1a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/* ------------------------------------------------------------------ 2a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * Copyright (C) 1998-2009 PacketVideo 3a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * 4a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * Licensed under the Apache License, Version 2.0 (the "License"); 5a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * you may not use this file except in compliance with the License. 6a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * You may obtain a copy of the License at 7a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * 8a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * http://www.apache.org/licenses/LICENSE-2.0 9a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * 10a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * Unless required by applicable law or agreed to in writing, software 11a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * distributed under the License is distributed on an "AS IS" BASIS, 12a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * express or implied. 14a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * See the License for the specific language governing permissions 15a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * and limitations under the License. 16a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * ------------------------------------------------------------------- 17a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber */ 18a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/**************************************************************************************** 19a30d40083856cb4edd225faf8b488fab156e5976Andreas HuberPortions of this file are derived from the following 3GPP standard: 20a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 21a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 3GPP TS 26.073 22a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec 23a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Available from http://www.3gpp.org 24a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 25a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) 26a30d40083856cb4edd225faf8b488fab156e5976Andreas HuberPermission to distribute, modify and use this file under the standard license 27a30d40083856cb4edd225faf8b488fab156e5976Andreas Huberterms listed above has been obtained from the copyright holder. 28a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber****************************************************************************************/ 29a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/* 30a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Pathname: ./audio/gsm-amr/c/src/int_lpc.c 31a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Functions: 32a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 33a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 34a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber REVISION HISTORY 35a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 36a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Description: Updated template used to PV coding template. 37a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Changed to accept the pOverflow flag for EPOC compatibility. 38a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 39a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Description: Per review comments, replaced includes of "basic_op.h" 40a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber and "count.h" with "shr.h", "sub.h", and "add.h" 41a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 42a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Description: For Int_lpc_1and3() and Int_lpc_1and3_2() 43a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 1. Replaced array addressing by pointers 44a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 2. Eliminated math operations that unnecessary checked for 45a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber saturation 46a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 3. Unrolled loops to speed up processing 47a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 48a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Description: Replaced "int" and/or "char" with OSCL defined types. 49a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 50a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 51a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Who: Date: 52a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Description: 53a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 54a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 55a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber MODULE DESCRIPTION 56a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 57a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 58a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 59a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber*/ 60a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 61a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/*---------------------------------------------------------------------------- 62a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; INCLUDES 63a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber----------------------------------------------------------------------------*/ 64a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber#include "int_lpc.h" 65a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber#include "typedef.h" 66a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber#include "cnst.h" 67a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber#include "lsp_az.h" 68a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber#include "basic_op.h" 69a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 70a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/*---------------------------------------------------------------------------- 71a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; MACROS 72a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; Define module specific macros here 73a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber----------------------------------------------------------------------------*/ 74a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 75a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/*---------------------------------------------------------------------------- 76a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; DEFINES 77a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; Include all pre-processor statements here. Include conditional 78a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; compile variables also. 79a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber----------------------------------------------------------------------------*/ 80a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 81a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/*---------------------------------------------------------------------------- 82a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; LOCAL FUNCTION DEFINITIONS 83a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; Function Prototype declaration 84a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber----------------------------------------------------------------------------*/ 85a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 86a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/*---------------------------------------------------------------------------- 87a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; LOCAL VARIABLE DEFINITIONS 88a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; Variable declaration - defined here and used outside this module 89a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber----------------------------------------------------------------------------*/ 90a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 91a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 92a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/* 93a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 94a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber FUNCTION NAME: Int_lpc_1and3 95a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 96a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber INPUT AND OUTPUT DEFINITIONS 97a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 98a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Inputs: 99a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp_old -- array of type Word16 -- LSP vector at the 100a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 4th subfr. of past frame (M) 101a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp_mid -- array of type Word16 -- LSP vector at the 2nd subfr. of 102a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber present frame (M) 103a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp_new -- array of type Word16 -- LSP vector at the 4th subfr. of 104a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber present frame (M) 105a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 106a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Outputs: 107a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az -- array of type Word16 -- interpolated LP parameters in all subfr. 