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 * SWB16_KLT_Tables.c 13 * 14 * This file defines tables used for entropy coding of LPC shape of 15 * upper-band signal if the bandwidth is 16 kHz. 16 * 17 */ 18 19 #include "lpc_shape_swb16_tables.h" 20 #include "settings.h" 21 #include "typedefs.h" 22 23 /* 24 * Mean value of LAR 25 */ 26 const double WebRtcIsac_kMeanLarUb16[UB_LPC_ORDER] = 27 { 28 0.454978, 0.364747, 0.102999, 0.104523 29 }; 30 31 /* 32 * A rotation matrix to decorrelate intra-vector correlation, 33 * i.e. correlation among components of LAR vector. 34 */ 35 const double WebRtcIsac_kIintraVecDecorrMatUb16[UB_LPC_ORDER][UB_LPC_ORDER] = 36 { 37 {-0.020528, -0.085858, -0.002431, 0.996093}, 38 {-0.033155, 0.036102, 0.998786, 0.004866}, 39 { 0.202627, 0.974853, -0.028940, 0.088132}, 40 {-0.978479, 0.202454, -0.039785, -0.002811} 41 }; 42 43 /* 44 * A rotation matrix to remove correlation among LAR coefficients 45 * of different LAR vectors. One might guess that decorrelation matrix 46 * for the first component should differ from the second component 47 * but we haven't observed a significant benefit of having different 48 * decorrelation matrices for different components. 49 */ 50 const double WebRtcIsac_kInterVecDecorrMatUb16 51 [UB16_LPC_VEC_PER_FRAME][UB16_LPC_VEC_PER_FRAME] = 52 { 53 { 0.291675, -0.515786, 0.644927, 0.482658}, 54 {-0.647220, 0.479712, 0.289556, 0.516856}, 55 { 0.643084, 0.485489, -0.289307, 0.516763}, 56 {-0.287185, -0.517823, -0.645389, 0.482553} 57 }; 58 59 /* 60 * The following 16 vectors define CDF of 16 decorrelated LAR 61 * coefficients. 62 */ 63 const WebRtc_UWord16 WebRtcIsac_kLpcShapeCdfVec01Ub16[14] = 64 { 65 0, 2, 20, 159, 1034, 5688, 20892, 44653, 66 59849, 64485, 65383, 65518, 65534, 65535 67 }; 68 69 const WebRtc_UWord16 WebRtcIsac_kLpcShapeCdfVec1Ub16[16] = 70 { 71 0, 1, 7, 43, 276, 1496, 6681, 21653, 72 43891, 58859, 64022, 65248, 65489, 65529, 65534, 65535 73 }; 74 75 const WebRtc_UWord16 WebRtcIsac_kLpcShapeCdfVec2Ub16[18] = 76 { 77 0, 1, 9, 54, 238, 933, 3192, 9461, 78 23226, 42146, 56138, 62413, 64623, 65300, 65473, 65521, 79 65533, 65535 80 }; 81 82 const WebRtc_UWord16 WebRtcIsac_kLpcShapeCdfVec3Ub16[30] = 83 { 84 0, 2, 4, 8, 17, 36, 75, 155, 85 329, 683, 1376, 2662, 5047, 9508, 17526, 29027, 86 40363, 48997, 55096, 59180, 61789, 63407, 64400, 64967, 87 65273, 65429, 65497, 65526, 65534, 65535 88 }; 89 90 const WebRtc_UWord16 WebRtcIsac_kLpcShapeCdfVec4Ub16[16] = 91 { 92 0, 1, 10, 63, 361, 1785, 7407, 22242, 93 43337, 58125, 63729, 65181, 65472, 65527, 