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 */
7 /* Most of these tables are inlined at their point of use.
8 */
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 */
16 #define GSM_TABLE_C
17 #include "gsm610_priv.h"
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 };
28 /* Table 4.2 Tabulation of 1/A[1..8]
29 */
30 word gsm_INVA[8]={ 13107, 13107, 13107, 13107, 19223, 17476, 31454, 29708 };
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 };
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 };
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 };
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 };
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 };