FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/inter_6.c @ 67:58b64224d4ac
libgsmefr: dtx.c compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 26 Nov 2022 05:09:07 +0000 |
parents | 49dd1ac8e75b |
children | 63ad83f3d821 |
rev | line source |
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libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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1 /************************************************************************* |
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2 * |
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3 * FUNCTION: Interpol_6() |
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4 * |
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5 * PURPOSE: Interpolating the normalized correlation with 1/6 resolution. |
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6 * |
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7 *************************************************************************/ |
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8 |
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9 #include "typedef.h" |
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10 #include "basic_op.h" |
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11 #include "count.h" |
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12 |
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13 #define UP_SAMP 6 |
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14 #define L_INTERPOL 4 |
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15 #define FIR_SIZE (UP_SAMP*L_INTERPOL+1) |
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16 |
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17 /* 1/6 resolution interpolation filter (-3 dB at 3600 Hz) */ |
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18 |
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19 static const Word16 inter_6[FIR_SIZE] = |
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20 { |
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21 29519, |
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22 28316, 24906, 19838, 13896, 7945, 2755, |
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23 -1127, -3459, -4304, -3969, -2899, -1561, |
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24 -336, 534, 970, 1023, 823, 516, |
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25 220, 0, -131, -194, -215, 0 |
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26 }; |
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27 |
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28 Word16 Interpol_6 ( /* (o) : interpolated value */ |
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29 Word16 *x, /* (i) : input vector */ |
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30 Word16 frac /* (i) : fraction */ |
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31 ) |
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32 { |
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33 Word16 i, k; |
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34 Word16 *x1, *x2; |
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35 const Word16 *c1, *c2; |
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36 Word32 s; |
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37 |
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38 test (); |
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39 if (frac < 0) |
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40 { |
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41 frac = add (frac, UP_SAMP); |
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42 x--; |
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43 } |
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44 x1 = &x[0]; move16 (); |
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45 x2 = &x[1]; move16 (); |
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46 c1 = &inter_6[frac]; move16 (); |
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47 c2 = &inter_6[sub (UP_SAMP, frac)]; move16 (); |
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48 |
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49 s = 0; move32 (); |
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50 for (i = 0, k = 0; i < L_INTERPOL; i++, k += UP_SAMP) |
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51 { |
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52 s = L_mac (s, x1[-i], c1[k]); |
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53 s = L_mac (s, x2[i], c2[k]); |
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54 } |
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55 |
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56 return round (s); |
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57 } |