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annotate src/pitch_ol.c @ 8:8b17df8f6340 default tip

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author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 17 Apr 2024 17:30:25 +0000
parents 56410792419a
children
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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 }