| /* ------------------------------------------------------------------ |
| * Copyright (C) 1998-2009 PacketVideo |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either |
| * express or implied. |
| * See the License for the specific language governing permissions |
| * and limitations under the License. |
| * ------------------------------------------------------------------- |
| */ |
| /**************************************************************************************** |
| Portions of this file are derived from the following 3GPP standard: |
| |
| 3GPP TS 26.073 |
| ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec |
| Available from http://www.3gpp.org |
| |
| (C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) |
| Permission to distribute, modify and use this file under the standard license |
| terms listed above has been obtained from the copyright holder. |
| ****************************************************************************************/ |
| /* |
| ******************************************************************************** |
| **-------------------------------------------------------------------------** |
| ** ** |
| ** GSM AMR-NB speech codec R98 Version 7.5.0 March 2, 2001 ** |
| ** R99 Version 3.2.0 ** |
| ** REL-4 Version 4.0.0 ** |
| ** ** |
| **-------------------------------------------------------------------------** |
| ******************************************************************************** |
| * |
| * File : cnst_vad.h |
| * Purpose : Constants and definitions for VAD |
| * |
| ******************************************************************************** |
| */ |
| #ifndef cnst_vad_h |
| #define cnst_vad_h "$Id $" |
| |
| #define FRAME_LEN 160 /* Length (samples) of the input frame */ |
| #define COMPLEN 9 /* Number of sub-bands used by VAD */ |
| #define INV_COMPLEN 3641 /* 1.0/COMPLEN*2^15 */ |
| #define LOOKAHEAD 40 /* length of the lookahead used by speech coder */ |
| |
| #define UNITY 512 /* Scaling used with SNR calculation */ |
| #define UNIRSHFT 6 /* = log2(MAX_16/UNITY) */ |
| |
| #define TONE_THR (Word16)(0.65*MAX_16) /* Threshold for tone detection */ |
| |
| /* Constants for background spectrum update */ |
| #define ALPHA_UP1 (Word16)((1.0 - 0.95)*MAX_16) /* Normal update, upwards: */ |
| #define ALPHA_DOWN1 (Word16)((1.0 - 0.936)*MAX_16) /* Normal update, downwards */ |
| #define ALPHA_UP2 (Word16)((1.0 - 0.985)*MAX_16) /* Forced update, upwards */ |
| #define ALPHA_DOWN2 (Word16)((1.0 - 0.943)*MAX_16) /* Forced update, downwards */ |
| #define ALPHA3 (Word16)((1.0 - 0.95)*MAX_16) /* Update downwards */ |
| #define ALPHA4 (Word16)((1.0 - 0.9)*MAX_16) /* For stationary estimation */ |
| #define ALPHA5 (Word16)((1.0 - 0.5)*MAX_16) /* For stationary estimation */ |
| |
| /* Constants for VAD threshold */ |
| #define VAD_THR_HIGH 1260 /* Highest threshold */ |
| #define VAD_THR_LOW 720 /* Lowest threshold */ |
| #define VAD_P1 0 /* Noise level for highest threshold */ |
| #define VAD_P2 6300 /* Noise level for lowest threshold */ |
| #define VAD_SLOPE (Word16)(MAX_16*(float)(VAD_THR_LOW-VAD_THR_HIGH)/(float)(VAD_P2-VAD_P1)) |
| |
| /* Parameters for background spectrum recovery function */ |
| #define STAT_COUNT 20 /* threshold of stationary detection counter */ |
| #define STAT_COUNT_BY_2 10 /* threshold of stationary detection counter */ |
| #define CAD_MIN_STAT_COUNT 5 /* threshold of stationary detection counter */ |
| |
| #define STAT_THR_LEVEL 184 /* Threshold level for stationarity detection */ |
| #define STAT_THR 1000 /* Threshold for stationarity detection */ |
| |
| /* Limits for background noise estimate */ |
| #define NOISE_MIN 40 /* minimum */ |
| #define NOISE_MAX 16000 /* maximum */ |
| #define NOISE_INIT 150 /* initial */ |
| |
| /* Constants for VAD hangover addition */ |
| #define HANG_NOISE_THR 100 |
| #define BURST_LEN_HIGH_NOISE 4 |
| #define HANG_LEN_HIGH_NOISE 7 |
| #define BURST_LEN_LOW_NOISE 5 |
| #define HANG_LEN_LOW_NOISE 4 |
| |
| /* Thresholds for signal power */ |
| #define VAD_POW_LOW (Word32)15000 /* If input power is lower, */ |
| /* VAD is set to 0 */ |
| #define POW_PITCH_THR (Word32)343040 /* If input power is lower, pitch */ |
| /* detection is ignored */ |
| |
| #define POW_COMPLEX_THR (Word32)15000 /* If input power is lower, complex */ |
| /* flags value for previous frame is un-set */ |
| |
| |
| /* Constants for the filter bank */ |
| #define LEVEL_SHIFT 0 /* scaling */ |
| #define COEFF3 13363 /* coefficient for the 3rd order filter */ |
| #define COEFF5_1 21955 /* 1st coefficient the for 5th order filter */ |
| #define COEFF5_2 6390 /* 2nd coefficient the for 5th order filter */ |
| |
| /* Constants for pitch detection */ |
| #define LTHRESH 4 |
| #define NTHRESH 4 |
| |
| /* Constants for complex signal VAD */ |
| #define CVAD_THRESH_ADAPT_HIGH (Word16)(0.6 * MAX_16) /* threshold for adapt stopping high */ |
| #define CVAD_THRESH_ADAPT_LOW (Word16)(0.5 * MAX_16) /* threshold for adapt stopping low */ |
| #define CVAD_THRESH_IN_NOISE (Word16)(0.65 * MAX_16) /* threshold going into speech on */ |
| /* a short term basis */ |
| |
| #define CVAD_THRESH_HANG (Word16)(0.70 * MAX_16) /* threshold */ |
| #define CVAD_HANG_LIMIT (Word16)(100) /* 2 second estimation time */ |
| #define CVAD_HANG_LENGTH (Word16)(250) /* 5 second hangover */ |
| |
| #define CVAD_LOWPOW_RESET (Word16) (0.40 * MAX_16) /* init in low power segment */ |
| #define CVAD_MIN_CORR (Word16) (0.40 * MAX_16) /* lowest adaptation value */ |
| |
| #define CVAD_BURST 20 /* speech burst length for speech reset */ |
| #define CVAD_ADAPT_SLOW (Word16)(( 1.0 - 0.98) * MAX_16) /* threshold for slow adaption */ |
| #define CVAD_ADAPT_FAST (Word16)((1.0 - 0.92) * MAX_16) /* threshold for fast adaption */ |
| #define CVAD_ADAPT_REALLY_FAST (Word16)((1.0 - 0.80) * MAX_16) /* threshold for really fast */ |
| /* adaption */ |
| |
| #endif |
