FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/c2_9pf.h @ 447:426c04621b51
libtwamr/Makefile: enable install
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 10 May 2024 01:28:39 +0000 |
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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 : c2_9pf.h |
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11 * Purpose : Searches a 9 bit algebraic codebook containing |
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12 * 2 pulses in a frame of 40 samples. |
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13 * |
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14 ***************************************************************************** |
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15 */ |
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16 #ifndef c2_9pf_h |
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17 #define c2_9pf_h "$Id $" |
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18 |
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19 /* |
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20 ***************************************************************************** |
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21 * INCLUDE FILES |
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22 ***************************************************************************** |
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23 */ |
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24 #include "typedef.h" |
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25 |
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26 /* |
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27 ***************************************************************************** |
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28 * LOCAL VARIABLES AND TABLES |
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29 ***************************************************************************** |
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30 */ |
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31 |
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32 /* |
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33 ***************************************************************************** |
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34 * DEFINITION OF DATA TYPES |
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35 ***************************************************************************** |
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36 */ |
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37 |
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38 /* |
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39 ***************************************************************************** |
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40 * DECLARATION OF PROTOTYPES |
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41 ***************************************************************************** |
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42 */ |
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43 /************************************************************************* |
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44 * |
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45 * FUNCTION: code_2i40_9bits() |
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46 * |
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47 * PURPOSE: Searches a 9 bit algebraic codebook containing 2 pulses |
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48 * in a frame of 40 samples. |
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49 * |
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50 * DESCRIPTION: |
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51 * The code length is 40, containing 2 nonzero pulses: i0...i1. |
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52 * All pulses can have two possible amplitudes: +1 or -1. |
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53 * Pulse i0 can have 8 possible positions, pulse i1 can have |
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54 * 8 positions. Also coded is which track pair should be used, |
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55 * i.e. first or second pair. Where each pair contains 2 tracks. |
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56 * |
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57 * First subframe: |
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58 * first i0 : 0, 5, 10, 15, 20, 25, 30, 35. |
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59 * i1 : 2, 7, 12, 17, 22, 27, 32, 37. |
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60 * second i0 : 1, 6, 11, 16, 21, 26, 31, 36. |
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61 * i1 : 3, 8, 13, 18, 23, 28, 33, 38. |
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62 * |
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63 * Second subframe: |
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64 * first i0 : 0, 5, 10, 15, 20, 25, 30, 35. |
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65 * i1 : 3, 8, 13, 18, 23, 28, 33, 38. |
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66 * second i0 : 2, 7, 12, 17, 22, 27, 32, 37. |
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67 * i1 : 4, 9, 14, 19, 24, 29, 34, 39. |
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68 * |
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69 * Third subframe: |
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70 * first i0 : 0, 5, 10, 15, 20, 25, 30, 35. |
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71 * i1 : 2, 7, 12, 17, 22, 27, 32, 37. |
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72 * second i0 : 1, 6, 11, 16, 21, 26, 31, 36. |
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73 * i1 : 4, 9, 14, 19, 24, 29, 34, 39. |
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74 * |
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75 * Fourth subframe: |
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76 * first i0 : 0, 5, 10, 15, 20, 25, 30, 35. |
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77 * i1 : 3, 8, 13, 18, 23, 28, 33, 38. |
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78 * second i0 : 1, 6, 11, 16, 21, 26, 31, 36. |
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79 * i1 : 4, 9, 14, 19, 24, 29, 34, 39. |
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80 * |
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81 *************************************************************************/ |
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82 |
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83 Word16 code_2i40_9bits( |
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84 Word16 subNr, /* i : subframe number */ |
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85 Word16 x[], /* i : target vector */ |
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86 Word16 h[], /* i : impulse response of weighted synthesis filter */ |
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87 /* h[-L_subfr..-1] must be set to zero. */ |
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88 Word16 T0, /* i : Pitch lag */ |
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89 Word16 pitch_sharp, /* i : Last quantized pitch gain */ |
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90 Word16 code[], /* o : Innovative codebook */ |
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91 Word16 y[], /* o : filtered fixed codebook excitation */ |
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92 Word16 * sign /* o : Signs of 2 pulses */ |
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93 ); |
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94 |
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95 #endif |