FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/pitch_ol.c @ 465:026bdc1f0dda
amrefr-tseq-enc: use the new DHF xform that matches T-Mobile
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 12 May 2024 21:43:35 +0000 |
parents | b4531e7227ca |
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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 "gsm_efr.h" |
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20 #include "typedef.h" |
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21 #include "namespace.h" |
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22 #include "basic_op.h" |
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23 #include "oper_32b.h" |
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24 #include "no_count.h" |
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25 #include "sig_proc.h" |
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26 #include "codec.h" |
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27 |
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28 #define THRESHOLD 27853 |
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29 |
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30 /* local function */ |
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31 |
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32 static Word16 Lag_max ( /* output: lag found */ |
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33 Word16 scal_sig[], /* input : scaled signal */ |
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34 Word16 scal_fac, /* input : scaled signal factor */ |
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35 Word16 L_frame, /* input : length of frame to compute pitch */ |
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36 Word16 lag_max, /* input : maximum lag */ |
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37 Word16 lag_min, /* input : minimum lag */ |
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38 Word16 *cor_max); /* output: normalized correlation of selected lag */ |
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39 |
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40 Word16 Pitch_ol ( /* output: open loop pitch lag */ |
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41 Word16 signal[], /* input : signal used to compute the open loop pitch */ |
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42 /* signal[-pit_max] to signal[-1] should be known */ |
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43 Word16 pit_min, /* input : minimum pitch lag */ |
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44 Word16 pit_max, /* input : maximum pitch lag */ |
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45 Word16 L_frame /* input : length of frame to compute pitch */ |
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46 ) |
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47 { |
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48 Word16 i, j; |
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49 Word16 max1, max2, max3; |
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50 Word16 p_max1, p_max2, p_max3; |
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51 Word32 t0; |
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52 |
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53 /* Scaled signal */ |
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54 /* Can be allocated with memory allocation of(pit_max+L_frame) */ |
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55 |
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56 Word16 scaled_signal[512]; |
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57 Word16 *scal_sig, scal_fac; |
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58 |
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59 scal_sig = &scaled_signal[pit_max]; move16 (); |
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60 |
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61 t0 = 0L; move32 (); |
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62 for (i = -pit_max; i < L_frame; i++) |
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63 { |
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64 t0 = L_mac (t0, signal[i], signal[i]); |
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65 } |
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66 /*--------------------------------------------------------* |
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67 * Scaling of input signal. * |
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68 * * |
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69 * if Overflow -> scal_sig[i] = signal[i]>>2 * |
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70 * else if t0 < 1^22 -> scal_sig[i] = signal[i]<<2 * |
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71 * else -> scal_sig[i] = signal[i] * |
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72 *--------------------------------------------------------*/ |
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73 |
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74 /*--------------------------------------------------------* |
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75 * Verification for risk of overflow. * |
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76 *--------------------------------------------------------*/ |
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77 |
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78 test (); test (); |
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79 if (t0 == MAX_32) /* Test for overflow */ |
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80 { |
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81 for (i = -pit_max; i < L_frame; i++) |
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82 { |
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83 scal_sig[i] = shr (signal[i], 3); move16 (); |
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84 } |
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85 scal_fac = 3; move16 (); |
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86 } |
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87 else if (t0 < (Word32) 1048576L) |
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88 /* if (t0 < 2^20) */ |
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89 { |
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90 for (i = -pit_max; i < L_frame; i++) |
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91 { |
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92 scal_sig[i] = shl (signal[i], 3); move16 (); |
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93 } |
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94 scal_fac = -3; move16 (); |
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95 } |
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96 else |
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97 { |
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98 for (i = -pit_max; i < L_frame; i++) |
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99 { |
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100 scal_sig[i] = signal[i]; move16 (); |
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101 } |
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102 scal_fac = 0; move16 (); |
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103 } |
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104 |
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105 /*--------------------------------------------------------------------* |
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106 * The pitch lag search is divided in three sections. * |
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107 * Each section cannot have a pitch multiple. * |
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108 * We find a maximum for each section. * |
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109 * We compare the maximum of each section by favoring small lags. * |
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110 * * |
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111 * First section: lag delay = pit_max downto 4*pit_min * |
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112 * Second section: lag delay = 4*pit_min-1 downto 2*pit_min * |
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113 * Third section: lag delay = 2*pit_min-1 downto pit_min * |
