FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/lag_wind.c @ 100:d5bab777865a

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gsmefr-decode utility written
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 26 Nov 2022 22:07:55 +0000
parents 8d63b167a5d3
children
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1 /*************************************************************************
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2 *
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3 * FUNCTION: Lag_window()
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4 *
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5 * PURPOSE: Lag windowing of autocorrelations.
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6 *
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7 * DESCRIPTION:
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8 * r[i] = r[i]*lag_wind[i], i=1,...,10
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9 *
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10 * r[i] and lag_wind[i] are in special double precision format.
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11 * See "oper_32b.c" for the format.
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12 *
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13 *************************************************************************/
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14
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15 #include "gsm_efr.h"
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16 #include "typedef.h"
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17 #include "namespace.h"
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18 #include "basic_op.h"
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19 #include "oper_32b.h"
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20 #include "no_count.h"
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21 #include "sig_proc.h"
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23 #include "lag_wind.tab"
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25 void Lag_window (
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26 Word16 m, /* (i) : LPC order */
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27 Word16 r_h[], /* (i/o) : Autocorrelations (msb) */
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28 Word16 r_l[] /* (i/o) : Autocorrelations (lsb) */
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29 )
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30 {
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31 Word16 i;
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32 Word32 x;
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33
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34 for (i = 1; i <= m; i++)
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35 {
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36 x = Mpy_32 (r_h[i], r_l[i], lag_h[i - 1], lag_l[i - 1]);
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37 L_Extract (x, &r_h[i], &r_l[i]);
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38 }
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39 return;
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40 }