| /* |
| * 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}; |
