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/*
** Copyright 2003-2010, VisualOn, Inc.
**
** 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.
*/
/*-------------------------------------------------------------------*
* WB_VAD_C.H *
*-------------------------------------------------------------------*
* Constants for Voice Activity Detection. *
*-------------------------------------------------------------------*/
#ifndef __WB_VAD_C_H__
#define __WB_VAD_C_H__
#define FRAME_LEN 256 /* Length (samples) of the input frame */
#define COMPLEN 12 /* Number of sub-bands used by VAD */
#define UNIRSHFT 7 /* = log2(MAX_16/UNITY), UNITY = 256 */
#define SCALE 128 /* (UNITY*UNITY)/512 */
#define TONE_THR (Word16)(0.65*MAX_16) /* Threshold for tone detection */
/* constants for speech level estimation */
#define SP_EST_COUNT 80
#define SP_ACTIVITY_COUNT 25
#define ALPHA_SP_UP (Word16)((1.0 - 0.85)*MAX_16)
#define ALPHA_SP_DOWN (Word16)((1.0 - 0.85)*MAX_16)
#define NOM_LEVEL 2050 /* about -26 dBov Q15 */
#define SPEECH_LEVEL_INIT NOM_LEVEL /* initial speech level */
#define MIN_SPEECH_LEVEL1 (Word16)(NOM_LEVEL * 0.063) /* NOM_LEVEL -24 dB */
#define MIN_SPEECH_LEVEL2 (Word16)(NOM_LEVEL * 0.2) /* NOM_LEVEL -14 dB */
#define MIN_SPEECH_SNR 4096 /* 0 dB, lowest SNR estimation, Q12 */
/* Time 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 THR_MIN (Word16)(1.6*SCALE) /* Minimum threshold */
#define THR_HIGH (Word16)(6*SCALE) /* Highest threshold */
#define THR_LOW (Word16)(1.7*SCALE) /* Lowest threshold */
#define NO_P1 31744 /* ilog2(1), Noise level for highest threshold */
#define NO_P2 19786 /* ilog2(0.1*MAX_16), Noise level for lowest threshold */
#define NO_SLOPE (Word16)(MAX_16*(float)(THR_LOW-THR_HIGH)/(float)(NO_P2-NO_P1))
#define SP_CH_MIN (Word16)(-0.75*SCALE)
#define SP_CH_MAX (Word16)(0.75*SCALE)
#define SP_P1 22527 /* ilog2(NOM_LEVEL/4) */
#define SP_P2 17832 /* ilog2(NOM_LEVEL*4) */
#define SP_SLOPE (Word16)(MAX_16*(float)(SP_CH_MAX-SP_CH_MIN)/(float)(SP_P2-SP_P1))
/* Constants for hangover length */
#define HANG_HIGH 12 /* longest hangover */
#define HANG_LOW 2 /* shortest hangover */
#define HANG_P1 THR_LOW /* threshold for longest hangover */
#define HANG_P2 (Word16)(4*SCALE) /* threshold for shortest hangover */
#define HANG_SLOPE (Word16)(MAX_16*(float)(HANG_LOW-HANG_HIGH)/(float)(HANG_P2-HANG_P1))
/* Constants for burst length */
#define BURST_HIGH 8 /* longest burst length */
#define BURST_LOW 3 /* shortest burst length */
#define BURST_P1 THR_HIGH /* threshold for longest burst */
#define BURST_P2 THR_LOW /* threshold for shortest burst */
#define BURST_SLOPE (Word16)(MAX_16*(float)(BURST_LOW-BURST_HIGH)/(float)(BURST_P2-BURST_P1))
/* Parameters for background spectrum recovery function */
#define STAT_COUNT 20 /* 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 20000 /* maximum */
#define NOISE_INIT 150 /* initial */
/* Thresholds for signal power (now calculated on 2 frames) */
#define VAD_POW_LOW (Word32)30000L /* If input power is lower than this, VAD is set to 0 */
#define POW_TONE_THR (Word32)686080L /* If input power is lower,tone detection flag is ignored */
/* Constants for the filter bank */
#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 */
#define F_5TH_CNT 5 /* number of 5th order filters */
#define F_3TH_CNT 6 /* number of 3th order filters */
#endif //__WB_VAD_C_H__
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