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1 /*
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2 * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
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3 * Universitaet Berlin. See the accompanying file "COPYRIGHT" for
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4 * details. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
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5 */
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6
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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 $ */
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8
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9 /* Most of these tables are inlined at their point of use.
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10 */
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11
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12 /* 4.4 TABLES USED IN THE FIXED POINT IMPLEMENTATION OF THE RPE-LTP
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13 * CODER AND DECODER
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14 *
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15 * (Most of them inlined, so watch out.)
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16 */
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17
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18 #define GSM_TABLE_C
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19 #include "private.h"
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20 #include "gsm.h"
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21
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22 /* Table 4.1 Quantization of the Log.-Area Ratios
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23 */
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24 /* i 1 2 3 4 5 6 7 8 */
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25 word gsm_A[8] =
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26 { 20480, 20480, 20480, 20480, 13964, 15360, 8534, 9036 };
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27 word gsm_B[8] = { 0, 0, 2048, -2560, 94, -1792, -341, -1144 };
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28 word gsm_MIC[8] = { -32, -32, -16, -16, -8, -8, -4, -4 };
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29 word gsm_MAC[8] = { 31, 31, 15, 15, 7, 7, 3, 3 };
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30
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31
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32 /* Table 4.2 Tabulation of 1/A[1..8]
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33 */
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34 word gsm_INVA[8] =
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35 { 13107, 13107, 13107, 13107, 19223, 17476, 31454, 29708 };
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36
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37
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38 /* Table 4.3a Decision level of the LTP gain quantizer
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39 */
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40 /* bc 0 1 2 3 */
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41 word gsm_DLB[4] = { 6554, 16384, 26214, 32767 };
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42
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43
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44 /* Table 4.3b Quantization levels of the LTP gain quantizer
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45 */
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46 /* bc 0 1 2 3 */
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47 word gsm_QLB[4] = { 3277, 11469, 21299, 32767 };
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48
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49
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50 /* Table 4.4 Coefficients of the weighting filter
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51 */
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52 /* i 0 1 2 3 4 5 6 7 8 9 10 */
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53 word gsm_H[11] =
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54 { -134, -374, 0, 2054, 5741, 8192, 5741, 2054, 0, -374, -134 };
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55
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56
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57 /* Table 4.5 Normalized inverse mantissa used to compute xM/xmax
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58 */
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59 /* i 0 1 2 3 4 5 6 7 */
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60 word gsm_NRFAC[8] =
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61 { 29128, 26215, 23832, 21846, 20165, 18725, 17476, 16384 };
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62
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63
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64 /* Table 4.6 Normalized direct mantissa used to compute xM/xmax
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65 */
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66 /* i 0 1 2 3 4 5 6 7 */
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67 word gsm_FAC[8] =
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68 { 18431, 20479, 22527, 24575, 26623, 28671, 30719, 32767 };
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