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annotate libtwamr/cnst_vad.h @ 468:4104b0390fab

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author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 13 May 2024 07:21:09 +0000
parents 8847c1740e78
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1 /*
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2 ********************************************************************************
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3 **-------------------------------------------------------------------------**
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4 ** **
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5 ** GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001 **
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6 ** R99 Version 3.3.0 **
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7 ** REL-4 Version 4.1.0 **
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8 ** **
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9 **-------------------------------------------------------------------------**
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10 ********************************************************************************
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11 *
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12 * File : cnst_vad.h
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13 * Purpose : Constants and definitions for VAD
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14 *
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15 ********************************************************************************
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16 */
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17 #ifndef cnst_vad_h
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18 #define cnst_vad_h "$Id $"
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19
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20 #define FRAME_LEN 160 /* Length (samples) of the input frame */
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21 #define COMPLEN 9 /* Number of sub-bands used by VAD */
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22 #define INV_COMPLEN 3641 /* 1.0/COMPLEN*2^15 */
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23 #define LOOKAHEAD 40 /* length of the lookahead used by speech coder */
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24
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25 #define UNITY 512 /* Scaling used with SNR calculation */
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26 #define UNIRSHFT 6 /* = log2(MAX_16/UNITY) */
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27
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28 #define TONE_THR (Word16)(0.65*MAX_16) /* Threshold for tone detection */
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29
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30 /* Constants for background spectrum update */
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31 #define ALPHA_UP1 (Word16)((1.0 - 0.95)*MAX_16) /* Normal update, upwards: */
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32 #define ALPHA_DOWN1 (Word16)((1.0 - 0.936)*MAX_16) /* Normal update, downwards */
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33 #define ALPHA_UP2 (Word16)((1.0 - 0.985)*MAX_16) /* Forced update, upwards */
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34 #define ALPHA_DOWN2 (Word16)((1.0 - 0.943)*MAX_16) /* Forced update, downwards */
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35 #define ALPHA3 (Word16)((1.0 - 0.95)*MAX_16) /* Update downwards */
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36 #define ALPHA4 (Word16)((1.0 - 0.9)*MAX_16) /* For stationary estimation */
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37 #define ALPHA5 (Word16)((1.0 - 0.5)*MAX_16) /* For stationary estimation */
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38
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39 /* Constants for VAD threshold */
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40 #define VAD_THR_HIGH 1260 /* Highest threshold */
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41 #define VAD_THR_LOW 720 /* Lowest threshold */
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42 #define VAD_P1 0 /* Noise level for highest threshold */
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43 #define VAD_P2 6300 /* Noise level for lowest threshold */
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44 #define VAD_SLOPE (Word16)(MAX_16*(float)(VAD_THR_LOW-VAD_THR_HIGH)/(float)(VAD_P2-VAD_P1))
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45
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46 /* Parameters for background spectrum recovery function */
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47 #define STAT_COUNT 20 /* threshold of stationary detection counter */
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48 #define STAT_COUNT_BY_2 10 /* threshold of stationary detection counter */
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49 #define CAD_MIN_STAT_COUNT 5 /* threshold of stationary detection counter */
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50
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51 #define STAT_THR_LEVEL 184 /* Threshold level for stationarity detection */
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52 #define STAT_THR 1000 /* Threshold for stationarity detection */
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53
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54 /* Limits for background noise estimate */
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55 #define NOISE_MIN 40 /* minimum */
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56 #define NOISE_MAX 16000 /* maximum */
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57 #define NOISE_INIT 150 /* initial */
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58
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59 /* Constants for VAD hangover addition */
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60 #define HANG_NOISE_THR 100
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61 #define BURST_LEN_HIGH_NOISE 4
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62 #define HANG_LEN_HIGH_NOISE 7
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63 #define BURST_LEN_LOW_NOISE 5
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64 #define HANG_LEN_LOW_NOISE 4
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65
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66 /* Thresholds for signal power */
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67 #define VAD_POW_LOW (Word32)15000 /* If input power is lower, */
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68 /* VAD is set to 0 */
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69 #define POW_PITCH_THR (Word32)343040 /* If input power is lower, pitch */
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70 /* detection is ignored */
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71
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72 #define POW_COMPLEX_THR (Word32)15000 /* If input power is lower, complex */
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73 /* flags value for previous frame is un-set */
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74
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75
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76 /* Constants for the filter bank */
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77 #define LEVEL_SHIFT 0 /* scaling */
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78 #define COEFF3 13363 /* coefficient for the 3rd order filter */
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79 #define COEFF5_1 21955 /* 1st coefficient the for 5th order filter */
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80 #define COEFF5_2 6390 /* 2nd coefficient the for 5th order filter */
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81
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82 /* Constants for pitch detection */
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83 #define LTHRESH 4
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84 #define NTHRESH 4
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85
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86 /* Constants for complex signal VAD */
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87 #define CVAD_THRESH_ADAPT_HIGH (Word16)(0.6 * MAX_16) /* threshold for adapt stopping high */
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88 #define CVAD_THRESH_ADAPT_LOW (Word16)(0.5 * MAX_16) /* threshold for adapt stopping low */
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89 #define CVAD_THRESH_IN_NOISE (Word16)(0.65 * MAX_16) /* threshold going into speech on
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90 a short term basis */
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91
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92 #define CVAD_THRESH_HANG (Word16)(0.70 * MAX_16) /* threshold */
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93 #define CVAD_HANG_LIMIT (Word16)(100) /* 2 second estimation time */
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94 #define CVAD_HANG_LENGTH (Word16)(250) /* 5 second hangover */
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95
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96 #define CVAD_LOWPOW_RESET (Word16) (0.40 * MAX_16) /* init in low power segment */
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97 #define CVAD_MIN_CORR (Word16) (0.40 * MAX_16) /* lowest adaptation value */
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98
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99 #define CVAD_BURST 20 /* speech burst length for speech reset */
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100 #define CVAD_ADAPT_SLOW (Word16)(( 1.0 - 0.98) * MAX_16) /* threshold for slow adaption */
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101 #define CVAD_ADAPT_FAST (Word16)((1.0 - 0.92) * MAX_16) /* threshold for fast adaption */
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102 #define CVAD_ADAPT_REALLY_FAST (Word16)((1.0 - 0.80) * MAX_16) /* threshold for really fast
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103 adaption */
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104
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105 #endif