1 /* 2 * Copyright (C) 2004-2010 NXP Software 3 * Copyright (C) 2010 The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 19 /************************************************************************************/ 20 /* */ 21 /* Includes */ 22 /* */ 23 /************************************************************************************/ 24 25 #include "LVEQNB.h" 26 #include "LVEQNB_Coeffs.h" 27 28 29 /************************************************************************************/ 30 /* */ 31 /* Sample rate table */ 32 /* */ 33 /************************************************************************************/ 34 35 /* 36 * Sample rate table for converting between the enumerated type and the actual 37 * frequency 38 */ 39 #if defined(BUILD_FLOAT) && defined(HIGHER_FS) 40 const LVM_UINT32 LVEQNB_SampleRateTab[] = {8000, /* 8kS/s */ 41 11025, 42 12000, 43 16000, 44 22050, 45 24000, 46 32000, 47 44100, 48 48000, 49 96000, 50 192000 51 }; 52 #else 53 const LVM_UINT16 LVEQNB_SampleRateTab[] = {8000, /* 8kS/s */ 54 11025, 55 12000, 56 16000, 57 22050, 58 24000, 59 32000, 60 44100, 61 48000 62 }; 63 #endif 64 65 /************************************************************************************/ 66 /* */ 67 /* Coefficient calculation tables */ 68 /* */ 69 /************************************************************************************/ 70 71 /* 72 * Table for 2 * Pi / Fs 73 */ 74 #ifdef BUILD_FLOAT 75 const LVM_FLOAT LVEQNB_TwoPiOnFsTable[] = {LVEQNB_2PiOn_8000, /* 8kS/s */ 76 LVEQNB_2PiOn_11025, 77 LVEQNB_2PiOn_12000, 78 LVEQNB_2PiOn_16000, 79 LVEQNB_2PiOn_22050, 80 LVEQNB_2PiOn_24000, 81 LVEQNB_2PiOn_32000, 82 LVEQNB_2PiOn_44100, 83 LVEQNB_2PiOn_48000 84 #ifdef HIGHER_FS 85 ,LVEQNB_2PiOn_96000 86 ,LVEQNB_2PiOn_192000 87 #endif 88 }; 89 #else 90 const LVM_INT16 LVEQNB_TwoPiOnFsTable[] = {LVEQNB_2PiOn_8000, /* 8kS/s */ 91 LVEQNB_2PiOn_11025, 92 LVEQNB_2PiOn_12000, 93 LVEQNB_2PiOn_16000, 94 LVEQNB_2PiOn_22050, 95 LVEQNB_2PiOn_24000, 96 LVEQNB_2PiOn_32000, 97 LVEQNB_2PiOn_44100, 98 LVEQNB_2PiOn_48000}; /* 48kS/s */ 99 #endif 100 101 /* 102 * Gain table 103 */ 104 #ifdef BUILD_FLOAT 105 const LVM_FLOAT LVEQNB_GainTable[] = {LVEQNB_Gain_Neg15_dB, /* -15dB gain */ 106 LVEQNB_Gain_Neg14_dB, 107 LVEQNB_Gain_Neg13_dB, 108 LVEQNB_Gain_Neg12_dB, 109 LVEQNB_Gain_Neg11_dB, 110 LVEQNB_Gain_Neg10_dB, 111 LVEQNB_Gain_Neg9_dB, 112 LVEQNB_Gain_Neg8_dB, 113 LVEQNB_Gain_Neg7_dB, 114 LVEQNB_Gain_Neg6_dB, 115 LVEQNB_Gain_Neg5_dB, 116 LVEQNB_Gain_Neg4_dB, 117 LVEQNB_Gain_Neg3_dB, 118 