FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/int_lpc.c @ 148:bbe5669f0f29
gsmefr-cod-parse: add BE support
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Wed, 14 Dec 2022 17:21:05 +0000 |
parents | a0a1e8de4b46 |
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rev | line source |
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1 /************************************************************************* |
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2 * |
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3 * FUNCTION: Int_lpc() |
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4 * |
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5 * PURPOSE: Interpolates the LSPs and converts to LPC parameters to get |
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6 * a different LP filter in each subframe. |
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7 * |
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8 * DESCRIPTION: |
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9 * The 20 ms speech frame is divided into 4 subframes. |
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10 * The LSPs are quantized and transmitted at the 2nd and 4th subframes |
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11 * (twice per frame) and interpolated at the 1st and 3rd subframe. |
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12 * |
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13 * |------|------|------|------| |
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14 * sf1 sf2 sf3 sf4 |
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15 * F0 Fm F1 |
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16 * |
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17 * sf1: 1/2 Fm + 1/2 F0 sf3: 1/2 F1 + 1/2 Fm |
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18 * sf2: Fm sf4: F1 |
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19 * |
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20 *************************************************************************/ |
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21 |
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22 #include "gsm_efr.h" |
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23 #include "typedef.h" |
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24 #include "namespace.h" |
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25 #include "basic_op.h" |
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26 #include "no_count.h" |
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27 #include "sig_proc.h" |
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28 #include "codec.h" |
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29 |
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30 #define M 10 /* LP order */ |
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31 #define MP1 11 /* M+1 */ |
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32 |
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33 void Int_lpc ( |
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34 Word16 lsp_old[], /* input : LSP vector at the 4th subframe |
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35 of past frame */ |
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36 Word16 lsp_mid[], /* input : LSP vector at the 2nd subframe |
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37 of present frame */ |
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38 Word16 lsp_new[], /* input : LSP vector at the 4th subframe of |
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39 present frame */ |
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40 Word16 Az[] /* output: interpolated LP parameters in |
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41 all subframes */ |
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42 ) |
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43 { |
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44 Word16 i; |
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45 Word16 lsp[M]; |
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46 |
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47 /* lsp[i] = lsp_mid[i] * 0.5 + lsp_old[i] * 0.5 */ |
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48 |
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49 for (i = 0; i < M; i++) |
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50 { |
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51 lsp[i] = add (shr (lsp_mid[i], 1), shr (lsp_old[i], 1)); |
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52 move16 (); |
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53 } |
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54 |
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55 Lsp_Az (lsp, Az); /* Subframe 1 */ |
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56 Az += MP1; move16 (); |
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57 |
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58 Lsp_Az (lsp_mid, Az); /* Subframe 2 */ |
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59 Az += MP1; move16 (); |
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60 |
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61 for (i = 0; i < M; i++) |
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62 { |
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63 lsp[i] = add (shr (lsp_mid[i], 1), shr (lsp_new[i], 1)); |
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64 move16 (); |
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65 } |
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66 |
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67 Lsp_Az (lsp, Az); /* Subframe 3 */ |
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68 Az += MP1; move16 (); |
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69 |
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70 Lsp_Az (lsp_new, Az); /* Subframe 4 */ |
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71 |
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72 return; |
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73 } |
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74 |
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75 /*----------------------------------------------------------------------* |
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76 * Function Int_lpc2() * |
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77 * ~~~~~~~~~~~~~~~~~~ * |
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78 * Interpolation of the LPC parameters. * |
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79 * Same as the previous function but we do not recompute Az() for * |
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80 * subframe 2 and 4 because it is already available. * |
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81 *----------------------------------------------------------------------*/ |
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82 |
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83 void Int_lpc2 ( |
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84 Word16 lsp_old[], /* input : LSP vector at the 4th subframe |
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85 of past frame */ |
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86 Word16 lsp_mid[], /* input : LSP vector at the 2nd subframe |
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87 of present frame */ |
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88 Word16 lsp_new[], /* input : LSP vector at the 4th subframe of |
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89 present frame */ |
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90 Word16 Az[] /* output: interpolated LP parameters |
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91 in subframes 1 and 3 */ |
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92 ) |
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93 { |
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94 Word16 i; |
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95 Word16 lsp[M]; |
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96 |
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97 /* lsp[i] = lsp_mid[i] * 0.5 + lsp_old[i] * 0.5 */ |
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98 |
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99 for (i = 0; i < M; i++) |
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100 { |
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101 lsp[i] = add (shr (lsp_mid[i], 1), shr (lsp_old[i], 1)); |
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102 move16 (); |
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103 } |
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104 Lsp_Az (lsp, Az); /* Subframe 1 */ |
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105 Az += MP1 * 2; move16 (); |
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106 |
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107 for (i = 0; i < M; i++) |
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108 { |
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109 lsp[i] = add (shr (lsp_mid[i], 1), shr (lsp_new[i], 1)); |
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110 move16 (); |
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111 } |
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parents:
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112 Lsp_Az (lsp, Az); /* Subframe 3 */ |
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113 |
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libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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114 return; |
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libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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115 } |