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annotate src/d_plsf_5.c @ 5:799b56cbccb6

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EFR2 decoder: add post-processing step from AMR
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 03 Apr 2024 06:09:10 +0000
parents 56410792419a
children
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1 /*************************************************************************
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2 *
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3 * FUNCTION: D_plsf_5()
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4 *
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5 * PURPOSE: Decodes the 2 sets of LSP parameters in a frame using the
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6 * received quantization indices.
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7 *
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8 * DESCRIPTION:
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9 * The two sets of LSFs are quantized using split by 5 matrix
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10 * quantization (split-MQ) with 1st order MA prediction.
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11 *
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12 * See "q_plsf_5.c" for more details about the quantization procedure
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13 *
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14 *************************************************************************/
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15
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16 #include "typedef.h"
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17 #include "basic_op.h"
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18 #include "count.h"
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19 #include "sig_proc.h"
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20
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21 #include "q_plsf_5.tab" /* Codebooks of LSF prediction residual */
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22
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23 #include "cnst.h"
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24 #include "dtx.h"
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25
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26 /* M ->order of linear prediction filter */
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27 /* LSF_GAP -> Minimum distance between LSF after quantization */
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28 /* 50 Hz = 205 */
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29 /* PRED_FAC -> Prediction factor = 0.65 */
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30 /* ALPHA -> 0.9 */
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31 /* ONE_ALPHA-> (1.0-ALPHA) */
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32
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33 #define M 10
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34 #define LSF_GAP 205
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35 #define PRED_FAC 21299
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36 #define ALPHA 31128
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37 #define ONE_ALPHA 1639
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38
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39 /* Past quantized prediction error */
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40
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41 Word16 past_r2_q[M];
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42
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43 /* Past dequantized lsfs */
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44
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45 Word16 past_lsf_q[M];
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46
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47 /* Reference LSF parameter vector (comfort noise) */
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48
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49 Word16 lsf_p_CN[M];
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50
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51 /* LSF memories for comfort noise interpolation */
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52
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53 Word16 lsf_old_CN[M], lsf_new_CN[M];
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54
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55 /* LSF parameter buffer */
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56
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57 extern Word16 lsf_old_rx[DTX_HANGOVER][M];
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58
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59 void D_plsf_5 (
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60 Word16 *indice, /* input : quantization indices of 5 submatrices */
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61 Word16 *lsp1_q, /* output: quantized 1st LSP vector */
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62 Word16 *lsp2_q, /* output: quantized 2nd LSP vector */
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63 Word16 bfi, /* input : bad frame indicator (set to 1 if a bad
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64 frame is received) */
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65 Word16 rxdtx_ctrl, /* input : RX DTX control word */
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66 Word16 rx_dtx_state /* input : state of the comfort noise insertion
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67 period */
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68 )
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69 {
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70 Word16 i;
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71 const Word16 *p_dico;
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72 Word16 temp, sign;
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73 Word16 lsf1_r[M], lsf2_r[M];
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74 Word16 lsf1_q[M], lsf2_q[M];
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75
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76 /* Update comfort noise LSF quantizer memory */
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77 test (); logic16 ();
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78 if ((rxdtx_ctrl & RX_UPD_SID_QUANT_MEM) != 0)
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79 {
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80 update_lsf_p_CN (lsf_old_rx, lsf_p_CN);
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81 }
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82 /* Handle cases of comfort noise LSF decoding in which past
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83 valid SID frames are repeated */
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84
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85 test (); logic16 ();
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86 test (); logic16 ();
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87 test (); logic16 ();
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88 if (((rxdtx_ctrl & RX_NO_TRANSMISSION) != 0)
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89 || ((rxdtx_ctrl & RX_INVALID_SID_FRAME) != 0)
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90 || ((rxdtx_ctrl & RX_LOST_SID_FRAME) != 0))
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91 {
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92
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93 test (); logic16 ();
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94 if ((rxdtx_ctrl & RX_NO_TRANSMISSION) != 0)
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95 {
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96 /* DTX active: no transmission. Interpolate LSF values in memory */
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97 interpolate_CN_lsf (lsf_old_CN, lsf_new_CN, lsf2_q, rx_dtx_state);
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98 }
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99 else
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100 { /* Invalid or lost SID frame: use LSFs
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101 from last good SID frame */
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102 for (i = 0; i < M; i++)
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103 {
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104 lsf_old_CN[i] = lsf_new_CN[i]; move16 ();
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105 lsf2_q[i] = lsf_new_CN[i]; move16 ();
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106 past_r2_q[i] = 0; move16 ();
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107 }
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108 }
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109
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110 for (i = 0; i < M; i++)
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111 {
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112 past_lsf_q[i] = lsf2_q[i]; move16 ();
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113 }
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114
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115 /* convert LSFs to the cosine domain */
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116 Lsf_lsp (lsf2_q, lsp2_q, M);
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117
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118 return;
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119 }
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120
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121 test ();
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122 if (bfi != 0) /* if bad frame */
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123 {
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124 /* use the past LSFs slightly shifted towards their mean */
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125
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126 for (i = 0; i < M; i++)
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127 {
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128 /* lsfi_q[i] = ALPHA*past_lsf_q[i] + ONE_ALPHA*mean_lsf[i]; */
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129
