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/*
* 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.
*/
/************************************************************************************
$Author: beq07716 $
$Revision: 1005 $
$Date: 2010-06-28 13:58:28 +0200 (Mon, 28 Jun 2010) $
*************************************************************************************/
/************************************************************************************/
/* */
/* 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};
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