FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/weight_a.c @ 139:be57e06bed84

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factor out common part of gsmfr-cvt-dlcap, in prep for EFR
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 13 Dec 2022 07:03:55 +0000
parents b651adfce60d
children
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1 /*************************************************************************
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2 *
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3 * FUNCTION: Weight_Ai
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4 *
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5 * PURPOSE: Spectral expansion of LP coefficients. (order==10)
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6 *
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7 * DESCRIPTION:
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8 * a_exp[i] = a[i] * fac[i-1] ,i=1,10
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9 *
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10 *************************************************************************/
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11
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12 #include "gsm_efr.h"
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13 #include "typedef.h"
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14 #include "namespace.h"
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15 #include "basic_op.h"
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16 #include "no_count.h"
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17 #include "sig_proc.h"
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19 /* m = LPC order == 10 */
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20 #define m 10
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22 void Weight_Ai (
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23 Word16 a[], /* (i) : a[m+1] LPC coefficients (m=10) */
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24 const Word16 fac[], /* (i) : Spectral expansion factors. */
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25 Word16 a_exp[] /* (o) : Spectral expanded LPC coefficients */
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26 )
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27 {
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28 Word16 i;
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30 a_exp[0] = a[0]; move16 ();
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31 for (i = 1; i <= m; i++)
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32 {
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33 a_exp[i] = round (L_mult (a[i], fac[i - 1])); move16 ();
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34 }
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36 return;
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37 }