FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/calc_cor.c @ 383:838ed426bb76
libtwamr: integrate inter_36.c
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 06 May 2024 05:49:47 +0000 |
parents | 67c31802392b |
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rev | line source |
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libtwamr: integrate calc_cor.c
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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 : calc_cor.c |
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11 * Purpose : Calculate all correlations for prior the OL LTP |
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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 "calc_cor.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 #include "cnst.h" |
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34 |
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35 /* |
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36 ******************************************************************************** |
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37 * PUBLIC PROGRAM CODE |
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38 ******************************************************************************** |
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39 */ |
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40 /************************************************************************* |
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41 * |
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42 * FUNCTION: comp_corr |
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43 * |
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44 * PURPOSE: Calculate all correlations of scal_sig[] in a given delay |
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45 * range. |
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46 * |
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47 * DESCRIPTION: |
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48 * The correlation is given by |
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49 * cor[t] = <scal_sig[n],scal_sig[n-t]>, t=lag_min,...,lag_max |
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50 * The functions outputs the all correlations |
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51 * |
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52 *************************************************************************/ |
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53 void comp_corr ( |
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54 Word16 scal_sig[], /* i : scaled signal. */ |
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55 Word16 L_frame, /* i : length of frame to compute pitch */ |
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56 Word16 lag_max, /* i : maximum lag */ |
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57 Word16 lag_min, /* i : minimum lag */ |
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58 Word32 corr[]) /* o : correlation of selected lag */ |
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59 { |
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60 Word16 i, j; |
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61 Word16 *p, *p1; |
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62 Word32 t0; |
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63 |
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64 for (i = lag_max; i >= lag_min; i--) |
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65 { |
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66 p = scal_sig; move16 (); |
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67 p1 = &scal_sig[-i]; move16 (); |
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68 t0 = 0; move32 (); |
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69 |
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70 for (j = 0; j < L_frame; j++, p++, p1++) |
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71 { |
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72 t0 = L_mac (t0, *p, *p1); |
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73 } |
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74 corr[-i] = t0; move32 (); |
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75 } |
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76 |
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77 return; |
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78 } |