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------------------------------------------------------------------------------ 314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Pathname: ./audio/gsm-amr/c/src/b_cn_cod.c 354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Functions: pseudonoise 364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber build_CN_code 374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber build_CN_param 384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Date: 09/28/2000 404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REVISION HISTORY 434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Updated template. Cleaned up code. Passing in a pointer to 454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber overflow flag for build_CN_code() and build_CN_param() functions. 464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Removed unnecessary header files. 474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Make chnages per formal review. Fix error introduced during 484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber optimization in pseudonoise(). 494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: 514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber MODULE DESCRIPTION 544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber This module contains functions for comfort noise(CN) generation. 564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber*/ 594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; INCLUDES 634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "b_cn_cod.h" 654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "basic_op.h" 664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "cnst.h" 674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; MACROS 704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; [Define module specific macros here] 714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; DEFINES 764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; [Include all pre-processor statements here. Include conditional 774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; compile variables also.] 784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#define NB_PULSE 10 /* number of random pulses in DTX operation */ 804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; LOCAL FUNCTION DEFINITIONS 834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; [List function prototypes here] 844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; LOCAL VARIABLE DEFINITIONS 884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; [Variable declaration - defined here and used outside this module] 894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* 924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION NAME: pseudonoise 944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber INPUT AND OUTPUT DEFINITIONS 964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Inputs: 984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pShift_reg = pointer to Old CN generator shift register state (Word32) 994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber no_bits = Number of bits (Word16) 1004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Outputs: 1024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pShift_reg -> Updated CN generator shift register state 1034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Returns: 1054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber noise_bits = Generated random integer value (Word16) 1064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Global Variables Used: 1084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 1094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Local Variables Needed: 1114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 1124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION DESCRIPTION 1154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Generate a random integer value to use in comfort noise generation. The 1174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber algorithm uses polynomial x^31 + x^3 + 1. Length of the PN sequence 1184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber is 2^31 - 1 1194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REQUIREMENTS 1224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 1244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REFERENCES 1274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber b_cn_cod.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 1294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber PSEUDO-CODE 1324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberWord16 pseudonoise ( 1344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word32 *shift_reg, // i/o : Old CN generator shift register state 1354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 no_bits // i : Number of bits 1364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber) 1374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 1384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 noise_bits, Sn, i; 1394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber noise_bits = 0; 1414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 0; i < no_bits; i++) 1424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // State n == 31 1444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if ((*shift_reg & 0x00000001L) != 0) 1454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Sn = 1; 1474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 1494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Sn = 0; 1514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // State n == 3 1544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if ((*shift_reg & 0x10000000L) != 0) 1554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Sn = Sn ^ 1; 1574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 1594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Sn = Sn ^ 0; 1614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber noise_bits = shl (noise_bits, 1); 1644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber noise_bits = noise_bits | (extract_l (*shift_reg) & 1); 1654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *shift_reg = L_shr (*shift_reg, 1); 1674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (Sn & 1) 1684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *shift_reg = *shift_reg | 0x40000000L; 1704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return noise_bits; 1734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 1744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber RESOURCES USED [optional] 1774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber When the code is written for a specific target processor the 1794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber the resources used should be documented below. 1804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber HEAP MEMORY USED: x bytes 1824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber STACK MEMORY USED: x bytes 1844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 1864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber used to represent cycle count for each subroutine 1874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber called) 1884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber where: (cycle count variable) = cycle count for [subroutine 1894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber name] 1904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CAUTION [optional] 1934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber [State any special notes, constraints or cautions for users of this function] 1944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber*/ 1974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 1994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; FUNCTION CODE 2004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 2014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberWord16 pseudonoise( 2034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word32 *pShift_reg, /* i/o : Old CN generator shift register state */ 2044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 no_bits /* i : Number of bits */ 2054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber) 2064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 2074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 noise_bits; 2084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 Sn; 2094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 