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114 *-------------------------------------------------------------------*/ |
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115 |
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116 j = shl (pit_min, 2); |
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117 p_max1 = Lag_max (scal_sig, scal_fac, L_frame, pit_max, j, &max1); |
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118 |
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119 i = sub (j, 1); |
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120 j = shl (pit_min, 1); |
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121 p_max2 = Lag_max (scal_sig, scal_fac, L_frame, i, j, &max2); |
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122 |
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123 i = sub (j, 1); |
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124 p_max3 = Lag_max (scal_sig, scal_fac, L_frame, i, pit_min, &max3); |
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125 |
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126 /*--------------------------------------------------------------------* |
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127 * Compare the 3 sections maximum, and favor small lag. * |
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128 *-------------------------------------------------------------------*/ |
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129 |
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130 test (); |
199
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131 if (mult (max1, THRESHOLD) < max2) |
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132 { |
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133 max1 = max2; move16 (); |
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134 p_max1 = p_max2; move16 (); |
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135 } |
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136 test (); |
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137 if (mult (max1, THRESHOLD) < max3) |
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138 { |
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139 p_max1 = p_max3; move16 (); |
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140 } |
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141 return (p_max1); |
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142 } |
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143 |
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144 /************************************************************************* |
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145 * |
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146 * FUNCTION: Lag_max |
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147 * |
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148 * PURPOSE: Find the lag that has maximum correlation of scal_sig[] in a |
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149 * given delay range. |
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150 * |
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151 * DESCRIPTION: |
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152 * The correlation is given by |
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153 * cor[t] = <scal_sig[n],scal_sig[n-t]>, t=lag_min,...,lag_max |
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154 * The functions outputs the maximum correlation after normalization |
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155 * and the corresponding lag. |
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156 * |
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157 *************************************************************************/ |
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158 |
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159 static Word16 Lag_max ( /* output: lag found */ |
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160 Word16 scal_sig[], /* input : scaled signal. */ |
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161 Word16 scal_fac, /* input : scaled signal factor. */ |
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162 Word16 L_frame, /* input : length of frame to compute pitch */ |
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163 Word16 lag_max, /* input : maximum lag */ |
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164 Word16 lag_min, /* input : minimum lag */ |
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165 Word16 *cor_max) /* output: normalized correlation of selected lag */ |
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166 { |
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167 Word16 i, j; |
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168 Word16 *p, *p1; |
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169 Word32 max, t0; |
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170 Word16 max_h, max_l, ener_h, ener_l; |
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171 Word16 p_max; |
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172 |
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173 max = MIN_32; move32 (); |
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174 |
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175 for (i = lag_max; i >= lag_min; i--) |
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176 { |
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177 p = scal_sig; move16 (); |
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178 p1 = &scal_sig[-i]; move16 (); |
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179 t0 = 0; move32 (); |
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180 |
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181 for (j = 0; j < L_frame; j++, p++, p1++) |
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182 { |
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183 t0 = L_mac (t0, *p, *p1); |
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184 } |
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185 test (); |
199
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186 if (t0 >= max) |
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187 { |
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188 max = t0; move32 (); |
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189 p_max = i; move16 (); |
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190 } |
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191 } |
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192 |
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193 /* compute energy */ |
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194 |
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195 t0 = 0; move32 (); |
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196 p = &scal_sig[-p_max]; move16 (); |
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197 for (i = 0; i < L_frame; i++, p++) |
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198 { |
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199 t0 = L_mac (t0, *p, *p); |
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200 } |
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201 /* 1/sqrt(energy) */ |
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202 |
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203 t0 = Inv_sqrt (t0); |
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204 t0 = L_shl (t0, 1); |
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205 |
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206 /* max = max/sqrt(energy) */ |
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207 |
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208 L_Extract (max, &max_h, &max_l); |
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209 L_Extract (t0, &ener_h, &ener_l); |
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210 |
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211 t0 = Mpy_32 (max_h, max_l, ener_h, ener_l); |
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212 t0 = L_shr (t0, scal_fac); |
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213 |
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214 *cor_max = extract_h (L_shl (t0, 15)); move16 (); /* divide by 2 */ |
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215 |
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216 return (p_max); |
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217 } |