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comparison libtwamr/cnst_vad.h @ 408:8847c1740e78

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libtwamr: integrate VAD1
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 07 May 2024 00:56:10 +0000
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407:5a1d18542f8a 408:8847c1740e78
1 /*
2 ********************************************************************************
3 **-------------------------------------------------------------------------**
4 ** **
5 ** GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001 **
6 ** R99 Version 3.3.0 **
7 ** REL-4 Version 4.1.0 **
8 ** **
9 **-------------------------------------------------------------------------**
10 ********************************************************************************
11 *
12 * File : cnst_vad.h
13 * Purpose : Constants and definitions for VAD
14 *
15 ********************************************************************************
16 */
17 #ifndef cnst_vad_h
18 #define cnst_vad_h "$Id $"
19
20 #define FRAME_LEN 160 /* Length (samples) of the input frame */
21 #define COMPLEN 9 /* Number of sub-bands used by VAD */
22 #define INV_COMPLEN 3641 /* 1.0/COMPLEN*2^15 */
23 #define LOOKAHEAD 40 /* length of the lookahead used by speech coder */
24
25 #define UNITY 512 /* Scaling used with SNR calculation */
26 #define UNIRSHFT 6 /* = log2(MAX_16/UNITY) */
27
28 #define TONE_THR (Word16)(0.65*MAX_16) /* Threshold for tone detection */
29
30 /* Constants for background spectrum update */
31 #define ALPHA_UP1 (Word16)((1.0 - 0.95)*MAX_16) /* Normal update, upwards: */
32 #define ALPHA_DOWN1 (Word16)((1.0 - 0.936)*MAX_16) /* Normal update, downwards */
33 #define ALPHA_UP2 (Word16)((1.0 - 0.985)*MAX_16) /* Forced update, upwards */
34 #define ALPHA_DOWN2 (Word16)((1.0 - 0.943)*MAX_16) /* Forced update, downwards */
35 #define ALPHA3 (Word16)((1.0 - 0.95)*MAX_16) /* Update downwards */
36 #define ALPHA4 (Word16)((1.0 - 0.9)*MAX_16) /* For stationary estimation */
37 #define ALPHA5 (Word16)((1.0 - 0.5)*MAX_16) /* For stationary estimation */
38
39 /* Constants for VAD threshold */
40 #define VAD_THR_HIGH 1260 /* Highest threshold */
41 #define VAD_THR_LOW 720 /* Lowest threshold */
42 #define VAD_P1 0 /* Noise level for highest threshold */
43 #define VAD_P2 6300 /* Noise level for lowest threshold */
44 #define VAD_SLOPE (Word16)(MAX_16*(float)(VAD_THR_LOW-VAD_THR_HIGH)/(float)(VAD_P2-VAD_P1))
45
46 /* Parameters for background spectrum recovery function */
47 #define STAT_COUNT 20 /* threshold of stationary detection counter */
48 #define STAT_COUNT_BY_2 10 /* threshold of stationary detection counter */
49 #define CAD_MIN_STAT_COUNT 5 /* threshold of stationary detection counter */
50
51 #define STAT_THR_LEVEL 184 /* Threshold level for stationarity detection */
52 #define STAT_THR 1000 /* Threshold for stationarity detection */
53
54 /* Limits for background noise estimate */
55 #define NOISE_MIN 40 /* minimum */
56 #define NOISE_MAX 16000 /* maximum */
57 #define NOISE_INIT 150 /* initial */
58
59 /* Constants for VAD hangover addition */
60 #define HANG_NOISE_THR 100
61 #define BURST_LEN_HIGH_NOISE 4
62 #define HANG_LEN_HIGH_NOISE 7
63 #define BURST_LEN_LOW_NOISE 5
64 #define HANG_LEN_LOW_NOISE 4
65
66 /* Thresholds for signal power */
67 #define VAD_POW_LOW (Word32)15000 /* If input power is lower, */
68 /* VAD is set to 0 */
69 #define POW_PITCH_THR (Word32)343040 /* If input power is lower, pitch */
70 /* detection is ignored */
71
72 #define POW_COMPLEX_THR (Word32)15000 /* If input power is lower, complex */
73 /* flags value for previous frame is un-set */
74
75
76 /* Constants for the filter bank */
77 #define LEVEL_SHIFT 0 /* scaling */
78 #define COEFF3 13363 /* coefficient for the 3rd order filter */
79 #define COEFF5_1 21955 /* 1st coefficient the for 5th order filter */
80 #define COEFF5_2 6390 /* 2nd coefficient the for 5th order filter */
81
82 /* Constants for pitch detection */
83 #define LTHRESH 4
84 #define NTHRESH 4
85
86 /* Constants for complex signal VAD */
87 #define CVAD_THRESH_ADAPT_HIGH (Word16)(0.6 * MAX_16) /* threshold for adapt stopping high */
88 #define CVAD_THRESH_ADAPT_LOW (Word16)(0.5 * MAX_16) /* threshold for adapt stopping low */
89 #define CVAD_THRESH_IN_NOISE (Word16)(0.65 * MAX_16) /* threshold going into speech on
90 a short term basis */
91
92 #define CVAD_THRESH_HANG (Word16)(0.70 * MAX_16) /* threshold */
93 #define CVAD_HANG_LIMIT (Word16)(100) /* 2 second estimation time */
94 #define CVAD_HANG_LENGTH (Word16)(250) /* 5 second hangover */
95
96 #define CVAD_LOWPOW_RESET (Word16) (0.40 * MAX_16) /* init in low power segment */
97 #define CVAD_MIN_CORR (Word16) (0.40 * MAX_16) /* lowest adaptation value */
98
99 #define CVAD_BURST 20 /* speech burst length for speech reset */
100 #define CVAD_ADAPT_SLOW (Word16)(( 1.0 - 0.98) * MAX_16) /* threshold for slow adaption */
101 #define CVAD_ADAPT_FAST (Word16)((1.0 - 0.92) * MAX_16) /* threshold for fast adaption */
102 #define CVAD_ADAPT_REALLY_FAST (Word16)((1.0 - 0.80) * MAX_16) /* threshold for really fast
103 adaption */
104
105 #endif