i; 2104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 temp; 2114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber noise_bits = 0; 2134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 0; i < no_bits; i++) 2154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* State n == 31 */ 2174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if ((*pShift_reg & 0x00000001L) != 0) 2184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Sn = 1; 2204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 2224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Sn = 0; 2244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* State n == 3 */ 2274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if ((*pShift_reg & 0x10000000L) != 0) 2284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Sn ^= 1; 2304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 2324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Sn ^= 0; 2344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber noise_bits <<= 1; 2374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber temp = (Word16)((*pShift_reg) & 1); 2394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber noise_bits |= temp; 2404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *pShift_reg >>= 1; 2424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (Sn & 1) 2434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *pShift_reg |= 0x40000000L; 2454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return noise_bits; 2484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 2494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* 2514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION NAME: build_CN_code 2534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber INPUT AND OUTPUT DEFINITIONS 2554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Inputs: 2574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pSeed = pointer to the Old CN generator shift register state (Word32) 2584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber cod[] = array to hold the generated CN fixed code vector (Word16) 2594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pOverflow = pointer to overflow flag (Flag) 2604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Outputs: 2624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber cod[] = generated CN fixed code vector (Word16) 2634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pSeed = Updated CN generator shift register state (Word16) 2644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pOverflow -> 1 if overflow occured 2654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Returns: 2674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 2684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Global Variables Used: 2704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 2714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Local Variables Needed: 2734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 2744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION DESCRIPTION 2774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberThis function computes the comfort noise fixed codebook excitation. The gains 2794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huberof the pulses are always +/-1. 2804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REQUIREMENTS 2834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 2854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REFERENCES 2884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber b_cn_cod.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 2904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber PSEUDO-CODE 2934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Hubervoid build_CN_code ( 2954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word32 *seed, // i/o : Old CN generator shift register state 2964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 cod[] // o : Generated CN fixed codebook vector 2974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber) 2984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 2994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 i, j, k; 3004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 0; i < L_SUBFR; i++) 3024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber cod[i] = 0; 3044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber// The reference ETSI code uses a global flag for Overflow. However in the 3074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber// actual implementation a pointer to the overflow flag is passed into the 3084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber// function so that it can be passed into the basic math functions L_mult() 3094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber// and add() 3104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (k = 0; k < NB_PULSE; k++) 3124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber i = pseudonoise (seed, 2); // generate pulse position 3144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber i = shr (extract_l (L_mult (i, 10)), 1); 3154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber i = add (i, k); 3164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber j = pseudonoise (seed, 1); // generate sign 3184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (j > 0) 3204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber cod[i] = 4096; 3224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 3244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber cod[i] = -4096; 3264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return; 3304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 3314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 3324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber RESOURCES USED [optional] 3334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber When the code is written for a specific target processor the 3354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber the resources used should be documented below. 3364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber HEAP MEMORY USED: x bytes 3384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber STACK MEMORY USED: x bytes 3404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 3424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber used to represent cycle count for each subroutine 3434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber called) 3444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber where: (cycle count variable) = cycle count for [subroutine 3454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber name] 3464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 3484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CAUTION [optional] 3494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber [State any special notes, constraints or cautions for users of this function] 3504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 3524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber*/ 3534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 3554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; FUNCTION CODE 3564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 3574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Hubervoid build_CN_code( 3584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word32 *pSeed, /* i/o : Old CN generator shift register state */ 3594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 cod[], /* o : Generated CN fixed codebook vector */ 3604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Flag *pOverflow /* i/o : Overflow flag */ 3614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber) 3624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 3634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 i, j, k; 3644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 temp; 3654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 0; i < L_SUBFR; i++) 3674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber cod[i] = 0; 3694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (k = 0; k < NB_PULSE; k++) 3724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber i = pseudonoise(pSeed, 2); /* generate pulse position */ 3744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber temp = (Word16)(L_mult(i, 10, pOverflow)); 3764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber i = temp >> 1; 3774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber i = add(i, k, pOverflow); 