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 */ 22int16_t gsm_A [8] = { 20480, 20480, 20480, 20480, 13964, 15360, 8534, 9036 } ; 23int16_t gsm_B [8] = { 0, 0, 2048, -2560, 94, -1792, -341, -1144 } ; 24int16_t gsm_MIC [8] = { -32, -32, -16, -16, -8, -8, -4, -4 } ; 25int16_t gsm_MAC [8] = { 31, 31, 15, 15, 7, 7, 3, 3 } ; 26 27 28/* Table 4.2 Tabulation of 1/A[1..8] 29 */ 30int16_t 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 */ 36int16_t 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 */ 42int16_t 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 */ 48int16_t 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 */ 54int16_t 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 */ 60int16_t gsm_FAC [8] = { 18431, 20479, 22527, 24575, 26623, 28671, 30719, 32767 } ; 61