Logo Search packages:      
Sourcecode: libgsm version File versions  Download package

table.c

/*
 * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
 * Universitaet Berlin.  See the accompanying file "COPYRIGHT" for
 * details.  THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
 */

/* $Header: /tmp_amd/presto/export/kbs/jutta/src/gsm/RCS/table.c,v 1.1 1992/10/28 00:15:50 jutta Exp $ */

/*  Most of these tables are inlined at their point of use.
 */

/*  4.4 TABLES USED IN THE FIXED POINT IMPLEMENTATION OF THE RPE-LTP
 *      CODER AND DECODER
 *
 *    (Most of them inlined, so watch out.)
 */

#define     GSM_TABLE_C
#include "private.h"
#include    "gsm.h"

/*  Table 4.1  Quantization of the Log.-Area Ratios
 */
/* i             1      2      3        4      5      6        7       8 */
word gsm_A[8]   = {20480, 20480, 20480,  20480,  13964,  15360,   8534,  9036};
word gsm_B[8]   = {    0,     0,  2048,  -2560,     94,  -1792,   -341, -1144};
word gsm_MIC[8] = { -32,   -32,   -16,    -16,     -8,     -8,     -4,    -4 };
word gsm_MAC[8] = {  31,    31,    15,     15,      7,      7,      3,     3 };


/*  Table 4.2  Tabulation  of 1/A[1..8]
 */
word gsm_INVA[8]={ 13107, 13107,  13107, 13107,  19223, 17476,  31454, 29708 };


/*   Table 4.3a  Decision level of the LTP gain quantizer
 */
/*  bc                  0             1     2        3                  */
word gsm_DLB[4] = {  6554,    16384,      26214,         32767    };


/*   Table 4.3b   Quantization levels of the LTP gain quantizer
 */
/* bc             0          1        2          3                */
word gsm_QLB[4] = {  3277,    11469,      21299,         32767    };


/*   Table 4.4     Coefficients of the weighting filter
 */
/* i            0      1   2    3   4      5      6     7   8   9    10  */
word gsm_H[11] = {-134, -374, 0, 2054, 5741, 8192, 5741, 2054, 0, -374, -134 };


/*   Table 4.5     Normalized inverse mantissa used to compute xM/xmax 
 */
/* i              0        1    2      3      4      5     6      7   */
word gsm_NRFAC[8] = { 29128, 26215, 23832, 21846, 20165, 18725, 17476, 16384 };


/*   Table 4.6     Normalized direct mantissa used to compute xM/xmax
 */
/* i                  0      1       2      3      4      5      6      7   */
word gsm_FAC[8]   = { 18431, 20479, 22527, 24575, 26623, 28671, 30719, 32767 };

Generated by  Doxygen 1.6.0   Back to index