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 Pathname: ./audio/gsm-amr/c/src/bgnscd.c 334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Functions: 344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Bgn_scd_reset 354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Bgn_scd 364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber MODULE DESCRIPTION 394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Background noise source characteristic detector (SCD) 414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber*/ 444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; INCLUDES 484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include <string.h> 504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "bgnscd.h" 524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "typedef.h" 534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "basic_op.h" 544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "cnst.h" 554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "copy.h" 564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "gmed_n.h" 574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "sqrt_l.h" 584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; MACROS 614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Define module specific macros here 624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; DEFINES 674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Include all pre-processor statements here. Include conditional 684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; compile variables also. 694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#define TRUE 1 714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#define FALSE 0 724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; LOCAL FUNCTION DEFINITIONS 754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Function Prototype declaration 764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; LOCAL VARIABLE DEFINITIONS 804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Variable declaration - defined here and used outside this module 814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* 854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION NAME: Bgn_scd_reset 874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber INPUT AND OUTPUT DEFINITIONS 894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Inputs: 914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber state = points to memory of type Bgn_scdState. 924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Outputs: 944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber The memory of type Bgn_scdState pointed to by state is set to all 954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber zeros. 964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Returns: 984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Returns 0 if memory was successfully initialized, 994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber otherwise returns -1. 1004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Global Variables Used: 1024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None. 1034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Local Variables Needed: 1054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None. 1064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION DESCRIPTION 1094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Resets state memory. 1114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REQUIREMENTS 1144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 1164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REFERENCES 1194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber bgnscd.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 1214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber PSEUDO-CODE 1244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberWord16 Bgn_scd_reset (Bgn_scdState *state) 1264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 1274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (state == (Bgn_scdState *) NULL){ 1284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber fprintf(stderr, "Bgn_scd_reset: invalid parameter\n"); 1294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return -1; 1304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // Static vectors to zero 1334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Set_zero (state->frameEnergyHist, L_ENERGYHIST); 1344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // Initialize hangover handling 1364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber state->bgHangover = 0; 1374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return 0; 1394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 1404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber RESOURCES USED [optional] 1434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber When the code is written for a specific target processor the 1454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber the resources used should be documented below. 1464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber HEAP MEMORY USED: x bytes 1484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber STACK MEMORY USED: x bytes 1504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 1524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber used to represent cycle count for each subroutine 1534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber called) 1544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber where: (cycle count variable) = cycle count for [subroutine 1554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber name] 1564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CAUTION [optional] 1594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber [State any special notes, constraints or cautions for users of this function] 1604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber*/ 1634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberWord16 Bgn_scd_reset(Bgn_scdState *state) 1654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 1664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (state == (Bgn_scdState *) NULL) 1674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* fprintf(stderr, "Bgn_scd_reset: invalid parameter\n"); */ 1694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return(-1); 1704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* Static vectors to zero */ 1734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber memset(state->frameEnergyHist, 0, L_ENERGYHIST*sizeof(Word16)); 1744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* Initialize hangover handling */ 1764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber state->bgHangover = 0; 1774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return(0); 1794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 1804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/****************************************************************************/ 1824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* 1844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION NAME: Bgn_scd 1864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber INPUT AND OUTPUT DEFINITIONS 1884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Inputs: 1904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber st = pointer to state variables of type Bgn_scdState 1914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ltpGainHist[] = LTP gain history (Word16) 1924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber speech[] = synthesis speech frame (Word16) 1934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber voicedHangover = pointer to # of frames after last voiced frame (Word16) 1944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pOverflow = pointer to overflow indicator (Flag) 1954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Outputs: 1974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber st = function updates the state variables of type Bgn_scdState 1984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pointed to by st. 1994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber voicedHangover = function updates the # of frames after last voiced 2004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber frame pointed to by voicedHangover. 2014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pOverflow = 1 if the basic math function L_add() results in saturation. 2024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else pOverflow is zero. 2034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Returns: 2054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber inbgNoise = flag if background noise is present (Word16) 2064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Global Variables Used: 2084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None. 2094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Local Variables Needed: 2114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None. 2124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION DESCRIPTION 2154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Characterize synthesis speech and detect background noise. 2174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REQUIREMENTS 2204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 2224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REFERENCES 2254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber bgnscd.