FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/lsp_az.c @ 282:9ee8ad3d4d30
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> |
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date | Sun, 14 Apr 2024 05:44:47 +0000 |
parents | 5bc228bb421e |
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rev | line source |
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1 /************************************************************************* |
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2 * |
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3 * FUNCTION: Lsp_Az |
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4 * |
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5 * PURPOSE: Converts from the line spectral pairs (LSP) to |
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6 * LP coefficients, for a 10th order filter. |
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7 * |
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8 * DESCRIPTION: |
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9 * - Find the coefficients of F1(z) and F2(z) (see Get_lsp_pol) |
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10 * - Multiply F1(z) by 1+z^{-1} and F2(z) by 1-z^{-1} |
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11 * - A(z) = ( F1(z) + F2(z) ) / 2 |
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12 * |
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13 *************************************************************************/ |
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14 |
78
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15 #include "gsm_efr.h" |
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16 #include "typedef.h" |
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17 #include "namespace.h" |
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18 #include "basic_op.h" |
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19 #include "oper_32b.h" |
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20 #include "no_count.h" |
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21 #include "sig_proc.h" |
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22 |
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23 /* local function */ |
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24 |
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25 static void Get_lsp_pol (Word16 *lsp, Word32 *f); |
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26 |
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27 void Lsp_Az ( |
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28 Word16 lsp[], /* (i) : line spectral frequencies */ |
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29 Word16 a[] /* (o) : predictor coefficients (order = 10) */ |
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30 ) |
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31 { |
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32 Word16 i, j; |
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33 Word32 f1[6], f2[6]; |
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34 Word32 t0; |
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35 |
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36 Get_lsp_pol (&lsp[0], f1); |
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37 Get_lsp_pol (&lsp[1], f2); |
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38 |
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39 for (i = 5; i > 0; i--) |
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40 { |
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41 f1[i] = L_add (f1[i], f1[i - 1]); move32 (); /* f1[i] += f1[i-1]; */ |
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42 f2[i] = L_sub (f2[i], f2[i - 1]); move32 (); /* f2[i] -= f2[i-1]; */ |
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43 } |
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44 |
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45 a[0] = 4096; move16 (); |
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46 for (i = 1, j = 10; i <= 5; i++, j--) |
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47 { |
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48 t0 = L_add (f1[i], f2[i]); /* f1[i] + f2[i] */ |
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49 a[i] = extract_l (L_shr_r (t0, 13)); move16 (); |
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50 t0 = L_sub (f1[i], f2[i]); /* f1[i] - f2[i] */ |
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51 a[j] = extract_l (L_shr_r (t0, 13)); move16 (); |
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52 } |
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53 |
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54 return; |
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55 } |
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56 |
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57 /************************************************************************* |
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58 * |
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59 * FUNCTION: Get_lsp_pol |
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60 * |
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61 * PURPOSE: Find the polynomial F1(z) or F2(z) from the LSPs. |
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62 * If the LSP vector is passed at address 0 F1(z) is computed |
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63 * and if it is passed at address 1 F2(z) is computed. |
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64 * |
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65 * DESCRIPTION: |
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66 * This is performed by expanding the product polynomials: |
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67 * |
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68 * F1(z) = product ( 1 - 2 lsp[i] z^-1 + z^-2 ) |
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69 * i=0,2,4,6,8 |
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70 * F2(z) = product ( 1 - 2 lsp[i] z^-1 + z^-2 ) |
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71 * i=1,3,5,7,9 |
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72 * |
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73 * where lsp[] is the LSP vector in the cosine domain. |
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74 * |
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75 * The expansion is performed using the following recursion: |
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76 * |
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77 * f[0] = 1 |
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78 * b = -2.0 * lsp[0] |
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79 * f[1] = b |
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80 * for i=2 to 5 do |
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81 * b = -2.0 * lsp[2*i-2]; |
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82 * f[i] = b*f[i-1] + 2.0*f[i-2]; |
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83 * for j=i-1 down to 2 do |
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84 * f[j] = f[j] + b*f[j-1] + f[j-2]; |
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85 * f[1] = f[1] + b; |
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86 * |
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87 *************************************************************************/ |
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88 |
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89 static void Get_lsp_pol (Word16 *lsp, Word32 *f) |
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90 { |
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91 Word16 i, j, hi, lo; |
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92 Word32 t0; |
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93 |
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94 /* f[0] = 1.0; */ |
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95 *f = L_mult (4096, 2048); move32 (); |
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96 f++; move32 (); |
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97 *f = L_msu ((Word32) 0, *lsp, 512); /* f[1] = -2.0 * lsp[0]; */ |
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98 f++; move32 (); |
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99 lsp += 2; /* Advance lsp pointer */ |
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100 |
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101 for (i = 2; i <= 5; i++) |
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102 { |
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103 *f = f[-2]; move32 (); |
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104 |
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105 for (j = 1; j < i; j++, f--) |
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106 { |
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107 L_Extract (f[-1], &hi, &lo); |
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108 t0 = Mpy_32_16 (hi, lo, *lsp); /* t0 = f[-1] * lsp */ |
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109 t0 = L_shl (t0, 1); |
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110 *f = L_add (*f, f[-2]); move32 (); /* *f += f[-2] */ |
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111 *f = L_sub (*f, t0);move32 (); /* *f -= t0 */ |
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112 } |
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113 *f = L_msu (*f, *lsp, 512); move32 (); /* *f -= lsp<<9 */ |
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114 f += i; /* Advance f pointer */ |
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115 lsp += 2; /* Advance lsp pointer */ |
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116 } |
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117 |
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118 return; |
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119 } |