Alexandre Lision | 7c6f4a6 | 2013-09-05 13:27:01 -0400 | [diff] [blame] | 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 }; |