;    cP = coefPtr - 1;    for (i = 1; i <= NP; i++)      *tmpPtr -= *(cP + i) * *(tmpPtr - i);    *tmpPtr += *inPtr;    *oPtr = *tmpPtr;    oPtr++;    inPtr++;  }/*	update states*//**/  stPtr--;  for (endPtr = stPtr - NP; stPtr > endPtr; stPtr--)    *stPtr = *--tmpPtr;  free(freePtr);}void            ZI_DIR(oPtr, stPtr, coefPtr, len)  FTYPE          *oPtr;  FTYPE          *stPtr;  FTYPE          *coefPtr;  int             len;{  FTYPE          *cP, *tmpPtr, *endPtr, *freePtr;  int             i;/*	copy states into temp output buffer*//**/  freePtr = (FTYPE *) malloc((len + NP) * sizeof(FTYPE));  tmpPtr = freePtr;  for (endPtr = stPtr + NP; stPtr < endPtr; stPtr++)  {    *tmpPtr = *stPtr;    tmpPtr++;  }/*	perform filter without input*//**/  for (endPtr = tmpPtr + len; tmpPtr < endPtr; tmpPtr++)  {    *tmpPtr = 0.0;    cP = coefPtr - 1;    for (i = 1; i <= NP; i++)      *tmpPtr -= *(cP + i) * *(tmpPtr - i);    *oPtr = *tmpPtr;    oPtr++;  }  free(freePtr);}