108a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber (AZ_SIZE) 109a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber pOverflow -- pointer to type Flag -- Overflow indicator 110a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 111a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Returns: 112a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 113a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 114a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Global Variables Used: 115a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 116a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 117a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Local Variables Needed: 118a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 119a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 120a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 121a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber FUNCTION DESCRIPTION 122a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 123a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Purpose : Interpolates the LSPs and converts to LPC parameters 124a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber to get a different LP filter in each subframe. 125a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Description : The 20 ms speech frame is divided into 4 subframes. 126a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber The LSPs are quantized and transmitted at the 2nd and 127a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 4th subframes (twice per frame) and interpolated at the 128a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 1st and 3rd subframe. 129a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 130a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber |------|------|------|------| 131a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber sf1 sf2 sf3 sf4 132a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber F0 Fm F1 133a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 134a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber sf1: 1/2 Fm + 1/2 F0 sf3: 1/2 F1 + 1/2 Fm 135a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber sf2: Fm sf4: F1 136a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 137a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 138a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber REQUIREMENTS 139a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 140a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 141a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 142a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 143a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber REFERENCES 144a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 145a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber int_lpc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 146a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 147a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 148a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber PSEUDO-CODE 149a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 150a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 151a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 152a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber RESOURCES USED [optional] 153a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 154a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber When the code is written for a specific target processor the 155a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber the resources used should be documented below. 156a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 157a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber HEAP MEMORY USED: x bytes 158a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 159a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber STACK MEMORY USED: x bytes 160a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 161a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 162a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber used to represent cycle count for each subroutine 163a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber called) 164a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber where: (cycle count variable) = cycle count for [subroutine 165a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber name] 166a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 167a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 168a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber CAUTION [optional] 169a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber [State any special notes, constraints or cautions for users of this function] 170a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 171a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 172a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber*/ 173a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 174a30d40083856cb4edd225faf8b488fab156e5976Andreas Hubervoid Int_lpc_1and3( 175a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */ 176a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 lsp_mid[], /* i : LSP vector at the 2nd subfr. of 177a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber present frame (M) */ 178a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 lsp_new[], /* i : LSP vector at the 4th subfr. of 179a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber present frame (M) */ 180a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 Az[], /* o : interpolated LP parameters in all subfr. 181a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber (AZ_SIZE) */ 182a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Flag *pOverflow 183a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber) 184a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber{ 185a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 i; 186a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 lsp[M]; 187a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 *p_lsp_old = &lsp_old[0]; 188a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 *p_lsp_mid = &lsp_mid[0]; 189a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 *p_lsp_new = &lsp_new[0]; 190a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 *p_lsp = &lsp[0]; 191a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 192a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber /* lsp[i] = lsp_mid[i] * 0.5 + lsp_old[i] * 0.5 */ 193a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 194a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber for (i = M >> 1; i != 0; i--) 195a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 196a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber *(p_lsp++) = (*(p_lsp_old++) >> 1) + (*(p_lsp_mid++) >> 1); 197a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber *(p_lsp++) = (*(p_lsp_old++) >> 1) + (*(p_lsp_mid++) >> 1); 198a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 199a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 200a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Lsp_Az( 201a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp, 202a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az, 203a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber pOverflow); /* Subframe 1 */ 204a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 205a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az += MP1; 206a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 207a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Lsp_Az( 208a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp_mid, 209a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az, 210a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber pOverflow); /* Subframe 2 */ 211a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 212a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az += MP1; 213a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 214a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber p_lsp_mid = &lsp_mid[0]; 215a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber p_lsp = &lsp[0]; 216a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 217a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber for (i = M >> 1; i != 0; i--) 218a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 219a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber *(p_lsp++) = (*(p_lsp_mid++) >> 1) + (*(p_lsp_new++) >> 1); 220a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber *(p_lsp++) = (*(p_lsp_mid++) >> 1) + (*(p_lsp_new++) >> 1); 221a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 222a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 223a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Lsp_Az( 224a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp, 225a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az, 226a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber pOverflow); /* Subframe 3 */ 227a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 228a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az += MP1; 229a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 230a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Lsp_Az( 231a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp_new, 232a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az, 233a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber pOverflow); /* Subframe 4 */ 234a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 235a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber return; 236a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber} 237a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 238a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 239a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/* 240a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 241a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber FUNCTION NAME: Int_lpc_1and3_2 242a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 243a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber INPUT AND OUTPUT DEFINITIONS 244a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 245a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Inputs: 246a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp_old -- array of type Word16 -- LSP vector at the 247a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 4th subfr. of past frame (M) 248a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp_mid -- array of type Word16 -- LSP vector at the 2nd subfr. of 249a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber present frame (M) 250a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp_new -- array of type Word16 -- LSP vector at the 4th subfr. of 251a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber present frame (M) 252a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 253a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Outputs: 254a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az -- array of type Word16 -- interpolated LP parameters in. 255a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber subfr 1 and 2. 