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130 lsf1_q[i] = add (mult (past_lsf_q[i], ALPHA),
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131 mult (mean_lsf[i], ONE_ALPHA));
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132 move16 ();
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133
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134 lsf2_q[i] = lsf1_q[i]; move16 ();
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135 }
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136
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137 /* estimate past quantized residual to be used in next frame */
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138
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139 for (i = 0; i < M; i++)
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140 {
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141 /* temp = mean_lsf[i] + past_r2_q[i] * PRED_FAC; */
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142
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parents:
diff changeset
143 temp = add (mean_lsf[i], mult (past_r2_q[i], PRED_FAC));
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 past_r2_q[i] = sub (lsf2_q[i], temp);
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 else
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 /* if good LSFs received */
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 {
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 /* decode prediction residuals from 5 received indices */
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 p_dico = &dico1_lsf[shl (indice[0], 2)];
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 lsf1_r[0] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 lsf1_r[1] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 lsf2_r[0] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 lsf2_r[1] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 p_dico = &dico2_lsf[shl (indice[1], 2)];
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 lsf1_r[2] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 lsf1_r[3] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 lsf2_r[2] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 lsf2_r[3] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 sign = indice[2] & 1; logic16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 i = shr (indice[2], 1);
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 p_dico = &dico3_lsf[shl (i, 2)]; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 test ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 if (sign == 0)
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 {
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 lsf1_r[4] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 lsf1_r[5] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 lsf2_r[4] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 lsf2_r[5] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 else
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 {
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 lsf1_r[4] = negate (*p_dico++); move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 lsf1_r[5] = negate (*p_dico++); move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 lsf2_r[4] = negate (*p_dico++); move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 lsf2_r[5] = negate (*p_dico++); move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 p_dico = &dico4_lsf[shl (indice[3], 2)];move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 lsf1_r[6] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 lsf1_r[7] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 lsf2_r[6] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 lsf2_r[7] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 p_dico = &dico5_lsf[shl (indice[4], 2)];move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 lsf1_r[8] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 lsf1_r[9] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 lsf2_r[8] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 lsf2_r[9] = *p_dico++; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 /* Compute quantized LSFs and update the past quantized residual */
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 /* Use lsf_p_CN as predicted LSF vector in case of no speech
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 activity */
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 test (); logic16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 if ((rxdtx_ctrl & RX_SP_FLAG) != 0)
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 {
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 for (i = 0; i < M; i++)
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 {
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 temp = add (mean_lsf[i], mult (past_r2_q[i], PRED_FAC));
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 lsf1_q[i] = add (lsf1_r[i], temp);
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 lsf2_q[i] = add (lsf2_r[i], temp);
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 past_r2_q[i] = lsf2_r[i]; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 else
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 { /* Valid SID frame */
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 for (i = 0; i < M; i++)
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218 {
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 lsf2_q[i] = add (lsf2_r[i], lsf_p_CN[i]);
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
220 move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222 /* Use the dequantized values of lsf2 also for lsf1 */
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 lsf1_q[i] = lsf2_q[i]; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 past_r2_q[i] = 0; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
226 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
227 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
228 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
229
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
230 /* verification that LSFs have minimum distance of LSF_GAP Hz */
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
231
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
232 Reorder_lsf (lsf1_q, LSF_GAP, M);
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
233 Reorder_lsf (lsf2_q, LSF_GAP, M);
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
234
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
235 test (); logic16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
236 if ((rxdtx_ctrl & RX_FIRST_SID_UPDATE) != 0)
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
237 {
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
238 for (i = 0; i < M; i++)
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
239 {
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
240 lsf_new_CN[i] = lsf2_q[i]; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
241 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
242 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
243 test (); logic16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
244 if ((rxdtx_ctrl & RX_CONT_SID_UPDATE) != 0)
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
245 {
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
246 for (i = 0; i < M; i++)
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
247 {
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
248 lsf_old_CN[i] = lsf_new_CN[i]; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
249 lsf_new_CN[i] = lsf2_q[i]; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
250 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
251 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
252 test (); logic16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
253 if ((rxdtx_ctrl & RX_SP_FLAG) != 0)
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
254 {
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
255 /* Update lsf history with quantized LSFs
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
256 when speech activity is present. If the current frame is
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
257 a bad one, update with most recent good comfort noise LSFs */
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
258
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
259 if (bfi==0)
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
260 {
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
261 update_lsf_history (lsf1_q, lsf2_q, lsf_old_rx);
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
262 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
263 else
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
264 {
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
265 update_lsf_history (lsf_new_CN, lsf_new_CN, lsf_old_rx);
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
266 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
267
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
268 for (i = 0; i < M; i++)
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
269 {
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
270 lsf_old_CN[i] = lsf2_q[i]; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
271 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
272 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
273 else
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
274 {
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
275 interpolate_CN_lsf (lsf_old_CN, lsf_new_CN, lsf2_q, rx_dtx_state);
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
276 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
277
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
278 for (i = 0; i < M; i++)
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
279 {
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
280 past_lsf_q[i] = lsf2_q[i]; move16 ();
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
281 }
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
282
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
283 /* convert LSFs to the cosine domain */
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
284
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
285 Lsf_lsp (lsf1_q, lsp1_q, M);
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
286 Lsf_lsp (lsf2_q, lsp2_q, M);
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
287
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
288 return;
56410792419a src: original EFR source from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
289 }