interpretor/libsndfile-1.0.25/src/GSM610/table.c

   1 /*
   2  * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
   3  * Universitaet Berlin.  See the accompanying file "COPYRIGHT" for
   4  * details.  THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
   5  */
   6
   7 /*  Most of these tables are inlined at their point of use.
   8  */
   9
  10 /*  4.4 TABLES USED IN THE FIXED POINT IMPLEMENTATION OF THE RPE-LTP
  11  *      CODER AND DECODER
  12  *
  13  *      (Most of them inlined, so watch out.)
  14  */
  15
  16 #define GSM_TABLE_C
  17 #include "gsm610_priv.h"
  18
  19 /*  Table 4.1  Quantization of the Log.-Area Ratios
  20  */
  21 /* i                 1      2      3        4      5      6        7       8 */
  22 word gsm_A[8]   = {20480, 20480, 20480,  20480,  13964,  15360,   8534,  9036};
  23 word gsm_B[8]   = {    0,     0,  2048,  -2560,     94,  -1792,   -341, -1144};
  24 word gsm_MIC[8] = { -32,   -32,   -16,    -16,     -8,     -8,     -4,    -4 };
  25 word gsm_MAC[8] = {  31,    31,    15,     15,      7,      7,      3,     3 };
  26
  27
  28 /*  Table 4.2  Tabulation  of 1/A[1..8]
  29  */
  30 word gsm_INVA[8]={ 13107, 13107,  13107, 13107,  19223, 17476,  31454, 29708 };
  31
  32
  33 /*   Table 4.3a  Decision level of the LTP gain quantizer
  34  */
  35 /*  bc                0         1         2          3                  */
  36 word gsm_DLB[4] = {  6554,    16384,    26214,     32767        };
  37
  38
  39 /*   Table 4.3b   Quantization levels of the LTP gain quantizer
  40  */
  41 /* bc                 0          1        2          3                  */
  42 word gsm_QLB[4] = {  3277,    11469,    21299,     32767        };
  43
  44
  45 /*   Table 4.4   Coefficients of the weighting filter
  46  */
  47 /* i                0      1   2    3   4      5      6     7   8   9    10  */
  48 word gsm_H[11] = {-134, -374, 0, 2054, 5741, 8192, 5741, 2054, 0, -374, -134 };
  49
  50
  51 /*   Table 4.5   Normalized inverse mantissa used to compute xM/xmax
  52  */
  53 /* i                    0        1    2      3      4      5     6      7   */
  54 word gsm_NRFAC[8] = { 29128, 26215, 23832, 21846, 20165, 18725, 17476, 16384 };
  55
  56
  57 /*   Table 4.6   Normalized direct mantissa used to compute xM/xmax
  58  */
  59 /* i                  0      1       2      3      4      5      6      7   */
  60 word gsm_FAC[8] = { 18431, 20479, 22527, 24575, 26623, 28671, 30719, 32767 };