14f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* ------------------------------------------------------------------ 24f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * Copyright (C) 1998-2009 PacketVideo 34f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * 44f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * Licensed under the Apache License, Version 2.0 (the "License"); 54f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * you may not use this file except in compliance with the License. 64f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * You may obtain a copy of the License at 74f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * 84f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * http://www.apache.org/licenses/LICENSE-2.0 94f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * 104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * Unless required by applicable law or agreed to in writing, software 114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * distributed under the License is distributed on an "AS IS" BASIS, 124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * express or implied. 144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * See the License for the specific language governing permissions 154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * and limitations under the License. 164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * ------------------------------------------------------------------- 174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber */ 184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/**************************************************************************************** 194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberPortions of this file are derived from the following 3GPP standard: 204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3GPP TS 26.073 224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec 234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Available from http://www.3gpp.org 244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) 264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberPermission to distribute, modify and use this file under the standard license 274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huberterms listed above has been obtained from the copyright holder. 284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber****************************************************************************************/ 294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* 304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Pathname: ./audio/gsm-amr/c/src/lsp_lsf.c 314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Functions: Lsp_lsf 324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Lsf_lsp 334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REVISION HISTORY 364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Updated template used to PV coding template. 384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Deleted variables listed in the Local Stores Needed/Modified 404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber section. 414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Synchronized file with UMTS version 3.2.0. Updated coding 434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber template and removed unnecessary include files. 444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Replaced basic_op.h with the header file of the math functions 464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber used in the file. 474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Changed to accept the pOverflow flag for EPOC compatibility. 494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Placed table declarations in a .c file, rather than an included 514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber .tab. The tables are now referenced via an extern in this file. 524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: For Lsp_lsf() 544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1. Eliminated unused include file typedef.h. 554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2. Replaced array addressing by pointers 564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Replaced "int" and/or "char" with defined types. 584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Added proper casting (Word32) to some left shifting operations 594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Changed round function name to pv_round to avoid conflict with 614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber round function in C standard library. 624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Added #ifdef __cplusplus around extern'ed table. 644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Who: Date: 664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: 674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber MODULE DESCRIPTION 704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber This file contains the functions that convert line spectral pairs (LSP) to 724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber line spectral frequencies (LSF) and vice-versa. 734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber*/ 764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; INCLUDES 794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "lsp_lsf.h" 814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "basicop_malloc.h" 824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "basic_op.h" 834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*--------------------------------------------------------------------------*/ 854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#ifdef __cplusplus 864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huberextern "C" 874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#endif 894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /*---------------------------------------------------------------------------- 914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ; MACROS 924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ; Define module specific macros here 934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ----------------------------------------------------------------------------*/ 944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /*---------------------------------------------------------------------------- 964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ; DEFINES 974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ; Include all pre-processor statements here. Include conditional 984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ; compile variables also. 994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ----------------------------------------------------------------------------*/ 1004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /*---------------------------------------------------------------------------- 1024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ; LOCAL FUNCTION DEFINITIONS 1034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ; Function Prototype declaration 1044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ----------------------------------------------------------------------------*/ 1054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /*---------------------------------------------------------------------------- 1074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ; LOCAL VARIABLE DEFINITIONS 1084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ; Variable declaration - defined here and used outside this module 1094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ----------------------------------------------------------------------------*/ 1104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber extern const Word16 table[]; 1124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber extern const Word16 slope[]; 1134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /*--------------------------------------------------------------------------*/ 1164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#ifdef __cplusplus 1174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 1184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#endif 1194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* 1214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION NAME: Lsf_lsp 1234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber INPUT AND OUTPUT DEFINITIONS 1254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Inputs: 1274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lsf = buffer containing normalized line spectral frequencies; valid 1284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber range is between 0 and 0.5 (Word16) 1294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lsp = buffer containing line spectral pairs; valid range is between 1304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber -1 and 1 (Word16) 1314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber m = LPC order (Word16) 1324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Outputs: 1344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lsp contains the newly calculated line spectral pairs 1354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Returns: 1374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 1384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Global Variables Used: 1404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber table = cosine table 1414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Local Variables Needed: 1434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 1444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION DESCRIPTION 1474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber This function performs the LSF to LSP transformation using the equation: 1494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lsf[i] = arccos(lsp[i])/(2*pi) 1514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber The transformation from lsp[i] to lsf[i] is approximated by a look-up table 1534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber and interpolation. 1544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REQUIREMENTS 1574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 1594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REFERENCES 1624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lsp_lsf.