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annotate libtwamr/inter_36.tab @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents 838ed426bb76
children
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838ed426bb76 libtwamr: integrate inter_36.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 : inter_36.tab
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11 * Purpose : Tables for interpolating the normalized correlation
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12 * with 1/3 or 1/6 resolution.
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13 * $Id $
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14 *
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15 ********************************************************************************
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16 */
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17 #define FIR_SIZE (UP_SAMP_MAX*L_INTER_SRCH+1)
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18
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19 /* 1/6 resolution interpolation filter (-3 dB at 3600 Hz) */
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20 /* Note: The IS641 (7.4) 1/3 resolution filter is simply a subsampled
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21 version of the 1/6 resolution filter, i.e. it uses
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22 every second coefficient:
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23
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24 inter_3[k] = inter_6[2*k], 0 <= k <= 3*L_INTER_SRCH
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25 */
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26
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27 static const Word16 inter_6[FIR_SIZE] =
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28 {
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29 29519,
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30 28316, 24906, 19838, 13896, 7945, 2755,
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31 -1127, -3459, -4304, -3969, -2899, -1561,
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32 -336, 534, 970, 1023, 823, 516,
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33 220, 0, -131, -194, -215, 0
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34 };