LVEQNB_Gain_Neg2_dB, 119 LVEQNB_Gain_Neg1_dB, 120 LVEQNB_Gain_0_dB, /* 0dB gain */ 121 LVEQNB_Gain_1_dB, 122 LVEQNB_Gain_2_dB, 123 LVEQNB_Gain_3_dB, 124 LVEQNB_Gain_4_dB, 125 LVEQNB_Gain_5_dB, 126 LVEQNB_Gain_6_dB, 127 LVEQNB_Gain_7_dB, 128 LVEQNB_Gain_8_dB, 129 LVEQNB_Gain_9_dB, 130 LVEQNB_Gain_10_dB, 131 LVEQNB_Gain_11_dB, 132 LVEQNB_Gain_12_dB, 133 LVEQNB_Gain_13_dB, 134 LVEQNB_Gain_14_dB, 135 LVEQNB_Gain_15_dB}; /* +15dB gain */ 136 #else 137 const LVM_INT16 LVEQNB_GainTable[] = {LVEQNB_Gain_Neg15_dB, /* -15dB gain */ 138 LVEQNB_Gain_Neg14_dB, 139 LVEQNB_Gain_Neg13_dB, 140 LVEQNB_Gain_Neg12_dB, 141 LVEQNB_Gain_Neg11_dB, 142 LVEQNB_Gain_Neg10_dB, 143 LVEQNB_Gain_Neg9_dB, 144 LVEQNB_Gain_Neg8_dB, 145 LVEQNB_Gain_Neg7_dB, 146 LVEQNB_Gain_Neg6_dB, 147 LVEQNB_Gain_Neg5_dB, 148 LVEQNB_Gain_Neg4_dB, 149 LVEQNB_Gain_Neg3_dB, 150 LVEQNB_Gain_Neg2_dB, 151 LVEQNB_Gain_Neg1_dB, 152 LVEQNB_Gain_0_dB, /* 0dB gain */ 153 LVEQNB_Gain_1_dB, 154 LVEQNB_Gain_2_dB, 155 LVEQNB_Gain_3_dB, 156 LVEQNB_Gain_4_dB, 157 LVEQNB_Gain_5_dB, 158 LVEQNB_Gain_6_dB, 159 LVEQNB_Gain_7_dB, 160 LVEQNB_Gain_8_dB, 161 LVEQNB_Gain_9_dB, 162 LVEQNB_Gain_10_dB, 163 LVEQNB_Gain_11_dB, 164 LVEQNB_Gain_12_dB, 165 LVEQNB_Gain_13_dB, 166 LVEQNB_Gain_14_dB, 167 LVEQNB_Gain_15_dB}; /* +15dB gain */ 168 169 #endif 170 /* 171 * D table for 100 / (Gain + 1) 172 */ 173 #ifdef BUILD_FLOAT 174 const LVM_FLOAT LVEQNB_DTable[] = {LVEQNB_100D_Neg15_dB, /* -15dB gain */ 175 LVEQNB_100D_Neg14_dB, 176 LVEQNB_100D_Neg13_dB, 177 LVEQNB_100D_Neg12_dB, 178 LVEQNB_100D_Neg11_dB, 179 LVEQNB_100D_Neg10_dB, 180 LVEQNB_100D_Neg9_dB, 181 LVEQNB_100D_Neg8_dB, 182 LVEQNB_100D_Neg7_dB, 183 LVEQNB_100D_Neg6_dB, 184 LVEQNB_100D_Neg5_dB, 185 LVEQNB_100D_Neg4_dB, 186 LVEQNB_100D_Neg3_dB, 187 LVEQNB_100D_Neg2_dB, 188 LVEQNB_100D_Neg1_dB, 189 LVEQNB_100D_0_dB}; /* 0dB gain */ 190 #else 191 const LVM_INT16 LVEQNB_DTable[] = {LVEQNB_100D_Neg15_dB, /* -15dB gain */ 192 LVEQNB_100D_Neg14_dB, 193 LVEQNB_100D_Neg13_dB, 194 LVEQNB_100D_Neg12_dB, 195 LVEQNB_100D_Neg11_dB, 196 LVEQNB_100D_Neg10_dB, 197 LVEQNB_100D_Neg9_dB, 198 LVEQNB_100D_Neg8_dB, 199 LVEQNB_100D_Neg7_dB, 200 LVEQNB_100D_Neg6_dB, 201 LVEQNB_100D_Neg5_dB, 202 LVEQNB_100D_Neg4_dB, 203 LVEQNB_100D_Neg3_dB, 204 LVEQNB_100D_Neg2_dB, 205 LVEQNB_100D_Neg1_dB, 206 LVEQNB_100D_0_dB}; /* 0dB gain */ 207 208 #endif 209 /************************************************************************************/ 210 /* */ 211 /* Filter polynomial coefficients */ 212 /* */ 213 /************************************************************************************/ 214 215 /* 216 * Coefficients for calculating the cosine with the equation: 217 * 218 * Cos(x) = (2^Shifts)*(a0 + a1*x + a2*x^2 + a3*x^3 + a4*x^4 + a5*x^5) 219 * 220 * These coefficients expect the input, x, to be in the range 0 to 32768 respresenting 221 * a range of 0 to Pi. The output is in the range 32767 to -32768 representing the range 222 * +1.0 to -1.0 223 */ 224 const LVM_INT16 LVEQNB_CosCoef[] = {3, /* Shifts */ 225 4096, /* a0 */ 226 -36, /* a1 */ 227 -19725, /* a2 */ 228 -2671, /* a3 */ 229 23730, /* a4 */ 230 -9490}; /* a5 */ 231 232 /* 233 * Coefficients for calculating the cosine error with the equation: 234 * 235 * CosErr(x) = (2^Shifts)*(a0 + a1*x + a2*x^2 + a3*x^3) 236 * 237 * These coefficients expect the input, x, to be in the range 0 to 32768 respresenting 238 * a range of 0 to Pi/25. The output is in the range 0 to 32767 representing the range 239 * 0.0 to 0.0078852986 240 * 241 * This is used to give a double precision cosine over the range 0 to Pi/25 using the 242 * the equation: 243 * 244 * Cos(x) = 1.0 - CosErr(x) 245 */ 246 const LVM_INT16 LVEQNB_DPCosCoef[] = {1, /* Shifts */ 247 0, /* a0 */ 248 -6, /* a1 */ 249 16586, /* a2 */ 250 -44}; /* a3 */ 251 252 /************************************************************************************/ 253 /* */ 254 /* Bypass mixer time constants (100ms) */ 255 /* */ 256 /************************************************************************************/ 257 258 #define LVEQNB_MIX_TC_Fs8000 32580 /* Floating point value 0.994262695 */ 259 #define LVEQNB_MIX_TC_Fs11025 32632 /* Floating point value 0.995849609 */ 260 #define LVEQNB_MIX_TC_Fs12000 32643 /* Floating point value 0.996185303 */ 261 #define LVEQNB_MIX_TC_Fs16000 32674 /* Floating point value 0.997131348 */ 262 #define LVEQNB_MIX_TC_Fs22050 32700 /* Floating point value 0.997924805 */ 263 #define LVEQNB_MIX_TC_Fs24000 32705 /* Floating point value 0.998077393 */ 264 #define LVEQNB_MIX_TC_Fs32000 32721 /* Floating point value 0.998565674 */ 265 #define LVEQNB_MIX_TC_Fs44100 32734 /* Floating point value 0.998962402 */ 266 #define LVEQNB_MIX_TC_Fs48000 32737 /* Floating point value 0.999053955 */ 267 268 269 const LVM_INT16 LVEQNB_MixerTCTable[] = { 270 LVEQNB_MIX_TC_Fs8000, 271 LVEQNB_MIX_TC_Fs11025, 272 LVEQNB_MIX_TC_Fs12000, 273 LVEQNB_MIX_TC_Fs16000, 274 LVEQNB_MIX_TC_Fs22050, 275 LVEQNB_MIX_TC_Fs24000, 276 LVEQNB_MIX_TC_Fs32000, 277 LVEQNB_MIX_TC_Fs44100, 278 LVEQNB_MIX_TC_Fs48000}; 279
