FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/autocorr.c @ 282:9ee8ad3d4d30

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frtest: rm gsmfr-hand-test and gsmfr-max-out utils These hack programs were never properly documented and were written only as part of a debug chase, in pursuit of a bug that ultimately turned out to be in our then-hacky patch to osmo-bts-sysmo, before beginning of proper patches in Osmocom. These hack programs need to be dropped from the present sw package because they depend on old libgsm, and we are eliminating that dependency.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Apr 2024 05:44:47 +0000
parents 92dc7f0082a3
children
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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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45 /* Compute r[0] and test for overflow */
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47 overfl_shft = 0; move16 ();
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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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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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59 /* If overflow divide y[] by 4 */
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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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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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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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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 }