LVEQNB_Tables.c revision d918324d44aa48b3b064ea9b87d0c520c38f15a9 
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 */
39const LVM_UINT16    LVEQNB_SampleRateTab[] = {8000,                    /* 8kS/s  */
40                                              11025,
41                                              12000,
42                                              16000,
43                                              22050,
44                                              24000,
45                                              32000,
46                                              44100,
47                                              48000};                  /* 48kS/s */
48
49
50/************************************************************************************/
51/*                                                                                  */
52/*    Coefficient calculation tables                                                */
53/*                                                                                  */
54/************************************************************************************/
55
56/*
57 * Table for 2 * Pi / Fs
58 */
59const LVM_INT16     LVEQNB_TwoPiOnFsTable[] = {LVEQNB_2PiOn_8000,      /* 8kS/s */
60                                               LVEQNB_2PiOn_11025,
61                                               LVEQNB_2PiOn_12000,
62                                               LVEQNB_2PiOn_16000,
63                                               LVEQNB_2PiOn_22050,
64                                               LVEQNB_2PiOn_24000,
65                                               LVEQNB_2PiOn_32000,
66                                               LVEQNB_2PiOn_44100,
67                                               LVEQNB_2PiOn_48000};    /* 48kS/s */
68
69/*
70 * Gain table
71 */
72const LVM_INT16     LVEQNB_GainTable[] = {LVEQNB_Gain_Neg15_dB,        /* -15dB gain */
73                                          LVEQNB_Gain_Neg14_dB,
74                                          LVEQNB_Gain_Neg13_dB,
75                                          LVEQNB_Gain_Neg12_dB,
76                                          LVEQNB_Gain_Neg11_dB,
77                                          LVEQNB_Gain_Neg10_dB,
78                                          LVEQNB_Gain_Neg9_dB,
79                                          LVEQNB_Gain_Neg8_dB,
80                                          LVEQNB_Gain_Neg7_dB,
81                                          LVEQNB_Gain_Neg6_dB,
82                                          LVEQNB_Gain_Neg5_dB,
83                                          LVEQNB_Gain_Neg4_dB,
84                                          LVEQNB_Gain_Neg3_dB,
85                                          LVEQNB_Gain_Neg2_dB,
86                                          LVEQNB_Gain_Neg1_dB,
87                                          LVEQNB_Gain_0_dB,            /* 0dB gain */
88                                          LVEQNB_Gain_1_dB,
89                                          LVEQNB_Gain_2_dB,
90                                          LVEQNB_Gain_3_dB,
91                                          LVEQNB_Gain_4_dB,
92                                          LVEQNB_Gain_5_dB,
93                                          LVEQNB_Gain_6_dB,
94                                          LVEQNB_Gain_7_dB,
95                                          LVEQNB_Gain_8_dB,
96                                          LVEQNB_Gain_9_dB,
97                                          LVEQNB_Gain_10_dB,
98                                          LVEQNB_Gain_11_dB,
99                                          LVEQNB_Gain_12_dB,
100                                          LVEQNB_Gain_13_dB,
101                                          LVEQNB_Gain_14_dB,
102                                          LVEQNB_Gain_15_dB};          /* +15dB gain */
103
104
105/*
106 * D table for 100 / (Gain + 1)
107 */
108const LVM_INT16    LVEQNB_DTable[] = {LVEQNB_100D_Neg15_dB,            /* -15dB gain */
109                                      LVEQNB_100D_Neg14_dB,
110                                      LVEQNB_100D_Neg13_dB,
111                                      LVEQNB_100D_Neg12_dB,
112                                      LVEQNB_100D_Neg11_dB,
113                                      LVEQNB_100D_Neg10_dB,
114                                      LVEQNB_100D_Neg9_dB,
115                                      LVEQNB_100D_Neg8_dB,
