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annotate libtwamr/pre_proc.c @ 555:62943a1ad64e

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doc/FR1-Rx-DTX-detail: grammar fix
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 11 Oct 2024 00:22:47 +0000
parents 9b699f30e6f3
children
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1 /*
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2 ********************************************************************************
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3 *
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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5 * R99 Version 3.3.0
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6 * REL-4 Version 4.1.0
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7 *
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8 ********************************************************************************
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9 *
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10 * File : pre_proc.c
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11 * Purpose : Preprocessing of input speech.
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12 *
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13 ********************************************************************************
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14 */
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15
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16 /*
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17 ********************************************************************************
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18 * MODULE INCLUDE FILE AND VERSION ID
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19 ********************************************************************************
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20 */
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21 #include "namespace.h"
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22 #include "pre_proc.h"
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23
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24 /*
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25 ********************************************************************************
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26 * INCLUDE FILES
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27 ********************************************************************************
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28 */
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29 #include "typedef.h"
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30 #include "basic_op.h"
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31 #include "oper_32b.h"
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32 #include "no_count.h"
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33
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34 /*
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35 ********************************************************************************
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36 * LOCAL VARIABLES AND TABLES
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37 ********************************************************************************
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38 */
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39 /* filter coefficients (fc = 80 Hz, coeff. b[] is divided by 2) */
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40 static const Word16 b[3] = {1899, -3798, 1899};
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41 static const Word16 a[3] = {4096, 7807, -3733};
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42
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43 /*
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44 ********************************************************************************
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45 * PUBLIC PROGRAM CODE
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46 ********************************************************************************
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47 */
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48
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49 /*************************************************************************
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50 *
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51 * Function: Pre_Process_reset
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52 * Purpose: Initializes state memory to zero
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53 *
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54 **************************************************************************
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55 */
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56 void Pre_Process_reset (Pre_ProcessState *state)
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57 {
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58 state->y2_hi = 0;
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59 state->y2_lo = 0;
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60 state->y1_hi = 0;
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61 state->y1_lo = 0;
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62 state->x0 = 0;
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63 state->x1 = 0;
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64 }
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65
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66 /*************************************************************************
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67 *
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68 * FUNCTION: Pre_Process()
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69 *
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70 * PURPOSE: Preprocessing of input speech.
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71 *
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72 * DESCRIPTION:
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73 * - 2nd order high pass filtering with cut off frequency at 80 Hz.
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74 * - Divide input by two.
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75 *
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76 *
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77 * Algorithm:
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78 *
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79 * y[i] = b[0]*x[i]/2 + b[1]*x[i-1]/2 + b[2]*x[i-2]/2
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80 * + a[1]*y[i-1] + a[2]*y[i-2];
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81 *
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82 *
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83 * Input is divided by two in the filtering process.
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84 *
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85 *************************************************************************/
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86 int Pre_Process (
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87 Pre_ProcessState *st,
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88 Word16 signal[], /* input/output signal */
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89 Word16 lg) /* lenght of signal */
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90 {
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91 Word16 i, x2;
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92 Word32 L_tmp;
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93
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94 for (i = 0; i < lg; i++)
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95 {
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96 x2 = st->x1; move16 ();
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97 st->x1 = st->x0; move16 ();
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98 st->x0 = signal[i]; move16 ();
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99
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100 /* y[i] = b[0]*x[i]/2 + b[1]*x[i-1]/2 + b140[2]*x[i-2]/2 */
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101 /* + a[1]*y[i-1] + a[2] * y[i-2]; */
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102
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103 L_tmp = Mpy_32_16 (st->y1_hi, st->y1_lo, a[1]);
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104 L_tmp = L_add (L_tmp, Mpy_32_16 (st->y2_hi, st->y2_lo, a[2]));
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105 L_tmp = L_mac (L_tmp, st->x0, b[0]);
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106 L_tmp = L_mac (L_tmp, st->x1, b[1]);
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107 L_tmp = L_mac (L_tmp, x2, b[2]);
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108 L_tmp = L_shl (L_tmp, 3);
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109 signal[i] = round (L_tmp); move16 ();
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110
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111 st->y2_hi = st->y1_hi; move16 ();
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112 st->y2_lo = st->y1_lo; move16 ();
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113 L_Extract (L_tmp, &st->y1_hi, &st->y1_lo);
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114 }
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115 return 0;
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116 }