1 /* 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 /* 12 * This file includes the constant values used internally in VAD. 13 */ 14 15 #include "vad_const.h" 16 17 // Spectrum Weighting 18 const WebRtc_Word16 kSpectrumWeight[6] = {6, 8, 10, 12, 14, 16}; 19 20 const WebRtc_Word16 kCompVar = 22005; 21 22 // Constant 160*log10(2) in Q9 23 const WebRtc_Word16 kLogConst = 24660; 24 25 // Constant log2(exp(1)) in Q12 26 const WebRtc_Word16 kLog10Const = 5909; 27 28 // Q15 29 const WebRtc_Word16 kNoiseUpdateConst = 655; 30 const WebRtc_Word16 kSpeechUpdateConst = 6554; 31 32 // Q8 33 const WebRtc_Word16 kBackEta = 154; 34 35 // Coefficients used by WebRtcVad_HpOutput, Q14 36 const WebRtc_Word16 kHpZeroCoefs[3] = {6631, -13262, 6631}; 37 const WebRtc_Word16 kHpPoleCoefs[3] = {16384, -7756, 5620}; 38 39 // Allpass filter coefficients, upper and lower, in Q15 40 // Upper: 0.64, Lower: 0.17 41 const WebRtc_Word16 kAllPassCoefsQ15[2] = {20972, 5571}; 42 const WebRtc_Word16 kAllPassCoefsQ13[2] = {5243, 1392}; // Q13 43 44 // Minimum difference between the two models, Q5 45 const WebRtc_Word16 kMinimumDifference[6] = {544, 544, 576, 576, 576, 576}; 46 47 // Upper limit of mean value for speech model, Q7 48 const WebRtc_Word16 kMaximumSpeech[6] = {11392, 11392, 11520, 11520, 11520, 11520}; 49 50 // Minimum value for mean value 51 const WebRtc_Word16 kMinimumMean[2] = {640, 768}; 52 53 // Upper limit of mean value for noise model, Q7 54 const WebRtc_Word16 kMaximumNoise[6] = {9216, 9088, 8960, 8832, 8704, 8576}; 55 56 // Adjustment for division with two in WebRtcVad_SplitFilter 57 const WebRtc_Word16 kOffsetVector[6] = {368, 368, 272, 176, 176, 176}; 58 59 // Start values for the Gaussian models, Q7 60 // Weights for the two Gaussians for the six channels (noise) 61 const WebRtc_Word16 kNoiseDataWeights[12] = {34, 62, 72, 66, 53, 25, 94, 66, 56, 62, 75, 103}; 62 63 // Weights for the two Gaussians for the six channels (speech) 64 const WebRtc_Word16 kSpeechDataWeights[12] = {48, 82, 45, 87, 50, 47, 80, 46, 83, 41, 78, 81}; 65 66 // Means for the two Gaussians for the six channels (noise) 67 const WebRtc_Word16 kNoiseDataMeans[12] = {6738, 4892, 7065, 6715, 6771, 3369, 7646, 3863, 68 7820, 7266, 5020, 4362}; 69 70 // Means for the two Gaussians for the six channels (speech) 71 const WebRtc_Word16 kSpeechDataMeans[12] = {8306, 10085, 10078, 11823, 11843, 6309, 9473, 72 9571, 10879, 7581, 8180, 7483}; 73 74 // Stds for the two Gaussians for the six channels (noise) 75 const WebRtc_Word16 kNoiseDataStds[12] = {378, 1064, 493, 582, 688, 593, 474, 697, 475, 688, 76 421, 455}; 77 78 // Stds for the two Gaussians for the six channels (speech) 79 const WebRtc_Word16 kSpeechDataStds[12] = {555, 505, 567, 524, 585, 1231, 509, 828, 492, 1540, 80 1079, 850}; 81
