FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/pitch_f6.c @ 53:49dd1ac8e75b

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libgsmefr: import most *.c files from ETSI source
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 25 Nov 2022 16:18:21 +0000
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children e0e53bfe1a8a
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1 /*************************************************************************
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2 *
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3 * FUNCTION: Pitch_fr6()
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4 *
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5 * PURPOSE: Find the pitch period with 1/6 subsample resolution (closed loop).
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6 *
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7 * DESCRIPTION:
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8 * - find the normalized correlation between the target and filtered
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9 * past excitation in the search range.
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10 * - select the delay with maximum normalized correlation.
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11 * - interpolate the normalized correlation at fractions -3/6 to 3/6
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12 * with step 1/6 around the chosen delay.
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13 * - The fraction which gives the maximum interpolated value is chosen.
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14 *
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15 *************************************************************************/
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16
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17 #include "typedef.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 "count.h"
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21 #include "sig_proc.h"
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22 #include "codec.h"
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23
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24 /* L_inter = Length for fractional interpolation = nb.coeff/2 */
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25
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26 #define L_inter 4
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27
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28 /* Local functions */
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29
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30 void Norm_Corr (Word16 exc[], Word16 xn[], Word16 h[], Word16 L_subfr,
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31 Word16 t_min, Word16 t_max, Word16 corr_norm[]);
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32
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33 Word16 Pitch_fr6 ( /* (o) : pitch period. */
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34 Word16 exc[], /* (i) : excitation buffer */
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35 Word16 xn[], /* (i) : target vector */
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36 Word16 h[], /* (i) : impulse response of synthesis and
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37 weighting filters */
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38 Word16 L_subfr, /* (i) : Length of subframe */
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39 Word16 t0_min, /* (i) : minimum value in the searched range. */
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40 Word16 t0_max, /* (i) : maximum value in the searched range. */
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41 Word16 i_subfr, /* (i) : indicator for first subframe. */
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42 Word16 *pit_frac /* (o) : chosen fraction. */
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43 )
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44 {
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45 Word16 i;
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46 Word16 t_min, t_max;
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47 Word16 max, lag, frac;
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48 Word16 *corr;
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49 Word16 corr_int;
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50 Word16 corr_v[40]; /* Total length = t0_max-t0_min+1+2*L_inter */
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51
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52 /* Find interval to compute normalized correlation */
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53
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54 t_min = sub (t0_min, L_inter);
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55 t_max = add (t0_max, L_inter);
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56
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57 corr = &corr_v[-t_min]; move16 ();
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58
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59 /* Compute normalized correlation between target and filtered excitation */
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60
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61 Norm_Corr (exc, xn, h, L_subfr, t_min, t_max, corr);
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62
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63 /* Find integer pitch */
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64
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65 max = corr[t0_min]; move16 ();
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66 lag = t0_min; move16 ();
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67
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68 for (i = t0_min + 1; i <= t0_max; i++)
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69 {
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70 test ();
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71 if (sub (corr[i], max) >= 0)
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72 {
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73 max = corr[i]; move16 ();
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74 lag = i; move16 ();
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75 }
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76 }
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77
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78 /* If first subframe and lag > 94 do not search fractional pitch */
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79
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80 test (); test ();
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81 if ((i_subfr == 0) && (sub (lag, 94) > 0))
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82 {
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83 *pit_frac = 0; move16 ();
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84 return (lag);
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85 }
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86 /* Test the fractions around T0 and choose the one which maximizes */
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87 /* the interpolated normalized correlation. */
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88
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89 max = Interpol_6 (&corr[lag], -3);
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90 frac = -3; move16 ();
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91
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92 for (i = -2; i <= 3; i++)
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93 {
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94 corr_int = Interpol_6 (&corr[lag], i); move16 ();
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95 test ();
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96 if (sub (corr_int, max) > 0)
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97 {
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98 max = corr_int; move16 ();
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99 frac = i; move16 ();
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100 }
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101 }
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102
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103 /* Limit the fraction value in the interval [-2,-1,0,1,2,3] */
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104
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105 test ();
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106 if (sub (frac, -3) == 0)
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107 {
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108 frac = 3; move16 ();
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109 lag = sub (lag, 1);
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110 }
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111 *pit_frac = frac; move16 ();
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112
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113 return (lag);
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114 }
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115
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116 /*************************************************************************
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117 *
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118 * FUNCTION: Norm_Corr()
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119 *
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120 * PURPOSE: Find the normalized correlation between the target vector
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121 * and the filtered past excitation.
