--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgsmhr1/sp_dec.h	Thu Dec 04 01:45:00 2025 +0000
@@ -0,0 +1,100 @@
+#ifndef __SP_DEC
+#define __SP_DEC
+
+#include "typedefs.h"
+
+/*_________________________________________________________________________
+ |                                                                         |
+ |                            Function Prototypes                          |
+ |_________________________________________________________________________|
+*/
+
+void   speechDecoder(Shortword pswParameters[],
+                            Shortword pswDecodedSpeechFrame[]);
+
+  void   aFlatRcDp(Longword *pL_R, Shortword *pswRc);
+
+  void   b_con(Shortword swCodeWord, short siNumBits,
+                      Shortword pswVectOut[]);
+
+  void   fp_ex(Shortword swOrigLagIn, Shortword pswLTPState[]);
+
+  Shortword g_corr1(Shortword *pswIn, Longword *pL_out);
+
+  Shortword g_corr1s(Shortword pswIn[], Shortword swEngyRShft,
+                            Longword *pL_out);
+
+  void   getSfrmLpc(short int siSoftInterpolation,
+                           Shortword swPrevR0, Shortword swNewR0,
+                           Shortword pswPrevFrmKs[],
+                           Shortword pswPrevFrmAs[],
+                           Shortword pswPrevFrmPFNum[],
+                           Shortword pswPrevFrmPFDenom[],
+                           Shortword pswNewFrmKs[],
+                           Shortword pswNewFrmAs[],
+                           Shortword pswNewFrmPFNum[],
+                           Shortword pswNewFrmPFDenom[],
+                           struct NormSw *psnsSqrtRs,
+                           Shortword *ppswSynthAs[],
+                           Shortword *ppswPFNumAs[],
+                           Shortword *ppswPFDenomAs[]);
+
+  void   get_ipjj(Shortword swLagIn,
+                         Shortword *pswIp, Shortword *pswJj);
+
+  short int interpolateCheck(Shortword pswRefKs[],
+                                    Shortword pswRefCoefsA[],
+                                    Shortword pswOldCoefsA[],
+                                    Shortword pswNewCoefsA[],
+                                    Shortword swOldPer,
+                                    Shortword swNewPer,
+                                    Shortword swRq,
+                                    struct NormSw *psnsSqrtRsOut,
+                                    Shortword pswCoefOutA[]);
+
+  void   lpcFir(Shortword pswInput[], Shortword pswCoef[],
+                       Shortword pswState[], Shortword pswFiltOut[]);
+
+  void   lpcIir(Shortword pswInput[], Shortword pswCoef[],
+                       Shortword pswState[], Shortword pswFiltOut[]);
+
+  void   lpcIrZsIir(Shortword pswCoef[], Shortword pswFiltOut[]);
+
+  void   lpcZiIir(Shortword pswCoef[], Shortword pswState[],
+                         Shortword pswFiltOut[]);
+
+  void   lpcZsFir(Shortword pswInput[], Shortword pswCoef[],
+                         Shortword pswFiltOut[]);
+
+  void   lpcZsIir(Shortword pswInput[], Shortword pswCoef[],
+                         Shortword pswFiltOut[]);
+
+  void   lpcZsIirP(Shortword pswCommonIO[], Shortword pswCoef[]);
+
+  Shortword r0BasedEnergyShft(Shortword swR0Index);
+
+  short  rcToADp(Shortword swAscale, Shortword pswRc[],
+                        Shortword pswA[]);
+
+  void   rcToCorrDpL(Shortword swAshift, Shortword swAscale,
+                            Shortword pswRc[], Longword pL_R[]);
+
+  void   res_eng(Shortword pswReflecCoefIn[], Shortword swRq,
+                        struct NormSw *psnsSqrtRsOut);
+
+  void   rs_rr(Shortword pswExcitation[], struct NormSw snsSqrtRs,
+                      struct NormSw *snsSqrtRsRr);
+
+  void   rs_rrNs(Shortword pswExcitation[], struct NormSw snsSqrtRs,
+                        struct NormSw *snsSqrtRsRr);
+
+  Shortword scaleExcite(Shortword pswVect[],
+                               Shortword swErrTerm, struct NormSw snsRS,
+                               Shortword pswScldVect[]);
+
+  Shortword sqroot(Longword L_SqrtIn);
+
+  void   v_con(Shortword pswBVects[], Shortword pswOutVect[],
+                      Shortword pswBitArray[], short int siNumBVctrs);
+
+#endif