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annotate libgsmefr/pitch_ol.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents 509ba99f5136
children b4531e7227ca
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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 (L_sub (t0, MAX_32) == 0L) /* 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 (L_sub (t0, (Word32) 1048576L) < (Word32) 0)
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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 ();
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131 if (sub (mult (max1, THRESHOLD), max2) < 0)
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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 (sub (mult (max1, THRESHOLD), max3) < 0)
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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 ();
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186 if (L_sub (t0, max) >= 0)
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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 }