FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/g_pitch.c @ 242:f081a6850fb5
libgsmfrp: new refined implementation
The previous implementation exhibited the following defects,
which are now fixed:
1) The last received valid SID was cached forever for the purpose of
handling future invalid SIDs - we could have received some valid
SID ages ago, then lots of speech or NO_DATA, and if we then get
an invalid SID, we would resurrect the last valid SID from ancient
history - a bad design. In our new design, we handle invalid SID
based on the current state, much like BFI.
2) GSM 06.11 spec says clearly that after the second lost SID
(received BFI=1 && TAF=1 in CN state) we need to gradually decrease
the output level, rather than jump directly to emitting silence
frames - we previously failed to implement such logic.
3) Per GSM 06.12 section 5.2, Xmaxc should be the same in all 4 subframes
in a SID frame. What should we do if we receive an otherwise valid
SID frame with different Xmaxc? Our previous approach would
replicate this Xmaxc oddity in every subsequent generated CN frame,
which is rather bad. In our new design, the very first CN frame
(which can be seen as a transformation of the SID frame itself)
retains the original 4 distinct Xmaxc, but all subsequent CN frames
are based on the Xmaxc from the last subframe of the most recent SID.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 09 May 2023 05:16:31 +0000 |
parents | 827661987b41 |
children |
rev | line source |
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1 /************************************************************************* |
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2 * |
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3 * FUNCTION: G_pitch |
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4 * |
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5 * PURPOSE: Compute the pitch (adaptive codebook) gain. Result in Q12 |
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6 * |
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7 * DESCRIPTION: |
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8 * The adaptive codebook gain is given by |
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9 * |
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10 * g = <x[], y[]> / <y[], y[]> |
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11 * |
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12 * where x[] is the target vector, y[] is the filtered adaptive |
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13 * codevector, and <> denotes dot product. |
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14 * The gain is limited to the range [0,1.2] |
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15 * |
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16 *************************************************************************/ |
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17 |
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18 #include "gsm_efr.h" |
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19 #include "typedef.h" |
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20 #include "namespace.h" |
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21 #include "basic_op.h" |
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22 #include "oper_32b.h" |
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23 #include "no_count.h" |
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24 #include "sig_proc.h" |
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25 #include "codec.h" |
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26 |
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27 Word16 G_pitch ( /* (o) : Gain of pitch lag saturated to 1.2 */ |
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28 Word16 xn[], /* (i) : Pitch target. */ |
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29 Word16 y1[], /* (i) : Filtered adaptive codebook. */ |
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30 Word16 L_subfr /* : Length of subframe. */ |
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31 ) |
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32 { |
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33 Word16 i; |
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34 Word16 xy, yy, exp_xy, exp_yy, gain; |
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35 Word32 s; |
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36 |
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37 Word16 scaled_y1[80]; /* Usually dynamic allocation of (L_subfr) */ |
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38 |
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39 /* divide by 2 "y1[]" to avoid overflow */ |
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40 |
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41 for (i = 0; i < L_subfr; i++) |
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42 { |
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43 scaled_y1[i] = shr (y1[i], 2); move16 (); |
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44 } |
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45 |
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46 /* Compute scalar product <y1[],y1[]> */ |
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47 |
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48 s = 0L; move32 (); /* Avoid case of all zeros */ |
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49 for (i = 0; i < L_subfr; i++) |
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50 { |
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51 s = L_mac (s, y1[i], y1[i]); |
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52 } |
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53 test (); |
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54 if (s != MAX_32) /* Test for overflow */ |
53
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55 { |
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56 s++; /* Avoid case of all zeros */ |
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57 exp_yy = norm_l (s); |
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58 yy = round (L_shl (s, exp_yy)); |
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59 } |
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60 else |
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61 { |
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62 s = 1L; move32 (); /* Avoid case of all zeros */ |
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63 for (i = 0; i < L_subfr; i++) |
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64 { |
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65 s = L_mac (s, scaled_y1[i], scaled_y1[i]); |
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66 } |
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67 exp_yy = norm_l (s); |
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68 yy = round (L_shl (s, exp_yy)); |
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69 exp_yy = sub (exp_yy, 4); |
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70 } |
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71 |
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72 /* Compute scalar product <xn[],y1[]> */ |
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73 |
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74 Overflow = 0; move16 (); |
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75 s = 1L; move32 (); /* Avoid case of all zeros */ |
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76 for (i = 0; i < L_subfr; i++) |
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77 { |
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78 Carry = 0; move16 (); |
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79 s = L_macNs (s, xn[i], y1[i]); |
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80 |
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81 test (); |
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82 if (Overflow != 0) |
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83 { |
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84 break; |
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85 } |
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86 } |
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87 test (); |
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88 if (Overflow == 0) |
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89 { |
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90 exp_xy = norm_l (s); |
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91 xy = round (L_shl (s, exp_xy)); |
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92 } |
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93 else |
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94 { |
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95 s = 1L; move32 (); /* Avoid case of all zeros */ |
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96 for (i = 0; i < L_subfr; i++) |
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97 { |
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98 s = L_mac (s, xn[i], scaled_y1[i]); |
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99 } |
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100 exp_xy = norm_l (s); |
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101 xy = round (L_shl (s, exp_xy)); |
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102 exp_xy = sub (exp_xy, 2); |
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103 } |
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104 |
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105 /* If (xy < 4) gain = 0 */ |
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106 |
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107 i = sub (xy, 4); |
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108 |
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109 test (); |
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110 if (i < 0) |
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111 return ((Word16) 0); |
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112 |
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113 /* compute gain = xy/yy */ |
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114 |
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115 xy = shr (xy, 1); /* Be sure xy < yy */ |
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116 gain = div_s (xy, yy); |
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117 |
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118 i = add (exp_xy, 3 - 1); /* Denormalization of division */ |
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119 i = sub (i, exp_yy); |
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120 |
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121 gain = shr (gain, i); |
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122 |
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123 /* if(gain >1.2) gain = 1.2 */ |
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124 |
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125 test (); |
195
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126 if (gain > 4915) |
53
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127 { |
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128 gain = 4915; move16 (); |
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129 } |
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130 return (gain); |
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131 } |