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annotate libtwamr/lag_wind.c @ 601:c7c03231002d

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libgsmhr1: integrate main body of speech decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 12:49:19 +0000
parents a8dab7028e4d
children
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a8dab7028e4d libtwamr: integrate lag_wind.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 : lag_wind.c
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11 * Purpose : Lag windowing of autocorrelations.
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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 * MODULE INCLUDE FILE AND VERSION ID
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18 ********************************************************************************
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19 */
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20 #include "namespace.h"
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21 #include "lag_wind.h"
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22
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23 /*
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24 ********************************************************************************
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25 * INCLUDE FILES
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26 ********************************************************************************
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27 */
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28 #include "typedef.h"
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29 #include "basic_op.h"
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30 #include "oper_32b.h"
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31 #include "no_count.h"
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32
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33 /*
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34 ********************************************************************************
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35 * LOCAL VARIABLES AND TABLES
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36 ********************************************************************************
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37 */
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38 #include "lag_wind.tab" /* Table for Lag_Window() */
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39
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40 /*
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41 ********************************************************************************
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42 * PUBLIC PROGRAM CODE
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43 ********************************************************************************
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44 */
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45 /*************************************************************************
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46 *
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47 * FUNCTION: Lag_window()
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48 *
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49 * PURPOSE: Lag windowing of autocorrelations.
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50 *
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51 * DESCRIPTION:
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52 * r[i] = r[i]*lag_wind[i], i=1,...,10
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53 *
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54 * r[i] and lag_wind[i] are in special double precision format.
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55 * See "oper_32b.c" for the format.
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56 *
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57 *************************************************************************/
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58 void Lag_window (
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59 Word16 m, /* (i) : LPC order */
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60 Word16 r_h[], /* (i/o) : Autocorrelations (msb) */
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61 Word16 r_l[] /* (i/o) : Autocorrelations (lsb) */
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62 )
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63 {
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64 Word16 i;
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65 Word32 x;
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66
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67 for (i = 1; i <= m; i++)
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68 {
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69 x = Mpy_32 (r_h[i], r_l[i], lag_h[i - 1], lag_l[i - 1]);
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70 L_Extract (x, &r_h[i], &r_l[i]);
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71 }
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72 return;
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73 }