FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/pred_lt6.c @ 62:c87ccddf3fd1
libgsmefr: d_homing.c compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 26 Nov 2022 00:53:14 +0000 |
parents | 49dd1ac8e75b |
children | db8e0b69a6bb |
rev | line source |
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libgsmefr: import most *.c files from ETSI source
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1 /************************************************************************* |
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2 * |
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3 * FUNCTION: Pred_lt_6() |
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4 * |
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5 * PURPOSE: Compute the result of long term prediction with fractional |
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6 * interpolation of resolution 1/6. (Interpolated past excitation). |
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7 * |
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8 * DESCRIPTION: |
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9 * The past excitation signal at the given delay is interpolated at |
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10 * the given fraction to build the adaptive codebook excitation. |
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11 * On return exc[0..L_subfr-1] contains the interpolated signal |
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12 * (adaptive codebook excitation). |
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13 * |
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14 *************************************************************************/ |
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15 |
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16 #include "typedef.h" |
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17 #include "basic_op.h" |
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18 #include "count.h" |
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19 |
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20 #define UP_SAMP 6 |
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21 #define L_INTERPOL 10 |
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22 #define FIR_SIZE (UP_SAMP*L_INTERPOL+1) |
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23 |
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24 /* 1/6 resolution interpolation filter (-3 dB at 3600 Hz) */ |
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25 |
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26 static const Word16 inter_6[FIR_SIZE] = |
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27 { |
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28 29443, |
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29 28346, 25207, 20449, 14701, 8693, 3143, |
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30 -1352, -4402, -5865, -5850, -4673, -2783, |
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31 -672, 1211, 2536, 3130, 2991, 2259, |
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32 1170, 0, -1001, -1652, -1868, -1666, |
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33 -1147, -464, 218, 756, 1060, 1099, |
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34 904, 550, 135, -245, -514, -634, |
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35 -602, -451, -231, 0, 191, 308, |
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36 340, 296, 198, 78, -36, -120, |
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37 -163, -165, -132, -79, -19, 34, |
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38 73, 91, 89, 70, 38, 0 |
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39 }; |
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40 |
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41 void Pred_lt_6 ( |
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42 Word16 exc[], /* in/out: excitation buffer */ |
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43 Word16 T0, /* input : integer pitch lag */ |
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44 Word16 frac, /* input : fraction of lag */ |
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45 Word16 L_subfr /* input : subframe size */ |
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46 ) |
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47 { |
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48 Word16 i, j, k; |
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49 Word16 *x0, *x1, *x2; |
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50 const Word16 *c1, *c2; |
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51 Word32 s; |
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52 |
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53 x0 = &exc[-T0]; move16 (); |
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54 |
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55 frac = negate (frac); |
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56 test (); |
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57 if (frac < 0) |
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58 { |
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59 frac = add (frac, UP_SAMP); |
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60 x0--; |
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61 } |
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62 for (j = 0; j < L_subfr; j++) |
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63 { |
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64 x1 = x0++; move16 (); |
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65 x2 = x0; move16 (); |
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66 c1 = &inter_6[frac]; |
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67 c2 = &inter_6[sub (UP_SAMP, frac)]; |
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68 |
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69 s = 0; move32 (); |
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70 for (i = 0, k = 0; i < L_INTERPOL; i++, k += UP_SAMP) |
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71 { |
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72 s = L_mac (s, x1[-i], c1[k]); |
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73 s = L_mac (s, x2[i], c2[k]); |
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74 } |
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75 |
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76 exc[j] = round (s); move16 (); |
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77 } |
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78 |
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79 return; |
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80 } |