FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/pitch_ol.c @ 556:18aca50d68df default tip

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doc/Calypso-TCH-downlink: update for FR1 BFI-with-data
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 11 Oct 2024 01:54:00 +0000
parents b4531e7227ca
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 "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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56 Word16 scaled_signal[512];
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57 Word16 *scal_sig, scal_fac;
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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)
53
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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 ();
199
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137 if (mult (max1, THRESHOLD) < max3)
53
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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)
53
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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 }