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 1644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber PSEUDO-CODE 1674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Hubervoid Lsf_lsp ( 1694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 lsf[], // (i) : lsf[m] normalized (range: 0.0<=val<=0.5) 1704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 lsp[], // (o) : lsp[m] (range: -1<=val<1) 1714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 m // (i) : LPC order 1724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber) 1734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 1744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 i, ind, offset; 1754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word32 L_tmp; 1764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 0; i < m; i++) 1784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ind = shr (lsf[i], 8); // ind = b8-b15 of lsf[i] 1804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber offset = lsf[i] & 0x00ff; // offset = b0-b7 of lsf[i] 1814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // lsp[i] = table[ind]+ ((table[ind+1]-table[ind])*offset) / 256 1834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_tmp = L_mult (sub (table[ind + 1], table[ind]), offset); 1854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lsp[i] = add (table[ind], extract_l (L_shr (L_tmp, 9))); 1864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return; 1894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 1904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber RESOURCES USED [optional] 1934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber When the code is written for a specific target processor the 1954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber the resources used should be documented below. 1964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber HEAP MEMORY USED: x bytes 1984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber STACK MEMORY USED: x bytes 2004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 2024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber used to represent cycle count for each subroutine 2034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber called) 2044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber where: (cycle count variable) = cycle count for [subroutine 2054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber name] 2064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CAUTION [optional] 2094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber [State any special notes, constraints or cautions for users of this function] 2104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber*/ 2134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Hubervoid Lsf_lsp( 2154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 lsf[], /* (i) : lsf[m] normalized (range: 0.0<=val<=0.5) */ 2164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 lsp[], /* (o) : lsp[m] (range: -1<=val<1) */ 2174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 m, /* (i) : LPC order */ 2184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Flag *pOverflow /* (o) : Flag set when overflow occurs */ 2194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber) 2204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 2214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 i, ind, offset; 2224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word32 L_tmp; 2234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 0; i < m; i++) 2254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ind = lsf[i] >> 8; /* ind = b8-b15 of lsf[i] */ 2274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber offset = lsf[i] & 0x00ff; /* offset = b0-b7 of lsf[i] */ 2284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* lsp[i] = table[ind]+ ((table[ind+1]-table[ind])*offset) / 256 */ 2304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_tmp = ((Word32)(table[ind + 1] - table[ind]) * offset) >> 8; 2324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lsp[i] = add(table[ind], (Word16) L_tmp, pOverflow); 2334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return; 2374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 2384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/****************************************************************************/ 2404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* 2434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION NAME: Lsp_lsf 2454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber INPUT AND OUTPUT DEFINITIONS 2474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Inputs: 2494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lsp = buffer containing line spectral pairs; valid range is between 2504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber -1 and 1 (Word16) 2514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lsf = buffer containing normalized line spectral frequencies; valid 2524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber range is between 0 and 0.5 (Word16) 2534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber m = LPC order (Word16) 2544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Outputs: 2564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lsf contains the newly calculated normalized line spectral frequencies 2574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Returns: 2594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 2604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Global Variables Used: 2624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber table = cosine table 2634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber slope = table to used to calculate inverse cosine 2644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Local Variables Needed: 2664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 2674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION DESCRIPTION 2704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber This function performs the LSP to LSF transformation using the equation: 2724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lsp[i] = cos(2*pi*lsf[i]) 2744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber The transformation from lsf[i] to lsp[i] is approximated by a look-up table 2764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber and interpolation. 2774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REQUIREMENTS 2804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 2824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REFERENCES 2854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lsp_lsf.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 2874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber PSEUDO-CODE 2904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Hubervoid Lsp_lsf ( 2924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 lsp[], // (i) : lsp[m] (range: -1<=val<1) 2934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 lsf[], // (o) : lsf[m] normalized (range: 0.0<=val<=0.5) 2944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 m // (i) : LPC order 2954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber) 2964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 2974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 i, ind; 2984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word32 L_tmp; 2994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ind = 63; // begin at end of table -1 3014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = m - 1; i >= 0; i--) 3034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // find value in table that is just greater than lsp[i] 3054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber while (sub (table[ind], lsp[i]) < 0) 3074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ind--; 3094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // acos(lsp[i])= ind*256 + ( ( lsp[i]-table[ind] ) * 3134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber slope[ind] )/4096 3144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_tmp = L_mult (sub (lsp[i], table[ind]), slope[ind]); 3164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber //(lsp[i]-table[ind])*slope[ind])>>12 3174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lsf[i] = pv_round (L_shl (L_tmp, 3)); 3184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lsf[i] = add (lsf[i], shl (ind, 8)); 3194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return; 3214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 3224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 3244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber RESOURCES USED [optional] 3254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber When the code is written for a specific target processor the 3274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber the resources used should be documented below. 3284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber HEAP MEMORY USED: x bytes 3304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber STACK MEMORY USED: x bytes 3324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 3344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber used to represent cycle count for each subroutine 3354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber called) 3364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber where: (cycle count variable) = cycle count for [subroutine 3374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber name] 3384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 3404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CAUTION [optional] 3414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber [State any special notes, constraints or cautions for users of this function] 3424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 3444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber*/ 3454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Hubervoid Lsp_lsf( 3474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 lsp[], /* (i) : lsp[m] (range: -1<=val<1) */ 3484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 lsf[], /* (o) : lsf[m] normalized (range: 0.0<=val<=0.5) */ 3494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 m, /* (i) : LPC order */ 3504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Flag *pOverflow /* (o) : Flag set when overflow occurs */ 3514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber) 3524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 3534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 i; 3544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 ind; 3554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 temp; 3564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word32 L_tmp; 3574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *p_lsp = &lsp[m-1]; 3584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *p_lsf = &lsf[m-1]; 3594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber OSCL_UNUSED_ARG(pOverflow); 3604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ind = 63; /* begin at end of table -1 */ 3624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = m - 1; i >= 0; i--) 3644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* find value in table that is just greater than lsp[i] */ 3664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber temp = *(p_lsp--); 3674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber while (table[ind] < temp) 3684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ind--; 3704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* acos(lsp[i])= ind*256 + ( ( lsp[i]-table[ind] ) * 3734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber slope[ind] )/4096 */ 3744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_tmp = (Word32)(temp - table[ind]) * slope[ind]; 3764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /*(lsp[i]-table[ind])*slope[ind])>>12*/ 3784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_tmp = (L_tmp + 0x00000800) >> 12; 3794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *(p_lsf--) = (Word16)(L_tmp) + (ind << 8); 3814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return; 3844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 385