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annotate src/sig_proc.h @ 5:799b56cbccb6

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EFR2 decoder: add post-processing step from AMR
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 03 Apr 2024 06:09:10 +0000
parents 56410792419a
children
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1 /*--------------------------------------------------------------*
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2 * Function prototypes for general SIGnal PROCessing functions. *
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3 *--------------------------------------------------------------*/
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4
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5 /* Mathematic functions */
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6
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7 Word32 Inv_sqrt ( /* (o) : output value (range: 0<=val<1) */
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8 Word32 L_x /* (i) : input value (range: 0<=val<=7fffffff) */
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9 );
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10 void Log2 (
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11 Word32 L_x, /* (i) : input value */
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12 Word16 *exponent, /* (o) : Integer part of Log2. (range: 0<=val<=30) */
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13 Word16 *fraction /* (o) : Fractional part of Log2. (range: 0<=val<1)*/
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14 );
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15 Word32 Pow2 ( /* (o) : result (range: 0<=val<=0x7fffffff) */
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16 Word16 exponent, /* (i) : Integer part. (range: 0<=val<=30) */
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17 Word16 fraction /* (i) : Fractional part. (range: 0.0<=val<1.0) */
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18 );
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19
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20 /* General signal processing */
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21
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22 void Init_Pre_Process (void);
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23 void Pre_Process (
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24 Word16 signal[], /* Input/output signal */
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25 Word16 lg /* Lenght of signal */
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26 );
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27
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28 Word16 Autocorr (
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29 Word16 x[], /* (i) : Input signal */
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30 Word16 m, /* (i) : LPC order */
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31 Word16 r_h[], /* (o) : Autocorrelations (msb) */
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32 Word16 r_l[], /* (o) : Autocorrelations (lsb) */
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33 const Word16 wind[]/* (i) : window for LPC analysis. */
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34 );
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35 void Lag_window (
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36 Word16 m, /* (i) : LPC order */
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37 Word16 r_h[], /* (i/o) : Autocorrelations (msb) */
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38 Word16 r_l[] /* (i/o) : Autocorrelations (lsb) */
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39 );
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40 void Levinson (
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41 Word16 Rh[], /* (i) : Rh[m+1] Vector of autocorrelations (msb) */
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42 Word16 Rl[], /* (i) : Rl[m+1] Vector of autocorrelations (lsb) */
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43 Word16 A[], /* (o) : A[m] LPC coefficients (m = 10) */
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44 Word16 rc[] /* (o) : rc[4] First 4 reflection coefficients */
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45 );
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46 void Az_lsp (
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47 Word16 a[], /* (i) : predictor coefficients */
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48 Word16 lsp[], /* (o) : line spectral pairs */
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49 Word16 old_lsp[] /* (i) : old lsp[] (in case not found 10 roots) */
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50 );
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51 void Lsp_Az (
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52 Word16 lsp[], /* (i) : line spectral frequencies */
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53 Word16 a[] /* (o) : predictor coefficients (order = 10) */
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54 );
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55 void Lsf_lsp (
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56 Word16 lsf[], /* (i) : lsf[m] normalized (range: 0.0<=val<=0.5) */
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57 Word16 lsp[], /* (o) : lsp[m] (range: -1<=val<1) */
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58 Word16 m /* (i) : LPC order */
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59 );
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60 void Lsp_lsf (
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61 Word16 lsp[], /* (i) : lsp[m] (range: -1<=val<1) */
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62 Word16 lsf[], /* (o) : lsf[m] normalized (range: 0.0<=val<=0.5) */
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63 Word16 m /* (i) : LPC order */
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64 );
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65 void Reorder_lsf (
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66 Word16 *lsf, /* (i/o) : vector of LSFs (range: 0<=val<=0.5) */
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67 Word16 min_dist, /* (i) : minimum required distance */
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68 Word16 n /* (i) : LPC order */
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69 );
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70 void Weight_Fac (
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71 Word16 gamma, /* (i) : Spectral expansion. */
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72 Word16 fac[] /* (i/o) : Computed factors. */
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73 );
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74 void Weight_Ai (
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75 Word16 a[], /* (i) : a[m+1] LPC coefficients (m=10) */
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76 const Word16 fac[],/* (i) : Spectral expansion factors. */
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77 Word16 a_exp[] /* (o) : Spectral expanded LPC coefficients */
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78 );
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79 void Residu (
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80 Word16 a[], /* (i) : prediction coefficients */
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81 Word16 x[], /* (i) : speech signal */
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82 Word16 y[], /* (o) : residual signal */
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83 Word16 lg /* (i) : size of filtering */
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84 );
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85 void Syn_filt (
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86 Word16 a[], /* (i) : a[m+1] prediction coefficients (m=10) */
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87 Word16 x[], /* (i) : input signal */
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88 Word16 y[], /* (o) : output signal */
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89 Word16 lg, /* (i) : size of filtering */
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90 Word16 mem[], /* (i/o): memory associated with this filtering. */
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91 Word16 update /* (i) : 0=no update, 1=update of memory. */
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92 );
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93 void Convolve (
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94 Word16 x[], /* (i) : input vector */
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95 Word16 h[], /* (i) : impulse response */
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96 Word16 y[], /* (o) : output vector */
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97 Word16 L /* (i) : vector size */
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98 );
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99 void agc (
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100 Word16 *sig_in, /* (i) : postfilter input signal */
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101 Word16 *sig_out, /* (i/o): postfilter output signal */
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102 Word16 agc_fac, /* (i) : AGC factor */
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103 Word16 l_trm /* (i) : subframe size */
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104 );
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105 void agc2 (
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106 Word16 *sig_in, /* (i) : postfilter input signal */
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107 Word16 *sig_out, /* (i/o): postfilter output signal */
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108 Word16 l_trm /* (i) : subframe size */
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109 );
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110 void preemphasis (
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111 Word16 *signal, /* (i/o): input signal overwritten by the output */
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112 Word16 g, /* (i) : preemphasis coefficient */
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113 Word16 L /* (i) : size of filtering */
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114 );
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115
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116 /* General */
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117
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118 void Copy (
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119 Word16 x[], /* (i) : input vector */
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120 Word16 y[], /* (o) : output vector */
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121 Word16 L /* (i) : vector length */
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122 );
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123 void Set_zero (
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124 Word16 x[], /* (o) : vector to clear */
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125 Word16 L /* (i) : length of vector */
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126 );