65534, 65535 94 }; 95 96 const WebRtc_UWord16 WebRtcIsac_kLpcShapeCdfVec5Ub16[17] = 97 { 98 0, 1, 7, 29, 134, 599, 2443, 8590, 99 22962, 42635, 56911, 63060, 64940, 65408, 65513, 65531, 100 65535 101 }; 102 103 const WebRtc_UWord16 WebRtcIsac_kLpcShapeCdfVec6Ub16[21] = 104 { 105 0, 1, 5, 16, 57, 191, 611, 1808, 106 4847, 11755, 24612, 40910, 53789, 60698, 63729, 64924, 107 65346, 65486, 65523, 65532, 65535 108 }; 109 110 const WebRtc_UWord16 WebRtcIsac_kLpcShapeCdfVec7Ub16[36] = 111 { 112 0, 1, 4, 12, 25, 55, 104, 184, 113 314, 539, 926, 1550, 2479, 3861, 5892, 8845, 114 13281, 20018, 29019, 38029, 45581, 51557, 56057, 59284, 115 61517, 63047, 64030, 64648, 65031, 65261, 65402, 65480, 116 65518, 65530, 65534, 65535 117 }; 118 119 const WebRtc_UWord16 WebRtcIsac_kLpcShapeCdfVec8Ub16[21] = 120 { 121 0, 1, 2, 7, 26, 103, 351, 1149, 122 3583, 10204, 23846, 41711, 55361, 61917, 64382, 65186, 123 65433, 65506, 65528, 65534, 65535 124 }; 125 126 const WebRtc_UWord16 WebRtcIsac_kLpcShapeCdfVec01Ub160[21] = 127 { 128 0, 6, 19, 63, 205, 638, 1799, 4784, 129 11721, 24494, 40803, 53805, 60886, 63822, 64931, 65333, 130 65472, 65517, 65530, 65533, 65535 131 }; 132 133 const WebRtc_UWord16 WebRtcIsac_kLpcShapeCdfVec01Ub161[28] = 134 { 135 0, 1, 3, 11, 31, 86, 221, 506, 136 1101, 2296, 4486, 8477, 15356, 26079, 38941, 49952, 137 57165, 61257, 63426, 64549, 65097, 65351, 65463, 65510, 138 65526, 65532, 65534, 65535 139 }; 140 141 const WebRtc_UWord16 WebRtcIsac_kLpcShapeCdfVec01Ub162[55] = 142 { 143 0, 3, 12, 23, 42, 65, 89, 115, 144 150, 195, 248, 327, 430, 580, 784, 1099, 145 1586, 2358, 3651, 5899, 9568, 14312, 19158, 23776, 146 28267, 32663, 36991, 41153, 45098, 48680, 51870, 54729, 147 57141, 59158, 60772, 62029, 63000, 63761, 64322, 64728, 148 65000, 65192, 65321, 65411, 65463, 65496, 65514, 65523, 149 65527, 65529, 65531, 65532, 65533, 65534, 65535 150 }; 151 152 const WebRtc_UWord16 WebRtcIsac_kLpcShapeCdfVec01Ub163[26] = 153 { 154 0, 2, 4, 10, 21, 48, 114, 280, 155 701, 1765, 4555, 11270, 24267, 41213, 54285, 61003, 156 63767, 64840, 65254, 65421, 65489, 65514, 65526, 65532, 157 65534, 65535 158 }; 159 160 const WebRtc_UWord16 WebRtcIsac_kLpcShapeCdfVec01Ub164[28] = 161 { 162 0, 1, 3, 6, 15, 36, 82, 196, 163 453, 1087, 2557, 5923, 13016, 25366, 40449, 52582, 164 59539, 62896, 64389, 65033, 65316, 65442, 65494, 65519, 165 65529, 65533, 65534, 65535 166 }; 167 168 const WebRtc_UWord16 WebRtcIsac_kLpcShapeCdfVec01Ub165[34] = 169 { 170 0, 2, 4, 8, 18, 35, 73, 146, 171 279, 524, 980, 1789, 3235, 5784, 10040, 16998, 172 27070, 