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/lsfwt.c 314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Functions: Lsf_wt 324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REVISION HISTORY 354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Updated to accept new parameter, Flag *pOverflow. Placed 374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber file in the proper PV Software template. 384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: 404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1. Eliminated unused include files. 414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2. Replaced array addressing by pointers 424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3. Eliminated math operations that unnecessary checked for 434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber saturation, by evaluating the operands 444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4. Unrolled loops to speed up processing, use decrement loops 454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Replaced "int" and/or "char" with OSCL defined types. 474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Who: Date: 494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: 504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ------------------------------------------------------------------------------ 524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber INPUT AND OUTPUT DEFINITIONS 534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Inputs: 554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lsf -- Pointer to Word16 -- LSF vector 564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Outputs: 584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber wf -- Pointer to Word16 -- square of weighting factors 594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pOverflow -- Pointer to type Flag -- Flag set when overflow occurs 604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Returns: 624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Global Variables Used: 654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Local Variables Needed: 684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION DESCRIPTION 724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberCompute LSF weighting factors 744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber d[i] = lsf[i+1] - lsf[i-1] 764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber The weighting factors are approximated by two line segment 784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber First segment passes by the following 2 points: 804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber d[i] = 0Hz wf[i] = 3.347 824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber d[i] = 450Hz wf[i] = 1.8 834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Second segment passes by the following 2 points: 854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber d[i] = 450Hz wf[i] = 1.8 874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber d[i] = 1500Hz wf[i] = 1.0 884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if( d[i] < 450Hz ) 904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber wf[i] = 3.347 - ( (3.347-1.8) / (450-0)) * d[i] 914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber wf[i] = 1.8 - ( (1.8-1.0) / (1500-450)) * (d[i] - 450) 934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if( d[i] < 1843) 964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber wf[i] = 3427 - (28160*d[i])>>15 974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber wf[i] = 1843 - (6242*(d[i]-1843))>>15 994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REQUIREMENTS 1024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REFERENCES 1074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lsfwt.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 1094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber PSEUDO-CODE 1124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber RESOURCES USED 1174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber When the code is written for a specific target processor the 1184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber the resources used should be documented below. 1194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber STACK USAGE: [stack count for this module] + [variable to represent 1214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber stack usage for each subroutine called] 1224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber where: [stack usage variable] = stack usage for [subroutine 1244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber name] (see [filename].ext) 1254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber DATA MEMORY USED: x words 1274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber PROGRAM MEMORY USED: x words 1294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CLOCK CYCLES: [cycle count equation for this module] + [variable 1314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber used to represent cycle count for each subroutine 1324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber called] 1334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber where: [cycle count variable] = cycle count for [subroutine 1354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber name] (see [filename].ext) 1364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber*/ 1394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 1424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; INCLUDES 1434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 1444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "lsfwt.h" 1454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "cnst.h" 1464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 1484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; MACROS 1494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Define module specific macros here 1504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 1514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 1544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; DEFINES 1554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Include all pre-processor statements here. Include conditional 1564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; compile variables also. 1574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 1584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 1614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; LOCAL FUNCTION DEFINITIONS 1624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Function Prototype declaration 1634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 1644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 1674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; LOCAL STORE/BUFFER/POINTER DEFINITIONS 1684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Variable declaration - defined here and used outside this module 1694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 1704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 1724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; EXTERNAL FUNCTION REFERENCES 1734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Declare functions defined elsewhere and referenced in this module 1744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 1754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 1774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 1784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Declare variables used in this module but defined elsewhere 1794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 1804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 1834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; FUNCTION CODE 1844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 1854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Hubervoid Lsf_wt( 1874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *lsf, /* input : LSF vector */ 1884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *wf, /* output: square of weighting factors */ 1894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Flag *pOverflow 1904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber) 1914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 1924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 temp; 1934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 wgt_fct; 1944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 i; 1954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *p_wf = wf; 1964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *p_lsf = &lsf[0]; 1974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *p_lsf_2 = &lsf[1]; 1984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber OSCL_UNUSED_ARG(pOverflow); 2004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* wf[0] = lsf[1] - 0 */ 2024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *(p_wf++) = *(p_lsf_2++); 2034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 4; i != 0 ; i--) 2054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *(p_wf++) = *(p_lsf_2++) - *(p_lsf++); 2074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *(p_wf++) = *(p_lsf_2++) - *(p_lsf++); 2084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* 2104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * wf[9] = 4000 - lsf[8] 2114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber */ 2124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *(p_wf) = 16384 - *(p_lsf); 2134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber p_wf = wf; 2154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 10; i != 0; i--) 2174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* 2194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * (wf[i] - 450); 2204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * 1843 == 450 Hz (Q15 considering 7FFF = 8000 Hz) 2214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber */ 2224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber wgt_fct = *p_wf; 2234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber temp = wgt_fct - 1843; 2244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (temp > 0) 2264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber temp = (Word16)(((Word32)temp * 6242) >> 15); 2284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber wgt_fct = 1843 - temp; 2294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 2314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber temp = (Word16)(((Word32)wgt_fct * 28160) >> 15); 2334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber wgt_fct = 3427 - temp; 2344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *(p_wf++) = wgt_fct << 3; 2374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } /* for (i = 10; i != 0; i--) */ 2394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return; 2414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} /* Lsf_wt() */ 243