116                                      LVEQNB_100D_Neg7_dB,
117                                      LVEQNB_100D_Neg6_dB,
118                                      LVEQNB_100D_Neg5_dB,
119                                      LVEQNB_100D_Neg4_dB,
120                                      LVEQNB_100D_Neg3_dB,
121                                      LVEQNB_100D_Neg2_dB,
122                                      LVEQNB_100D_Neg1_dB,
123                                      LVEQNB_100D_0_dB};               /* 0dB gain */
124
125
126/************************************************************************************/
127/*                                                                                  */
128/*    Filter polynomial coefficients                                                */
129/*                                                                                  */
130/************************************************************************************/
131
132/*
133 * Coefficients for calculating the cosine with the equation:
134 *
135 *  Cos(x) = (2^Shifts)*(a0 + a1*x + a2*x^2 + a3*x^3 + a4*x^4 + a5*x^5)
136 *
137 * These coefficients expect the input, x, to be in the range 0 to 32768 respresenting
138 * a range of 0 to Pi. The output is in the range 32767 to -32768 representing the range
139 * +1.0 to -1.0
140 */
141const LVM_INT16     LVEQNB_CosCoef[] = {3,                             /* Shifts */
142                                        4096,                          /* a0 */
143                                        -36,                           /* a1 */
144                                        -19725,                        /* a2 */
145                                        -2671,                         /* a3 */
146                                        23730,                         /* a4 */
147                                        -9490};                        /* a5 */
148
149/*
150 * Coefficients for calculating the cosine error with the equation:
151 *
152 *  CosErr(x) = (2^Shifts)*(a0 + a1*x + a2*x^2 + a3*x^3)
153 *
154 * These coefficients expect the input, x, to be in the range 0 to 32768 respresenting
155 * a range of 0 to Pi/25. The output is in the range 0 to 32767 representing the range
156 * 0.0 to 0.0078852986
157 *
158 * This is used to give a double precision cosine over the range 0 to Pi/25 using the
159 * the equation:
160 *
161 * Cos(x) = 1.0 - CosErr(x)
162 */
163const LVM_INT16     LVEQNB_DPCosCoef[] = {1,                           /* Shifts */
164                                          0,                           /* a0 */
165                                          -6,                          /* a1 */
166                                          16586,                       /* a2 */
167                                          -44};                        /* a3 */
168
169/************************************************************************************/
170/*                                                                                  */
171/*  Bypass mixer time constants (100ms)                                             */
172/*                                                                                  */
173/************************************************************************************/
174
175#define LVEQNB_MIX_TC_Fs8000    32580         /* Floating point value 0.994262695 */
176#define LVEQNB_MIX_TC_Fs11025   32632         /* Floating point value 0.995849609 */
177#define LVEQNB_MIX_TC_Fs12000   32643         /* Floating point value 0.996185303 */
178#define LVEQNB_MIX_TC_Fs16000   32674         /* Floating point value 0.997131348 */
179#define LVEQNB_MIX_TC_Fs22050   32700         /* Floating point value 0.997924805 */
180#define LVEQNB_MIX_TC_Fs24000   32705         /* Floating point value 0.998077393 */
181#define LVEQNB_MIX_TC_Fs32000   32721         /* Floating point value 0.998565674 */
182#define LVEQNB_MIX_TC_Fs44100   32734         /* Floating point value 0.998962402 */
183#define LVEQNB_MIX_TC_Fs48000   32737         /* Floating point value 0.999053955 */
184
185
186const LVM_INT16 LVEQNB_MixerTCTable[] = {
187    LVEQNB_MIX_TC_Fs8000,
188    LVEQNB_MIX_TC_Fs11025,
189    LVEQNB_MIX_TC_Fs12000,
190    LVEQNB_MIX_TC_Fs16000,
191    LVEQNB_MIX_TC_Fs22050,
192    LVEQNB_MIX_TC_Fs24000,
193    LVEQNB_MIX_TC_Fs32000,
194    LVEQNB_MIX_TC_Fs44100,
195    LVEQNB_MIX_TC_Fs48000};
196