Mercurial > hg > audiostuff
comparison intercom/gsm/table.c @ 2:13be24d74cd2
import intercom-0.4.1
| author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
|---|---|
| date | Fri, 25 Jun 2010 09:57:52 +0200 |
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| 1:9cadc470e3da | 2:13be24d74cd2 |
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| 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: /home/kbs/jutta/src/gsm/gsm-1.0/src/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] = | |
| 26 { 20480, 20480, 20480, 20480, 13964, 15360, 8534, 9036 }; | |
| 27 word gsm_B[8] = { 0, 0, 2048, -2560, 94, -1792, -341, -1144 }; | |
| 28 word gsm_MIC[8] = { -32, -32, -16, -16, -8, -8, -4, -4 }; | |
| 29 word gsm_MAC[8] = { 31, 31, 15, 15, 7, 7, 3, 3 }; | |
| 30 | |
| 31 | |
| 32 /* Table 4.2 Tabulation of 1/A[1..8] | |
| 33 */ | |
| 34 word gsm_INVA[8] = | |
| 35 { 13107, 13107, 13107, 13107, 19223, 17476, 31454, 29708 }; | |
| 36 | |
| 37 | |
| 38 /* Table 4.3a Decision level of the LTP gain quantizer | |
| 39 */ | |
| 40 /* bc 0 1 2 3 */ | |
| 41 word gsm_DLB[4] = { 6554, 16384, 26214, 32767 }; | |
| 42 | |
| 43 | |
| 44 /* Table 4.3b Quantization levels of the LTP gain quantizer | |
| 45 */ | |
| 46 /* bc 0 1 2 3 */ | |
| 47 word gsm_QLB[4] = { 3277, 11469, 21299, 32767 }; | |
| 48 | |
| 49 | |
| 50 /* Table 4.4 Coefficients of the weighting filter | |
| 51 */ | |
| 52 /* i 0 1 2 3 4 5 6 7 8 9 10 */ | |
| 53 word gsm_H[11] = | |
| 54 { -134, -374, 0, 2054, 5741, 8192, 5741, 2054, 0, -374, -134 }; | |
| 55 | |
| 56 | |
| 57 /* Table 4.5 Normalized inverse mantissa used to compute xM/xmax | |
| 58 */ | |
| 59 /* i 0 1 2 3 4 5 6 7 */ | |
| 60 word gsm_NRFAC[8] = | |
| 61 { 29128, 26215, 23832, 21846, 20165, 18725, 17476, 16384 }; | |
| 62 | |
| 63 | |
| 64 /* Table 4.6 Normalized direct mantissa used to compute xM/xmax | |
| 65 */ | |
| 66 /* i 0 1 2 3 4 5 6 7 */ | |
| 67 word gsm_FAC[8] = | |
| 68 { 18431, 20479, 22527, 24575, 26623, 28671, 30719, 32767 }; |