256a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber pOverflow -- pointer to type Flag -- Overflow indicator 257a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 258a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Returns: 259a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 260a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 261a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Global Variables Used: 262a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 263a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 264a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Local Variables Needed: 265a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 266a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 267a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 268a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber FUNCTION DESCRIPTION 269a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 270a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Purpose : Interpolation of the LPC parameters. Same as the Int_lpc 271a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber function but we do not recompute Az() for subframe 2 and 272a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 4 because it is already available. 273a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 274a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 275a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber REQUIREMENTS 276a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 277a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 278a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 279a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 280a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber REFERENCES 281a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 282a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber int_lpc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 283a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 284a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 285a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber PSEUDO-CODE 286a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 287a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 288a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 289a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber RESOURCES USED [optional] 290a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 291a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber When the code is written for a specific target processor the 292a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber the resources used should be documented below. 293a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 294a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber HEAP MEMORY USED: x bytes 295a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 296a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber STACK MEMORY USED: x bytes 297a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 298a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 299a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber used to represent cycle count for each subroutine 300a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber called) 301a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber where: (cycle count variable) = cycle count for [subroutine 302a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber name] 303a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 304a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 305a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber CAUTION [optional] 306a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber [State any special notes, constraints or cautions for users of this function] 307a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 308a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 309a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber*/ 310a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 311a30d40083856cb4edd225faf8b488fab156e5976Andreas Hubervoid Int_lpc_1and3_2( 312a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */ 313a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 lsp_mid[], /* i : LSP vector at the 2nd subframe of 314a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber present frame (M) */ 315a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 lsp_new[], /* i : LSP vector at the 4th subframe of 316a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber present frame (M) */ 317a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 Az[], /* o :interpolated LP parameters 318a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber in subframes 1 and 3 (AZ_SIZE) */ 319a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Flag *pOverflow 320a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber) 321a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber{ 322a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 i; 323a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 lsp[M]; 324a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 *p_lsp_old = &lsp_old[0]; 325a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 *p_lsp_mid = &lsp_mid[0]; 326a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 *p_lsp_new = &lsp_new[0]; 327a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 *p_lsp = &lsp[0]; 328a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 329a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber /* lsp[i] = lsp_mid[i] * 0.5 + lsp_old[i] * 0.5 */ 330a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 331a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber for (i = M >> 1; i != 0; i--) 332a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 333a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber *(p_lsp++) = (*(p_lsp_old++) >> 1) + (*(p_lsp_mid++) >> 1); 334a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber *(p_lsp++) = (*(p_lsp_old++) >> 1) + (*(p_lsp_mid++) >> 1); 335a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 336a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Lsp_Az(lsp, Az, pOverflow); /* Subframe 1 */ 337a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az += MP1 * 2; 338a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 339a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber p_lsp_mid = &lsp_mid[0]; 340a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber p_lsp = &lsp[0]; 341a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 342a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber for (i = M >> 1; i != 0; i--) 343a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 344a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber *(p_lsp++) = (*(p_lsp_mid++) >> 1) + (*(p_lsp_new++) >> 1); 345a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber *(p_lsp++) = (*(p_lsp_mid++) >> 1) + (*(p_lsp_new++) >> 1); 346a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 347a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 348a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Lsp_Az(lsp, Az, pOverflow); /* Subframe 3 */ 349a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 350a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber return; 351a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber} 352a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 353a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 354a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/* 355a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 356a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber FUNCTION NAME: lsp 357a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 358a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber INPUT AND OUTPUT DEFINITIONS 359a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 360a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Inputs: 361a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp_old -- array of type Word16 -- LSP vector at the 362a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 4th subfr. of past frame (M) 363a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp_new -- array of type Word16 -- LSP vector at the 4th subfr. of 364a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber present frame (M) 365a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 366a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Outputs: 367a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az -- array of type Word16 -- interpolated LP parameters in. 368a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber all subframes. 