3784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber j = pseudonoise(pSeed, 1); /* generate sign */ 3804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (j > 0) 3824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber cod[i] = 4096; 3844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 3864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber cod[i] = -4096; 3884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return; 3924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 3934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* 3954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 3964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION NAME: build_CN_param 3974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 3984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber INPUT AND OUTPUT DEFINITIONS 3994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Inputs: 4014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pSeed = pointer to the Old CN generator shift register state (Word32) 4024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber n_param = Number of parameters to randomize (Word16) 4034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber param_size_table = table holding paameter sizes (Word16) 4044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber param[] = array to hold CN generated paramters (Word16) 4054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pOverflow = pointer to overflow flag (Flag) 4064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Outputs: 4084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber param[] = CN generated parameters (Word16) 4094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pSeed = Updated CN generator shift register state (Word16) 4104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pOverflow -> 1 if overflow occured 4114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Returns: 4134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 4144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Global Variables Used: 4164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 4174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Local Variables Needed: 4194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 4204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 4224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION DESCRIPTION 4234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberThis function randomizes the speech parameters, so that they do not produce 4254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Hubertonal artifacts if used by ECU. 4264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 4284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REQUIREMENTS 4294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 4314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 4334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REFERENCES 4344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber b_cn_cod.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 4364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 4384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber PSEUDO-CODE 4394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Hubervoid build_CN_param ( 4404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *seed, // i/o : Old CN generator shift register state 4414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber const Word16 n_param, // i : number of params 4424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber const Word16 param_size_table[],// i : size of params 4434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 parm[] // o : CN Generated params 4444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ) 4454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 4464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 i; 4474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber const Word16 *p; 4484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber// The reference ETSI code uses a global flag for Overflow. However in the 4504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber// actual implementation a pointer to the overflow flag is passed into the 4514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber// function so that it can be passed into the basic math functions L_add() 4524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber// and L_mult() 4534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *seed = extract_l(L_add(L_shr(L_mult(*seed, 31821), 1), 13849L)); 4554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber p = &window_200_40[*seed & 0x7F]; 4574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for(i=0; i< n_param;i++){ 4584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber parm[i] = *p++ & ~(0xFFFF<<param_size_table[i]); 4594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 4604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 4614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 4644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber RESOURCES USED [optional] 4654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber When the code is written for a specific target processor the 4674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber the resources used should be documented below. 4684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber HEAP MEMORY USED: x bytes 4704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber STACK MEMORY USED: x bytes 4724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 4744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber used to represent cycle count for each subroutine 4754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber called) 4764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber where: (cycle count variable) = cycle count for [subroutine 4774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber name] 4784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 4804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CAUTION [optional] 4814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber [State any special notes, constraints or cautions for users of this function] 4824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 4844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber*/ 4854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 4874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; FUNCTION CODE 4884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 4894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Hubervoid build_CN_param( 4904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *pSeed, /* i/o : Old CN generator shift register state */ 4914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber const Word16 n_param, /* i : number of params */ 4924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber const Word16 param_size_table[],/* i : size of params */ 4934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 parm[], /* o : CN Generated params */ 4944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Flag *pOverflow /* i/o : Overflow Flag */ 4954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber) 4964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 4984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 i; 4994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber const Word16 *pTemp; 5004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word32 L_temp; 5014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 temp; 5024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 5034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_temp = L_mult(*pSeed, 31821, pOverflow); 5044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_temp >>= 1; 5054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 5064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *pSeed = (Word16)(L_add(L_temp, 13849L, pOverflow)); 5074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 5084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pTemp = &window_200_40[*pSeed & 0x7F]; 5094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 5104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 0; i < n_param; i++) 5114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber temp = ~(0xFFFF << param_size_table[i]); 5134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber parm[i] = *pTemp++ & temp; 5144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 5164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 517