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annotate src/weight_a.c @ 5:799b56cbccb6

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EFR2 decoder: add post-processing step from AMR
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 03 Apr 2024 06:09:10 +0000
parents 56410792419a
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 "typedef.h"
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13 #include "basic_op.h"
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14 #include "count.h"
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15
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16 /* m = LPC order == 10 */
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17 #define m 10
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18
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19 void Weight_Ai (
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20 Word16 a[], /* (i) : a[m+1] LPC coefficients (m=10) */
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21 Word16 fac[], /* (i) : Spectral expansion factors. */
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22 Word16 a_exp[] /* (o) : Spectral expanded LPC coefficients */
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23 )
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24 {
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25 Word16 i;
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26
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27 a_exp[0] = a[0]; move16 ();
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28 for (i = 1; i <= m; i++)
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29 {
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30 a_exp[i] = round (L_mult (a[i], fac[i - 1])); move16 ();
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31 }
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32
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33 return;
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34 }