FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/pitch_ol.c @ 58:d285877fc4cc
libgsmefr: cod_12k2.c compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 25 Nov 2022 18:50:50 +0000 |
parents | 49dd1ac8e75b |
children | 509ba99f5136 |
rev | line source |
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1 /************************************************************************* |
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2 * |
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3 * FUNCTION: Pitch_ol |
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4 * |
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5 * PURPOSE: Compute the open loop pitch lag. |
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6 * |
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7 * DESCRIPTION: |
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8 * The open-loop pitch lag is determined based on the perceptually |
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9 * weighted speech signal. This is done in the following steps: |
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10 * - find three maxima of the correlation <sw[n],sw[n-T]> in the |
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11 * follwing three ranges of T : [18,35], [36,71], and [72, 143] |
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12 * - divide each maximum by <sw[n-t], sw[n-t]> where t is the delay at |
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13 * that maximum correlation. |
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14 * - select the delay of maximum normalized correlation (among the |
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15 * three candidates) while favoring the lower delay ranges. |
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16 * |
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17 *************************************************************************/ |
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18 |
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19 #include "typedef.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 "count.h" |
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23 #include "sig_proc.h" |
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24 |
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25 #define THRESHOLD 27853 |
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26 |
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27 /* local function */ |
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28 |
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29 static Word16 Lag_max ( /* output: lag found */ |
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30 Word16 scal_sig[], /* input : scaled signal */ |
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31 Word16 scal_fac, /* input : scaled signal factor */ |
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32 Word16 L_frame, /* input : length of frame to compute pitch */ |
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33 Word16 lag_max, /* input : maximum lag */ |
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34 Word16 lag_min, /* input : minimum lag */ |
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35 Word16 *cor_max); /* output: normalized correlation of selected lag */ |
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36 |
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37 Word16 Pitch_ol ( /* output: open loop pitch lag */ |
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38 Word16 signal[], /* input : signal used to compute the open loop pitch */ |
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39 /* signal[-pit_max] to signal[-1] should be known */ |
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40 Word16 pit_min, /* input : minimum pitch lag */ |
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41 Word16 pit_max, /* input : maximum pitch lag */ |
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42 Word16 L_frame /* input : length of frame to compute pitch */ |
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43 ) |
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44 { |
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45 Word16 i, j; |
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46 Word16 max1, max2, max3; |
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47 Word16 p_max1, p_max2, p_max3; |
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48 Word32 t0; |
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49 |
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50 /* Scaled signal */ |
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51 /* Can be allocated with memory allocation of(pit_max+L_frame) */ |
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52 |
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53 Word16 scaled_signal[512]; |
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54 Word16 *scal_sig, scal_fac; |
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55 |
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56 scal_sig = &scaled_signal[pit_max]; move16 (); |
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57 |
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58 t0 = 0L; move32 (); |
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59 for (i = -pit_max; i < L_frame; i++) |
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60 { |
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61 t0 = L_mac (t0, signal[i], signal[i]); |
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62 } |
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63 /*--------------------------------------------------------* |
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64 * Scaling of input signal. * |
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65 * * |
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66 * if Overflow -> scal_sig[i] = signal[i]>>2 * |
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67 * else if t0 < 1^22 -> scal_sig[i] = signal[i]<<2 * |
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68 * else -> scal_sig[i] = signal[i] * |
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69 *--------------------------------------------------------*/ |
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70 |
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71 /*--------------------------------------------------------* |
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72 * Verification for risk of overflow. * |
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73 *--------------------------------------------------------*/ |
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74 |
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75 test (); test (); |
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76 if (L_sub (t0, MAX_32) == 0L) /* Test for overflow */ |
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77 { |
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78 for (i = -pit_max; i < L_frame; i++) |
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79 { |
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80 scal_sig[i] = shr (signal[i], 3); move16 (); |
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81 } |
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82 scal_fac = 3; move16 (); |
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83 } |
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84 else if (L_sub (t0, (Word32) 1048576L) < (Word32) 0) |
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85 /* if (t0 < 2^20) */ |
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86 { |
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87 for (i = -pit_max; i < L_frame; i++) |
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88 { |
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89 scal_sig[i] = shl (signal[i], 3); move16 (); |
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90 } |
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91 scal_fac = -3; move16 (); |
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92 } |
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93 else |
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94 { |
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95 for (i = -pit_max; i < L_frame; i++) |
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96 { |
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97 scal_sig[i] = signal[i]; move16 (); |
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98 } |
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99 scal_fac = 0; move16 (); |
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100 } |
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101 |
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102 /*--------------------------------------------------------------------* |
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103 * The pitch lag search is divided in three sections. * |
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104 * Each section cannot have a pitch multiple. * |
