FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/pitch_f6.c @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents d714168fb6dc
children
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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 "gsm_efr.h"
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18 #include "typedef.h"
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19 #include "namespace.h"
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20 #include "basic_op.h"
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21 #include "oper_32b.h"
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22 #include "no_count.h"
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23 #include "sig_proc.h"
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24 #include "codec.h"
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25
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26 /* L_inter = Length for fractional interpolation = nb.coeff/2 */
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28 #define L_inter 4
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29
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30 /* Local functions */
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31
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32 static void Norm_Corr (Word16 exc[], Word16 xn[], Word16 h[], Word16 L_subfr,
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33 Word16 t_min, Word16 t_max, Word16 corr_norm[]);
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34
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35 Word16 Pitch_fr6 ( /* (o) : pitch period. */
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36 Word16 exc[], /* (i) : excitation buffer */
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37 Word16 xn[], /* (i) : target vector */
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38 Word16 h[], /* (i) : impulse response of synthesis and
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39 weighting filters */
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40 Word16 L_subfr, /* (i) : Length of subframe */
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41 Word16 t0_min, /* (i) : minimum value in the searched range. */
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42 Word16 t0_max, /* (i) : maximum value in the searched range. */
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43 Word16 i_subfr, /* (i) : indicator for first subframe. */
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44 Word16 *pit_frac /* (o) : chosen fraction. */
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45 )
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46 {
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47 Word16 i;
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48 Word16 t_min, t_max;
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49 Word16 max, lag, frac;
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50 Word16 *corr;
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51 Word16 corr_int;
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52 Word16 corr_v[40]; /* Total length = t0_max-t0_min+1+2*L_inter */
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53
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54 /* Find interval to compute normalized correlation */
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55
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56 t_min = sub (t0_min, L_inter);
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57 t_max = add (t0_max, L_inter);
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58
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59 corr = &corr_v[-t_min]; move16 ();
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61 /* Compute normalized correlation between target and filtered excitation */
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62
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63 Norm_Corr (exc, xn, h, L_subfr, t_min, t_max, corr);
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64
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65 /* Find integer pitch */
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66
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67 max = corr[t0_min]; move16 ();
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68 lag = t0_min; move16 ();
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69
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70 for (i = t0_min + 1; i <= t0_max; i++)
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71 {
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72 test ();
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73 if (corr[i] >= max)
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74 {
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75 max = corr[i]; move16 ();
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76 lag = i; move16 ();
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77 }
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78 }
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79
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80 /* If first subframe and lag > 94 do not search fractional pitch */
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81
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82 test (); test ();
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83 if ((i_subfr == 0) && (lag > 94))
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84 {
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85 *pit_frac = 0; move16 ();
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86 return (lag);
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87 }
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88 /* Test the fractions around T0 and choose the one which maximizes */
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89 /* the interpolated normalized correlation. */
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90
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91 max = Interpol_6 (&corr[lag], -3);
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92 frac = -3; move16 ();
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93
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94 for (i = -2; i <= 3; i++)
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95 {
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96 corr_int = Interpol_6 (&corr[lag], i); move16 ();
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97 test ();
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98 if (corr_int > max)
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99 {
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100 max = corr_int; move16 ();
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101 frac = i; move16 ();
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102 }
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103 }
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104
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105 /* Limit the fraction value in the interval [-2,-1,0,1,2,3] */
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106
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107 test ();
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108 if (frac == -3)
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109 {
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110 frac = 3; move16 ();
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111 lag = sub (lag, 1);
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112 }
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113 *pit_frac = frac; move16 ();
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114
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115 return (lag);
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116 }
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117
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118 /*************************************************************************
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119 *
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120 * FUNCTION: Norm_Corr()
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121 *
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122 * PURPOSE: Find the normalized correlation between the target vector
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123 * and the filtered past excitation.
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124 *
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125 * DESCRIPTION:
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126 * The normalized correlation is given by the correlation between the
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127 * target and filtered past excitation divided by the square root of
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128 * the energy of filtered excitation.
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129 * corr[k] = <x[], y_k[]>/sqrt(y_k[],y_k[])
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130 * where x[] is the target vector and y_k[] is the filtered past
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131 * excitation at delay k.
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132 *
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133 *************************************************************************/
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134
81
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135 static void
53
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136 Norm_Corr (Word16 exc[], Word16 xn[], Word16 h[], Word16 L_subfr,
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137 Word16 t_min, Word16 t_max, Word16 corr_norm[])
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138 {
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139 Word16 i, j, k;
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140 Word16 corr_h, corr_l, norm_h, norm_l;
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141 Word32 s;
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142
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143 /* Usally dynamic allocation of (L_subfr) */
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144 Word16 excf[80];
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145 Word16 scaling, h_fac, *s_excf, scaled_excf[80];
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146
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147 k = -t_min; move16 ();
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148
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149 /* compute the filtered excitation for the first delay t_min */
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150
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151 Convolve (&exc[k], h, excf, L_subfr);
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152
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153 /* scale "excf[]" to avoid overflow */
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154
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155 for (j = 0; j < L_subfr; j++)
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156 {
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157 scaled_excf[j] = shr (excf[j], 2); move16 ();
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158 }
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159
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160 /* Compute 1/sqrt(energy of excf[]) */
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161
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162 s = 0; move32 ();
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163 for (j = 0; j < L_subfr; j++)
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164 {
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165 s = L_mac (s, excf[j], excf[j]);
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166 }
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167 test ();
198
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168 if (s <= 67108864L) /* if (s <= 2^26) */
53
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169 {
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170 s_excf = excf; move16 ();
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171 h_fac = 15 - 12; move16 ();
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172 scaling = 0; move16 ();
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173 }
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174 else
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175 {
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176 /* "excf[]" is divided by 2 */
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177 s_excf = scaled_excf; move16 ();
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178 h_fac = 15 - 12 - 2; move16 ();
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179 scaling = 2; move16 ();
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180 }
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181
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182 /* loop for every possible period */
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183
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184 for (i = t_min; i <= t_max; i++)
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185 {
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186 /* Compute 1/sqrt(energy of excf[]) */
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187
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188 s = 0; move32 ();
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189 for (j = 0; j < L_subfr; j++)
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190 {
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191 s = L_mac (s, s_excf[j], s_excf[j]);
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192 }
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193
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194 s = Inv_sqrt (s); move16 ();
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195 L_Extract (s, &norm_h, &norm_l);
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196
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197 /* Compute correlation between xn[] and excf[] */
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198
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199 s = 0; move32 ();
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200 for (j = 0; j < L_subfr; j++)
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201 {
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202 s = L_mac (s, xn[j], s_excf[j]);
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203 }
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204 L_Extract (s, &corr_h, &corr_l);
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205
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206 /* Normalize correlation = correlation * (1/sqrt(energy)) */
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207
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208 s = Mpy_32 (corr_h, corr_l, norm_h, norm_l);
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209
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210 corr_norm[i] = extract_h (L_shl (s, 16));
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211 move16 ();
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212
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213 /* modify the filtered excitation excf[] for the next iteration */
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214
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215 test ();
198
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Mychaela Falconia <falcon@freecalypso.org>
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216 if (i != t_max)
53
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217 {
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218 k--;
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219 for (j = L_subfr - 1; j > 0; j--)
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220 {
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221 s = L_mult (exc[k], h[j]);
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222 s = L_shl (s, h_fac);
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223 s_excf[j] = add (extract_h (s), s_excf[j - 1]); move16 ();
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224 }
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225 s_excf[0] = shr (exc[k], scaling); move16 ();
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226 }
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227 }
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228 return;
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229 }