/* * Copyright (C) 2004-2010 NXP Software * Copyright (C) 2010 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /************************************************************************************/ /* */ /* Includes */ /* */ /************************************************************************************/ #include "LVEQNB.h" #include "LVEQNB_Coeffs.h" /************************************************************************************/ /* */ /* Sample rate table */ /* */ /************************************************************************************/ /* * Sample rate table for converting between the enumerated type and the actual * frequency */ const LVM_UINT16 LVEQNB_SampleRateTab[] = {8000, /* 8kS/s */ 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000}; /* 48kS/s */ /************************************************************************************/ /* */ /* Coefficient calculation tables */ /* */ /************************************************************************************/ /* * Table for 2 * Pi / Fs */ const LVM_INT16 LVEQNB_TwoPiOnFsTable[] = {LVEQNB_2PiOn_8000, /* 8kS/s */ LVEQNB_2PiOn_11025, LVEQNB_2PiOn_12000, LVEQNB_2PiOn_16000, LVEQNB_2PiOn_22050, LVEQNB_2PiOn_24000, LVEQNB_2PiOn_32000, LVEQNB_2PiOn_44100, LVEQNB_2PiOn_48000}; /* 48kS/s */ /* * Gain table */ const LVM_INT16 LVEQNB_GainTable[] = {LVEQNB_Gain_Neg15_dB, /* -15dB gain */ LVEQNB_Gain_Neg14_dB, LVEQNB_Gain_Neg13_dB, LVEQNB_Gain_Neg12_dB, LVEQNB_Gain_Neg11_dB, LVEQNB_Gain_Neg10_dB, LVEQNB_Gain_Neg9_dB, LVEQNB_Gain_Neg8_dB, LVEQNB_Gain_Neg7_dB, LVEQNB_Gain_Neg6_dB, LVEQNB_Gain_Neg5_dB, LVEQNB_Gain_Neg4_dB, LVEQNB_Gain_Neg3_dB, LVEQNB_Gain_Neg2_dB, LVEQNB_Gain_Neg1_dB, LVEQNB_Gain_0_dB, /* 0dB gain */ LVEQNB_Gain_1_dB, LVEQNB_Gain_2_dB, LVEQNB_Gain_3_dB, LVEQNB_Gain_4_dB, LVEQNB_Gain_5_dB, LVEQNB_Gain_6_dB, LVEQNB_Gain_7_dB, LVEQNB_Gain_8_dB, LVEQNB_Gain_9_dB, LVEQNB_Gain_10_dB, LVEQNB_Gain_11_dB, LVEQNB_Gain_12_dB, LVEQNB_Gain_13_dB, LVEQNB_Gain_14_dB, LVEQNB_Gain_15_dB}; /* +15dB gain */ /* * D table for 100 / (Gain + 1) */ const LVM_INT16 LVEQNB_DTable[] = {LVEQNB_100D_Neg15_dB, /* -15dB gain */ LVEQNB_100D_Neg14_dB, LVEQNB_100D_Neg13_dB, LVEQNB_100D_Neg12_dB, LVEQNB_100D_Neg11_dB, LVEQNB_100D_Neg10_dB, LVEQNB_100D_Neg9_dB, LVEQNB_100D_Neg8_dB, LVEQNB_100D_Neg7_dB, LVEQNB_100D_Neg6_dB, LVEQNB_100D_Neg5_dB, LVEQNB_100D_Neg4_dB, LVEQNB_100D_Neg3_dB, LVEQNB_100D_Neg2_dB, LVEQNB_100D_Neg1_dB, LVEQNB_100D_0_dB}; /* 0dB gain */ /************************************************************************************/ /* */ /* Filter polynomial coefficients */ /* */ /************************************************************************************/ /* * Coefficients for calculating the cosine with the equation: * * Cos(x) = (2^Shifts)*(a0 + a1*x + a2*x^2 + a3*x^3 + a4*x^4 + a5*x^5) * * These coefficients expect the input, x, to be in the range 0 to 32768 respresenting * a range of 0 to Pi. The output is in the range 32767 to -32768 representing the range * +1.0 to -1.0 */ const LVM_INT16 LVEQNB_CosCoef[] = {3, /* Shifts */ 4096, /* a0 */ -36, /* a1 */ -19725, /* a2 */ -2671, /* a3 */ 23730, /* a4 */ -9490}; /* a5 */ /* * Coefficients for calculating the cosine error with the equation: * * CosErr(x) = (2^Shifts)*(a0 + a1*x + a2*x^2 + a3*x^3) * * These coefficients expect the input, x, to be in the range 0 to 32768 respresenting * a range of 0 to Pi/25. The output is in the range 0 to 32767 representing the range * 0.0 to 0.0078852986 * * This is used to give a double precision cosine over the range 0 to Pi/25 using the * the equation: * * Cos(x) = 1.0 - CosErr(x) */ const LVM_INT16 LVEQNB_DPCosCoef[] = {1, /* Shifts */ 0, /* a0 */ -6, /* a1 */ 16586, /* a2 */ -44}; /* a3 */ /************************************************************************************/ /* */ /* Bypass mixer time constants (100ms) */ /* */ /************************************************************************************/ #define LVEQNB_MIX_TC_Fs8000 32580 /* Floating point value 0.994262695 */ #define LVEQNB_MIX_TC_Fs11025 32632 /* Floating point value 0.995849609 */ #define LVEQNB_MIX_TC_Fs12000 32643 /* Floating point value 0.996185303 */ #define LVEQNB_MIX_TC_Fs16000 32674 /* Floating point value 0.997131348 */ #define LVEQNB_MIX_TC_Fs22050 32700 /* Floating point value 0.997924805 */ #define LVEQNB_MIX_TC_Fs24000 32705 /* Floating point value 0.998077393 */ #define LVEQNB_MIX_TC_Fs32000 32721 /* Floating point value 0.998565674 */ #define LVEQNB_MIX_TC_Fs44100 32734 /* Floating point value 0.998962402 */ #define LVEQNB_MIX_TC_Fs48000 32737 /* Floating point value 0.999053955 */ const LVM_INT16 LVEQNB_MixerTCTable[] = { LVEQNB_MIX_TC_Fs8000, LVEQNB_MIX_TC_Fs11025, LVEQNB_MIX_TC_Fs12000, LVEQNB_MIX_TC_Fs16000, LVEQNB_MIX_TC_Fs22050, LVEQNB_MIX_TC_Fs24000, LVEQNB_MIX_TC_Fs32000, LVEQNB_MIX_TC_Fs44100, LVEQNB_MIX_TC_Fs48000};