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122 *
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123 * DESCRIPTION:
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124 * The normalized correlation is given by the correlation between the
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125 * target and filtered past excitation divided by the square root of
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126 * the energy of filtered excitation.
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127 * corr[k] = <x[], y_k[]>/sqrt(y_k[],y_k[])
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128 * where x[] is the target vector and y_k[] is the filtered past
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129 * excitation at delay k.
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130 *
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131 *************************************************************************/
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132
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133 void
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134 Norm_Corr (Word16 exc[], Word16 xn[], Word16 h[], Word16 L_subfr,
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135 Word16 t_min, Word16 t_max, Word16 corr_norm[])
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136 {
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137 Word16 i, j, k;
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138 Word16 corr_h, corr_l, norm_h, norm_l;
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139 Word32 s;
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140
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141 /* Usally dynamic allocation of (L_subfr) */
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142 Word16 excf[80];
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143 Word16 scaling, h_fac, *s_excf, scaled_excf[80];
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144
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145 k = -t_min; move16 ();
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146
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147 /* compute the filtered excitation for the first delay t_min */
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148
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149 Convolve (&exc[k], h, excf, L_subfr);
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150
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151 /* scale "excf[]" to avoid overflow */
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152
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153 for (j = 0; j < L_subfr; j++)
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154 {
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155 scaled_excf[j] = shr (excf[j], 2); move16 ();
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156 }
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157
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158 /* Compute 1/sqrt(energy of excf[]) */
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159
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160 s = 0; move32 ();
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161 for (j = 0; j < L_subfr; j++)
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162 {
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163 s = L_mac (s, excf[j], excf[j]);
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164 }
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165 test ();
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166 if (L_sub (s, 67108864L) <= 0) /* if (s <= 2^26) */
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167 {
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168 s_excf = excf; move16 ();
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169 h_fac = 15 - 12; move16 ();
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170 scaling = 0; move16 ();
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171 }
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172 else
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173 {
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174 /* "excf[]" is divided by 2 */
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175 s_excf = scaled_excf; move16 ();
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176 h_fac = 15 - 12 - 2; move16 ();
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177 scaling = 2; move16 ();
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178 }
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179
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180 /* loop for every possible period */
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181
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182 for (i = t_min; i <= t_max; i++)
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183 {
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184 /* Compute 1/sqrt(energy of excf[]) */
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185
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186 s = 0; move32 ();
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187 for (j = 0; j < L_subfr; j++)
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188 {
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189 s = L_mac (s, s_excf[j], s_excf[j]);
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190 }
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191
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192 s = Inv_sqrt (s); move16 ();
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193 L_Extract (s, &norm_h, &norm_l);
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194
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195 /* Compute correlation between xn[] and excf[] */
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196
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197 s = 0; move32 ();
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198 for (j = 0; j < L_subfr; j++)
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199 {
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200 s = L_mac (s, xn[j], s_excf[j]);
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201 }
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202 L_Extract (s, &corr_h, &corr_l);
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203
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204 /* Normalize correlation = correlation * (1/sqrt(energy)) */
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205
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206 s = Mpy_32 (corr_h, corr_l, norm_h, norm_l);
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207
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208 corr_norm[i] = extract_h (L_shl (s, 16));
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209 move16 ();
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210
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211 /* modify the filtered excitation excf[] for the next iteration */
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212
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213 test ();
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214 if (sub (i, t_max) != 0)
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215 {
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216 k--;
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217 for (j = L_subfr - 1; j > 0; j--)
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218 {
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219 s = L_mult (exc[k], h[j]);
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220 s = L_shl (s, h_fac);
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221 s_excf[j] = add (extract_h (s), s_excf[j - 1]); move16 ();
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222 }
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223 s_excf[0] = shr (exc[k], scaling); move16 ();
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224 }
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225 }
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226 return;
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227 }