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 2274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber PSEUDO-CODE 2304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberWord16 Bgn_scd (Bgn_scdState *st, // i : State variables for bgn SCD 2324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 ltpGainHist[], // i : LTP gain history 2334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 speech[], // o : synthesis speech frame 2344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *voicedHangover // o : # of frames after last 2354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber voiced frame 2364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ) 2374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 2384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 i; 2394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 prevVoiced, inbgNoise; 2404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 temp; 2414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 ltpLimit, frameEnergyMin; 2424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 currEnergy, noiseFloor, maxEnergy, maxEnergyLastPart; 2434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word32 s; 2444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // Update the inBackgroundNoise flag (valid for use in next frame if BFI) 2464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // it now works as a energy detector floating on top 2474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // not as good as a VAD. 2484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber currEnergy = 0; 2504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s = (Word32) 0; 2514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 0; i < L_FRAME; i++) 2534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s = L_mac (s, speech[i], speech[i]); 2554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s = L_shl(s, 2); 2584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber currEnergy = extract_h (s); 2604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber frameEnergyMin = 32767; 2624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 0; i < L_ENERGYHIST; i++) 2644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (sub(st->frameEnergyHist[i], frameEnergyMin) < 0) 2664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber frameEnergyMin = st->frameEnergyHist[i]; 2674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber noiseFloor = shl (frameEnergyMin, 4); // Frame Energy Margin of 16 2704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber maxEnergy = st->frameEnergyHist[0]; 2724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 1; i < L_ENERGYHIST-4; i++) 2734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if ( sub (maxEnergy, st->frameEnergyHist[i]) < 0) 2754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber maxEnergy = st->frameEnergyHist[i]; 2774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber maxEnergyLastPart = st->frameEnergyHist[2*L_ENERGYHIST/3]; 2814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 2*L_ENERGYHIST/3+1; i < L_ENERGYHIST; i++) 2824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if ( sub (maxEnergyLastPart, st->frameEnergyHist[i] ) < 0) 2844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber maxEnergyLastPart = st->frameEnergyHist[i]; 2864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber inbgNoise = 0; // false 2904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // Do not consider silence as noise 2924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // Do not consider continuous high volume as noise 2934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // Or if the current noise level is very low 2944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // Mark as noise if under current noise limit 2954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // OR if the maximum energy is below the upper limit 2964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if ( (sub(maxEnergy, LOWERNOISELIMIT) > 0) && 2984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber (sub(currEnergy, FRAMEENERGYLIMIT) < 0) && 2994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber (sub(currEnergy, LOWERNOISELIMIT) > 0) && 3004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ( (sub(currEnergy, noiseFloor) < 0) || 3014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber (sub(maxEnergyLastPart, UPPERNOISELIMIT) < 0))) 3024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (sub(add(st->bgHangover, 1), 30) > 0) 3044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber st->bgHangover = 30; 3064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } else 3074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber st->bgHangover = add(st->bgHangover, 1); 3094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 3124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber st->bgHangover = 0; 3144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // make final decision about frame state , act somewhat cautiosly 3174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (sub(st->bgHangover,1) > 0) 3184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber inbgNoise = 1; // true 3194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 0; i < L_ENERGYHIST-1; i++) 3214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber st->frameEnergyHist[i] = st->frameEnergyHist[i+1]; 3234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber st->frameEnergyHist[L_ENERGYHIST-1] = currEnergy; 3254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // prepare for voicing decision; tighten the threshold after some 3274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber time in noise 3284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ltpLimit = 13926; // 0.85 Q14 3294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (sub(st->bgHangover, 8) > 0) 3304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ltpLimit = 15565; // 0.95 Q14 3324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (sub(st->bgHangover, 15) > 0) 3344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ltpLimit = 16383; // 1.00 Q14 3364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber // weak sort of voicing indication. 3394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber prevVoiced = 0; // false 3404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (sub(gmed_n(<pGainHist[4], 5), ltpLimit) > 0) 3424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber prevVoiced = 1; // true 3444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (sub(st->bgHangover, 20) > 0) { 3464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (sub(gmed_n(ltpGainHist, 9), ltpLimit) > 0) 3474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber prevVoiced = 1; // true 3494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 3514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber prevVoiced = 0; // false 3534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (prevVoiced) 3574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *voicedHangover = 0; 3594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 3614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber temp = add(*voicedHangover, 1); 3634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (sub(temp, 10) > 0) 3644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *voicedHangover = 10; 3664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 3684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 3694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *voicedHangover = temp; 3704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 3724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return inbgNoise; 3744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 3754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 3774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber RESOURCES USED [optional] 3784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber When the code is written for a specific target processor the 3804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber the resources used should be documented below. 3814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber HEAP MEMORY USED: x bytes 3834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber STACK MEMORY USED: x bytes 3854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 3874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber used to represent cycle count for each subroutine 3884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber called) 3894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber where: (cycle count variable) = cycle count for [subroutine 3904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber name] 3914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 3934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CAUTION [optional] 3944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber [State any special notes, constraints or cautions for users of this function] 3954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 3974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber*/ 3984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberWord16 Bgn_scd(Bgn_scdState *st, /* i : State variables for bgn SCD */ 4004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 ltpGainHist[], /* i : LTP gain history */ 4014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 speech[], /* o : synthesis speech frame */ 4024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *voicedHangover,/* o : # of frames after last 4034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber voiced frame */ 4044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Flag *pOverflow 4054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ) 4064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 4074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 i; 4084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 prevVoiced, inbgNoise; 4094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 temp; 4104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 ltpLimit, frameEnergyMin; 4114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 currEnergy, noiseFloor, maxEnergy, maxEnergyLastPart; 4124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word32 s, L_temp; 4134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* Update the inBackgroundNoise flag (valid for use in next frame if BFI) */ 4164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* it