FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/lsp_az.c @ 242:f081a6850fb5
libgsmfrp: new refined implementation
The previous implementation exhibited the following defects,
which are now fixed:
1) The last received valid SID was cached forever for the purpose of
handling future invalid SIDs - we could have received some valid
SID ages ago, then lots of speech or NO_DATA, and if we then get
an invalid SID, we would resurrect the last valid SID from ancient
history - a bad design. In our new design, we handle invalid SID
based on the current state, much like BFI.
2) GSM 06.11 spec says clearly that after the second lost SID
(received BFI=1 && TAF=1 in CN state) we need to gradually decrease
the output level, rather than jump directly to emitting silence
frames - we previously failed to implement such logic.
3) Per GSM 06.12 section 5.2, Xmaxc should be the same in all 4 subframes
in a SID frame. What should we do if we receive an otherwise valid
SID frame with different Xmaxc? Our previous approach would
replicate this Xmaxc oddity in every subsequent generated CN frame,
which is rather bad. In our new design, the very first CN frame
(which can be seen as a transformation of the SID frame itself)
retains the original 4 distinct Xmaxc, but all subsequent CN frames
are based on the Xmaxc from the last subframe of the most recent SID.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 09 May 2023 05:16:31 +0000 |
parents | 5bc228bb421e |
children |
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 |
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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 } |