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105 * We find a maximum for each section. * |
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106 * We compare the maximum of each section by favoring small lags. * |
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107 * * |
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108 * First section: lag delay = pit_max downto 4*pit_min * |
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109 * Second section: lag delay = 4*pit_min-1 downto 2*pit_min * |
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110 * Third section: lag delay = 2*pit_min-1 downto pit_min * |
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111 *-------------------------------------------------------------------*/ |
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112 |
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113 j = shl (pit_min, 2); |
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114 p_max1 = Lag_max (scal_sig, scal_fac, L_frame, pit_max, j, &max1); |
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115 |
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116 i = sub (j, 1); |
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117 j = shl (pit_min, 1); |
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118 p_max2 = Lag_max (scal_sig, scal_fac, L_frame, i, j, &max2); |
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119 |
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120 i = sub (j, 1); |
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121 p_max3 = Lag_max (scal_sig, scal_fac, L_frame, i, pit_min, &max3); |
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122 |
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123 /*--------------------------------------------------------------------* |
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124 * Compare the 3 sections maximum, and favor small lag. * |
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125 *-------------------------------------------------------------------*/ |
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126 |
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127 test (); |
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128 if (sub (mult (max1, THRESHOLD), max2) < 0) |
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129 { |
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130 max1 = max2; move16 (); |
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131 p_max1 = p_max2; move16 (); |
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132 } |
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133 test (); |
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134 if (sub (mult (max1, THRESHOLD), max3) < 0) |
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135 { |
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136 p_max1 = p_max3; move16 (); |
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137 } |
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138 return (p_max1); |
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139 } |
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140 |
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141 /************************************************************************* |
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142 * |
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143 * FUNCTION: Lag_max |
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144 * |
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145 * PURPOSE: Find the lag that has maximum correlation of scal_sig[] in a |
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146 * given delay range. |
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147 * |
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148 * DESCRIPTION: |
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149 * The correlation is given by |
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150 * cor[t] = <scal_sig[n],scal_sig[n-t]>, t=lag_min,...,lag_max |
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151 * The functions outputs the maximum correlation after normalization |
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152 * and the corresponding lag. |
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153 * |
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154 *************************************************************************/ |
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155 |
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156 static Word16 Lag_max ( /* output: lag found */ |
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157 Word16 scal_sig[], /* input : scaled signal. */ |
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158 Word16 scal_fac, /* input : scaled signal factor. */ |
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159 Word16 L_frame, /* input : length of frame to compute pitch */ |
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160 Word16 lag_max, /* input : maximum lag */ |
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161 Word16 lag_min, /* input : minimum lag */ |
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162 Word16 *cor_max) /* output: normalized correlation of selected lag */ |
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163 { |
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164 Word16 i, j; |
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165 Word16 *p, *p1; |
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166 Word32 max, t0; |
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167 Word16 max_h, max_l, ener_h, ener_l; |
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168 Word16 p_max; |
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169 |
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170 max = MIN_32; move32 (); |
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171 |
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172 for (i = lag_max; i >= lag_min; i--) |
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173 { |
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174 p = scal_sig; move16 (); |
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175 p1 = &scal_sig[-i]; move16 (); |
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176 t0 = 0; move32 (); |
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177 |
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178 for (j = 0; j < L_frame; j++, p++, p1++) |
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179 { |
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180 t0 = L_mac (t0, *p, *p1); |
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181 } |
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182 test (); |
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183 if (L_sub (t0, max) >= 0) |
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184 { |
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185 max = t0; move32 (); |
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186 p_max = i; move16 (); |
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187 } |
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188 } |
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189 |
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190 /* compute energy */ |
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191 |
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192 t0 = 0; move32 (); |
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193 p = &scal_sig[-p_max]; move16 (); |
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194 for (i = 0; i < L_frame; i++, p++) |
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195 { |
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196 t0 = L_mac (t0, *p, *p); |
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197 } |
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198 /* 1/sqrt(energy) */ |
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199 |
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200 t0 = Inv_sqrt (t0); |
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201 t0 = L_shl (t0, 1); |
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202 |
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203 /* max = max/sqrt(energy) */ |
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204 |
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205 L_Extract (max, &max_h, &max_l); |
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206 L_Extract (t0, &ener_h, &ener_l); |
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207 |
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208 t0 = Mpy_32 (max_h, max_l, ener_h, ener_l); |
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209 t0 = L_shr (t0, scal_fac); |
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210 |
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211 *cor_max = extract_h (L_shl (t0, 15)); move16 (); /* divide by 2 */ |
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212 |
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213 return (p_max); |
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214 } |