now works as a energy detector floating on top */ 4174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* not as good as a VAD. */ 4184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s = (Word32) 0; 4204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = L_FRAME - 1; i >= 0; i--) 4224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 4234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_temp = ((Word32) speech[i]) * speech[i]; 4244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (L_temp != (Word32) 0x40000000L) 4254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 4264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_temp = L_temp << 1; 4274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 4284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 4294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 4304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_temp = MAX_32; 4314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 4324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s = L_add(s, L_temp, pOverflow); 4334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 4344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* s is a sum of squares, so don't need to check for neg overflow */ 4364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (s > (Word32)0x1fffffffL) 4374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 4384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber currEnergy = MAX_16; 4394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 4404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 4414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 4424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber currEnergy = (Word16)(s >> 14); 4434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 4444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber frameEnergyMin = 32767; 4464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = L_ENERGYHIST - 1; i >= 0; i--) 4474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 4484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (st->frameEnergyHist[i] < frameEnergyMin) 4494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 4504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber frameEnergyMin = st->frameEnergyHist[i]; 4514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 4524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 4534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* Frame Energy Margin of 16 */ 4554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_temp = (Word32)frameEnergyMin << 4; 4564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (L_temp != (Word32)((Word16) L_temp)) 4574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 4584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (L_temp > 0) 4594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 4604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber noiseFloor = MAX_16; 4614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 4624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 4634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 4644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber noiseFloor = MIN_16; 4654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 4664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 4674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 4684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 4694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber noiseFloor = (Word16)(L_temp); 4704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 4714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber maxEnergy = st->frameEnergyHist[0]; 4734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = L_ENERGYHIST - 5; i >= 1; i--) 4744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 4754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (maxEnergy < st->frameEnergyHist[i]) 4764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 4774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber maxEnergy = st->frameEnergyHist[i]; 4784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 4794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 4804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber maxEnergyLastPart = st->frameEnergyHist[2*L_ENERGYHIST/3]; 4824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 2 * L_ENERGYHIST / 3 + 1; i < L_ENERGYHIST; i++) 4834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 4844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (maxEnergyLastPart < st->frameEnergyHist[i]) 4854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 4864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber maxEnergyLastPart = st->frameEnergyHist[i]; 4874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 4884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 4894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* Do not consider silence as noise */ 4914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* Do not consider continuous high volume as noise */ 4924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* Or if the current noise level is very low */ 4934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* Mark as noise if under current noise limit */ 4944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* OR if the maximum energy is below the upper limit */ 4954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if ((maxEnergy > LOWERNOISELIMIT) && 4974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber (currEnergy < FRAMEENERGYLIMIT) && 4984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber (currEnergy > LOWERNOISELIMIT) && 4994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ((currEnergy < noiseFloor) || 5004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber (maxEnergyLastPart < UPPERNOISELIMIT))) 5014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if ((st->bgHangover + 1) > 30) 5034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber st->bgHangover = 30; 5054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 5074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber st->bgHangover += 1; 5094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 5124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber st->bgHangover = 0; 5144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 5164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* make final decision about frame state , act somewhat cautiosly */ 5174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 5184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (st->bgHangover > 1) 5194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber inbgNoise = TRUE; 5214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 5234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber inbgNoise = FALSE; 5254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 5274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 0; i < L_ENERGYHIST - 1; i++) 5284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber st->frameEnergyHist[i] = st->frameEnergyHist[i+1]; 5304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber st->frameEnergyHist[L_ENERGYHIST-1] = currEnergy; 5324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 5334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* prepare for voicing decision; tighten the threshold after some 5344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber time in noise */ 5354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 5364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (st->bgHangover > 15) 5374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ltpLimit = 16383; /* 1.00 Q14 */ 5394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else if (st->bgHangover > 8) 5414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ltpLimit = 15565; /* 0.95 Q14 */ 5434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 5454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ltpLimit = 13926; /* 0.85 Q14 */ 5474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 5494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* weak sort of voicing indication. */ 5504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber prevVoiced = FALSE; 5514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 5524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (gmed_n(<pGainHist[4], 5) > ltpLimit) 5534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber prevVoiced = TRUE; 5554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 5574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (st->bgHangover > 20) 5584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (gmed_n(ltpGainHist, 9) > ltpLimit) 5604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber prevVoiced = TRUE; 5624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 5644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber prevVoiced = FALSE; 5664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 5694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 5704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (prevVoiced) 5714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *voicedHangover = 0; 5734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 5754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber temp = *voicedHangover + 1; 5774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 5784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (temp > 10) 5794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *voicedHangover = 10; 5814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 5834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 5844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *voicedHangover = temp; 5854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 5874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 5884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return(inbgNoise); 5894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 590