38543, 48499, 55421, 59712, 62257, 63748, 64591, 173 65041, 65278, 65410, 65474, 65508, 65522, 65530, 65533, 174 65534, 65535 175 }; 176 177 const WebRtc_UWord16 WebRtcIsac_kLpcShapeCdfVec01Ub166[71] = 178 { 179 0, 1, 2, 6, 13, 26, 55, 92, 180 141, 191, 242, 296, 355, 429, 522, 636, 181 777, 947, 1162, 1428, 1753, 2137, 2605, 3140, 182 3743, 4409, 5164, 6016, 6982, 8118, 9451, 10993, 183 12754, 14810, 17130, 19780, 22864, 26424, 30547, 35222, 184 40140, 44716, 48698, 52056, 54850, 57162, 59068, 60643, 185 61877, 62827, 63561, 64113, 64519, 64807, 65019, 65167, 186 65272, 65343, 65399, 65440, 65471, 65487, 65500, 65509, 187 65518, 65524, 65527, 65531, 65533, 65534, 65535 188 }; 189 190 /* 191 * An array of pointers to CDFs of decorrelated LARs 192 */ 193 const WebRtc_UWord16* WebRtcIsac_kLpcShapeCdfMatUb16 194 [UB_LPC_ORDER * UB16_LPC_VEC_PER_FRAME] = { 195 WebRtcIsac_kLpcShapeCdfVec01Ub16, 196 WebRtcIsac_kLpcShapeCdfVec1Ub16, 197 WebRtcIsac_kLpcShapeCdfVec2Ub16, 198 WebRtcIsac_kLpcShapeCdfVec3Ub16, 199 WebRtcIsac_kLpcShapeCdfVec4Ub16, 200 WebRtcIsac_kLpcShapeCdfVec5Ub16, 201 WebRtcIsac_kLpcShapeCdfVec6Ub16, 202 WebRtcIsac_kLpcShapeCdfVec7Ub16, 203 WebRtcIsac_kLpcShapeCdfVec8Ub16, 204 WebRtcIsac_kLpcShapeCdfVec01Ub160, 205 WebRtcIsac_kLpcShapeCdfVec01Ub161, 206 WebRtcIsac_kLpcShapeCdfVec01Ub162, 207 WebRtcIsac_kLpcShapeCdfVec01Ub163, 208 WebRtcIsac_kLpcShapeCdfVec01Ub164, 209 WebRtcIsac_kLpcShapeCdfVec01Ub165, 210 WebRtcIsac_kLpcShapeCdfVec01Ub166 211 }; 212 213 /* 214 * The smallest reconstruction points for quantiztion of LAR coefficients. 215 */ 216 const double WebRtcIsac_kLpcShapeLeftRecPointUb16 217 [UB_LPC_ORDER * UB16_LPC_VEC_PER_FRAME] = 218 { 219 -0.8250, -0.9750, -1.1250, -2.1750, -0.9750, -1.1250, -1.4250, 220 -2.6250, -1.4250, -1.2750, -1.8750, -3.6750, -1.7250, -1.8750, 221 -2.3250, -5.4750 222 }; 223 224 /* 225 * Number of reconstruction points of quantizers for LAR coefficients. 226 */ 227 const WebRtc_Word16 WebRtcIsac_kLpcShapeNumRecPointUb16 228 [UB_LPC_ORDER * UB16_LPC_VEC_PER_FRAME] = 229 { 230 13, 15, 17, 29, 15, 16, 20, 35, 20, 231 20, 27, 54, 25, 27, 33, 70 232 }; 233 234 /* 235 * Starting index for entropy decoder to search for the right interval, 236 * one entry per LAR coefficient 237 */ 238 const WebRtc_UWord16 WebRtcIsac_kLpcShapeEntropySearchUb16 239 [UB_LPC_ORDER * UB16_LPC_VEC_PER_FRAME] = 240 { 241 6, 7, 8, 14, 7, 8, 10, 17, 10, 242 10, 13, 27, 12, 13, 16, 35 243 }; 244 245 /* 246 * LAR quantization step-size. 247 */ 248 const double WebRtcIsac_kLpcShapeQStepSizeUb16 = 0.150000; 249