369a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber pOverflow -- pointer to type Flag -- Overflow indicator 370a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 371a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Returns: 372a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 373a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 374a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Global Variables Used: 375a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 376a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 377a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Local Variables Needed: 378a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 379a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 380a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 381a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber FUNCTION DESCRIPTION 382a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 383a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber PURPOSE: Interpolates the LSPs and convert to LP parameters to get 384a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber a different LP filter in each subframe. 385a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 386a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber DESCRIPTION: 387a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber The 20 ms speech frame is divided into 4 subframes. 388a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber The LSPs are quantized and transmitted at the 4th subframe 389a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber (once per frame) and interpolated at the 1st, 2nd and 3rd subframe. 390a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 391a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber |------|------|------|------| 392a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber sf1 sf2 sf3 sf4 393a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber F0 F1 394a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 395a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber sf1: 3/4 F0 + 1/4 F1 sf3: 1/4 F0 + 3/4 F1 396a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber sf2: 1/2 F0 + 1/2 F1 sf4: F1 397a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 398a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 399a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber REQUIREMENTS 400a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 401a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 402a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 403a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 404a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber REFERENCES 405a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 406a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber int_lpc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 407a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 408a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 409a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber PSEUDO-CODE 410a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 411a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 412a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 413a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber RESOURCES USED [optional] 414a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 415a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber When the code is written for a specific target processor the 416a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber the resources used should be documented below. 417a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 418a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber HEAP MEMORY USED: x bytes 419a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 420a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber STACK MEMORY USED: x bytes 421a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 422a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 423a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber used to represent cycle count for each subroutine 424a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber called) 425a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber where: (cycle count variable) = cycle count for [subroutine 426a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber name] 427a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 428a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 429a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber CAUTION [optional] 430a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber [State any special notes, constraints or cautions for users of this function] 431a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 432a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 433a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber*/ 434a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 435a30d40083856cb4edd225faf8b488fab156e5976Andreas Hubervoid Int_lpc_1to3( 436a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 lsp_old[], /* input : LSP vector at the 4th SF of past frame */ 437a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 lsp_new[], /* input : LSP vector at the 4th SF of present frame */ 438a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 Az[], /* output: interpolated LP parameters in all SFs */ 439a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Flag *pOverflow 440a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber) 441a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber{ 442a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 i; 443a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 temp; 444a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 temp2; 445a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 446a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 lsp[M]; 447a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 448a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber for (i = 0; i < M; i++) 449a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 450a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber temp = shr(lsp_old[i], 2, pOverflow); 451a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber temp = sub(lsp_old[i], temp, pOverflow); 452a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber temp2 = shr(lsp_new[i], 2, pOverflow); 453a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 454a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp[i] = add(temp2, temp, pOverflow); 455a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 456a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 457a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Lsp_Az( 458a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp, 459a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az, 460a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber pOverflow); /* Subframe 1 */ 461a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 462a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az += MP1; 463a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 464a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 465a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber for (i = 0; i < M; i++) 466a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 467a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber temp = shr(lsp_new[i], 1, pOverflow); 468a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber temp2 = shr(lsp_old[i], 1, pOverflow); 469a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp[i] = add(temp, temp2, pOverflow); 470a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 471a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 472a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Lsp_Az( 473a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp, 474a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az, 475a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber pOverflow); /* Subframe 2 */ 476a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 477a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az += MP1; 478a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 479a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber for (i = 0; i < M; i++) 480a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 481a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber temp = shr(lsp_new[i], 2, pOverflow); 482a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber temp = sub(lsp_new[i], temp, pOverflow); 483a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber temp2 = shr(lsp_old[i], 2, pOverflow); 484a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 485a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp[i] = add(temp2, temp, pOverflow); 486a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 487a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 488a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Lsp_Az( 489a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp, 490a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az, 491a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber pOverflow); /* Subframe 3 */ 492a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 493a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az += MP1; 494a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 495a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Lsp_Az( 496a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp_new, 497a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az, 498a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber pOverflow); /* Subframe 4 */ 499a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 500a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber return; 501a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber} 502a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/* 503a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 504a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber FUNCTION NAME: Int_lpc_1to3_2 505a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 506a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber INPUT AND OUTPUT DEFINITIONS 507a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 508a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Inputs: 509a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp_old -- array of type Word16 -- LSP vector at the 510a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 4th subfr. of past frame (M) 511a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp_new -- array of type Word16 -- LSP vector at the 4th subfr. of 512a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber present frame (M) 513a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 514a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Outputs: 515a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az -- array of type Word16 -- interpolated LP parameters in. 516a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber subfr 1, 2, and 3. 