FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/autocorr.c @ 344:05a46720af0f
libtwamr: integrate d_plsf_3.c
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 19 Apr 2024 01:23:15 +0000 |
parents | 92dc7f0082a3 |
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rev | line source |
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1 /************************************************************************* |
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2 * |
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3 * FUNCTION: autocorr |
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4 * |
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5 * PURPOSE: Compute autocorrelations of signal with windowing |
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6 * |
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7 * DESCRIPTION: |
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8 * - Windowing of input speech: s'[n] = s[n] * w[n] |
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9 * - Autocorrelations of input speech: |
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10 * r[k] = sum_{i=k}^{239} s'[i]*s'[i-k] k=0,...,10 |
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11 * The autocorrelations are expressed in normalized double precision |
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12 * format. |
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13 * |
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14 *************************************************************************/ |
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15 |
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16 #include "gsm_efr.h" |
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17 #include "typedef.h" |
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18 #include "namespace.h" |
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19 #include "basic_op.h" |
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20 #include "oper_32b.h" |
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21 #include "no_count.h" |
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22 #include "cnst.h" |
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23 #include "sig_proc.h" |
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24 |
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25 Word16 Autocorr ( |
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26 Word16 x[], /* (i) : Input signal */ |
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27 Word16 m, /* (i) : LPC order */ |
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28 Word16 r_h[], /* (o) : Autocorrelations (msb) */ |
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29 Word16 r_l[], /* (o) : Autocorrelations (lsb) */ |
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30 const Word16 wind[] /* (i) : window for LPC analysis */ |
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31 ) |
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32 { |
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33 Word16 i, j, norm; |
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34 Word16 y[L_WINDOW]; |
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35 Word32 sum; |
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36 Word16 overfl, overfl_shft; |
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37 |
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38 /* Windowing of signal */ |
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39 |
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40 for (i = 0; i < L_WINDOW; i++) |
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41 { |
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42 y[i] = mult_r (x[i], wind[i]); move16 (); |
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43 } |
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44 |
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45 /* Compute r[0] and test for overflow */ |
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46 |
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47 overfl_shft = 0; move16 (); |
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48 |
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49 do |
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50 { |
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51 overfl = 0; move16 (); |
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52 sum = 0L; move32 (); |
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53 |
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54 for (i = 0; i < L_WINDOW; i++) |
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55 { |
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56 sum = L_mac (sum, y[i], y[i]); |
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57 } |
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58 |
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59 /* If overflow divide y[] by 4 */ |
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60 |
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61 test (); |
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62 if (L_sub (sum, MAX_32) == 0L) |
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63 { |
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64 overfl_shft = add (overfl_shft, 4); |
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65 overfl = 1; move16 (); /* Set the overflow flag */ |
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66 |
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67 for (i = 0; i < L_WINDOW; i++) |
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68 { |
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69 y[i] = shr (y[i], 2); move16 (); |
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70 } |
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71 } |
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72 test (); |
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73 } |
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74 while (overfl != 0); |
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75 |
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76 sum = L_add (sum, 1L); /* Avoid the case of all zeros */ |
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77 |
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78 /* Normalization of r[0] */ |
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79 |
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80 norm = norm_l (sum); |
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81 sum = L_shl (sum, norm); |
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82 L_Extract (sum, &r_h[0], &r_l[0]); /* Put in DPF format (see oper_32b) */ |
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83 |
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84 /* r[1] to r[m] */ |
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85 |
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86 for (i = 1; i <= m; i++) |
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87 { |
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88 sum = 0; move32 (); |
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89 |
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90 for (j = 0; j < L_WINDOW - i; j++) |
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91 { |
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92 sum = L_mac (sum, y[j], y[j + i]); |
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93 } |
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94 |
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95 sum = L_shl (sum, norm); |
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96 L_Extract (sum, &r_h[i], &r_l[i]); |
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97 } |
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98 |
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99 norm = sub (norm, overfl_shft); |
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100 |
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101 return norm; |
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102 } |