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 /* $Header: /tmp_amd/presto/export/kbs/jutta/src/gsm/RCS/table.c,v 1.1 1992/10/28 00:15:50 jutta Exp $ */ 8 9 /* Most of these tables are inlined at their point of use. 10 */ 11 12 /* 4.4 TABLES USED IN THE FIXED POINT IMPLEMENTATION OF THE RPE-LTP 13 * CODER AND DECODER 14 * 15 * (Most of them inlined, so watch out.) 16 */ 17 18 #define GSM_TABLE_C 19 #include "private.h" 20 #include "gsm.h" 21 22 /* Table 4.1 Quantization of the Log.-Area Ratios 23 */ 24 /* i 1 2 3 4 5 6 7 8 */ 25 word gsm_A[8] = {20480, 20480, 20480, 20480, 13964, 15360, 8534, 9036}; 26 word gsm_B[8] = { 0, 0, 2048, -2560, 94, -1792, -341, -1144}; 27 word gsm_MIC[8] = { -32, -32, -16, -16, -8, -8, -4, -4 }; 28 word gsm_MAC[8] = { 31, 31, 15, 15, 7, 7, 3, 3 }; 29 30 31 /* Table 4.2 Tabulation of 1/A[1..8] 32 */ 33 word gsm_INVA[8]={ 13107, 13107, 13107, 13107, 19223, 17476, 31454, 29708 }; 34 35 36 /* Table 4.3a Decision level of the LTP gain quantizer 37 */ 38 /* bc 0 1 2 3 */ 39 word gsm_DLB[4] = { 6554, 16384, 26214, 32767 }; 40 41 42 /* Table 4.3b Quantization levels of the LTP gain quantizer 43 */ 44 /* bc 0 1 2 3 */ 45 word gsm_QLB[4] = { 3277, 11469, 21299, 32767 }; 46 47 48 /* Table 4.4 Coefficients of the weighting filter 49 */ 50 /* i 0 1 2 3 4 5 6 7 8 9 10 */ 51 word gsm_H[11] = {-134, -374, 0, 2054, 5741, 8192, 5741, 2054, 0, -374, -134 }; 52 53 54 /* Table 4.5 Normalized inverse mantissa used to compute xM/xmax 55 */ 56 /* i 0 1 2 3 4 5 6 7 */ 57 word gsm_NRFAC[8] = { 29128, 26215, 23832, 21846, 20165, 18725, 17476, 16384 }; 58 59 60 /* Table 4.6 Normalized direct mantissa used to compute xM/xmax 61 */ 62 /* i 0 1 2 3 4 5 6 7 */ 63 word gsm_FAC[8] = { 18431, 20479, 22527, 24575, 26623, 28671, 30719, 32767 }; 64