517a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber pOverflow -- pointer to type Flag -- Overflow indicator 518a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 519a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Returns: 520a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 521a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 522a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Global Variables Used: 523a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 524a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 525a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Local Variables Needed: 526a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 527a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 528a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 529a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber FUNCTION DESCRIPTION 530a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 531a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Interpolation of the LPC parameters. 532a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Same as the previous function but we do not recompute Az() for 533a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber subframe 4 because it is already available. 534a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 535a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 536a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber REQUIREMENTS 537a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 538a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 539a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 540a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 541a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber REFERENCES 542a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 543a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber int_lpc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 544a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 545a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 546a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber PSEUDO-CODE 547a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 548a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 549a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 550a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber RESOURCES USED [optional] 551a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 552a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber When the code is written for a specific target processor the 553a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber the resources used should be documented below. 554a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 555a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber HEAP MEMORY USED: x bytes 556a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 557a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber STACK MEMORY USED: x bytes 558a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 559a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 560a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber used to represent cycle count for each subroutine 561a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber called) 562a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber where: (cycle count variable) = cycle count for [subroutine 563a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber name] 564a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 565a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 566a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber CAUTION [optional] 567a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber [State any special notes, constraints or cautions for users of this function] 568a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 569a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 570a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber*/ 571a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 572a30d40083856cb4edd225faf8b488fab156e5976Andreas Hubervoid Int_lpc_1to3_2( 573a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 lsp_old[], /* input : LSP vector at the 4th SF of past frame */ 574a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 lsp_new[], /* input : LSP vector at the 4th SF of present frame */ 575a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 Az[], /* output: interpolated LP parameters in SFs 1,2,3 */ 576a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Flag *pOverflow 577a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber) 578a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber{ 579a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 i; 580a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 temp; 581a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 temp2; 582a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 lsp[M]; 583a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 584a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber for (i = 0; i < M; i++) 585a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 586a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber temp = shr(lsp_old[i], 2, pOverflow); 587a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 588a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber temp = sub(lsp_old[i], temp, pOverflow); 589a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 590a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber temp2 = shr(lsp_new[i], 2, pOverflow); 591a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 592a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp[i] = add(temp2, temp, pOverflow); 593a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 594a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 595a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Lsp_Az( 596a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp, 597a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az, 598a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber pOverflow); /* Subframe 1 */ 599a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 600a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az += MP1; 601a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 602a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber for (i = 0; i < M; i++) 603a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 604a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber temp = shr(lsp_new[i], 1, pOverflow); 605a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber temp2 = shr(lsp_old[i], 1, pOverflow); 606a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 607a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp[i] = add(temp2, temp, pOverflow); 608a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 609a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 610a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Lsp_Az( 611a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp, 612a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az, 613a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber pOverflow); /* Subframe 2 */ 614a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 615a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az += MP1; 616a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 617a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber for (i = 0; i < M; i++) 618a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 619a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber temp = shr(lsp_new[i], 2, pOverflow); 620a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber temp = sub(lsp_new[i], temp, pOverflow); 621a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber temp2 = shr(lsp_old[i], 2, pOverflow); 622a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 623a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp[i] = add(temp, temp2, pOverflow); 624a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 625a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 626a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Lsp_Az( 627a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber lsp, 628a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Az, 629a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber pOverflow); /* Subframe 3 */ 630a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 631a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber return; 632a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber} 633a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 634