1 /***************************************************************************
2 * Copyright (C) 2012 by Pere Ràfols Soler *
3 * sapista2@gmail.com *
4 * *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
9 * *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
14 * *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the *
17 * Free Software Foundation, Inc., *
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
19 ***************************************************************************/
20
21 /***************************************************************************
22 This file contains the dB to linear convertion base on a LUT
23 ****************************************************************************/
24
25 #ifndef _DB_2_LINEAR
26 #define _DB_2_LINEAR
27
28 #include "dblut.h"
29
30 //Converts a value from dB to Linear 1 Linear = 0 dB
dB2Lin(float dbIn)31 static inline float dB2Lin(float dbIn)
32 {
33 int index = (int)(DB2LIN_M*dbIn + DB2LIN_N);
34 index = index > 0 ? index : 0;
35 index = index > LUT_TOP_INDEX ? LUT_TOP_INDEX : index;
36 return dB2Lin_LUT[index];
37 }
38
39 //Converts a value from Linear to dB 1 Linear = 0 dB
Lin2dB(float LinIn)40 static inline float Lin2dB(float LinIn)
41 {
42 int index = (int)(LIN2DB_M*LinIn + LIN2DB_N);
43 index = index > 0 ? index : 0;
44 index = index > LUT_TOP_INDEX ? LUT_TOP_INDEX : index;
45 return Lin2dB_LUT[index];
46 }
47
48
49 #endif