FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/autocorr.h @ 449:2af2b5c12268
Library-versions: libtwamr is officially version 1.0.0
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 10 May 2024 01:43:05 +0000 |
parents | 54f6bc41ed10 |
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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 : autocorr.h |
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11 * Purpose : Compute autocorrelations of signal with windowing |
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12 * |
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13 ******************************************************************************** |
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14 */ |
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15 #ifndef autocorr_h |
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16 #define autocorr_h "$Id $" |
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17 |
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18 /* |
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19 ******************************************************************************** |
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20 * INCLUDE FILES |
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21 ******************************************************************************** |
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22 */ |
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23 #include "typedef.h" |
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24 |
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25 /* |
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26 ******************************************************************************** |
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27 * DEFINITION OF DATA TYPES |
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28 ******************************************************************************** |
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29 */ |
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30 |
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31 /* |
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32 ******************************************************************************** |
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33 * DECLARATION OF PROTOTYPES |
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34 ******************************************************************************** |
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35 */ |
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36 /* |
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37 ************************************************************************** |
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38 * |
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39 * Function : autocorr |
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40 * Purpose : Compute autocorrelations of signal with windowing |
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41 * Description : - Windowing of input speech: s'[n] = s[n] * w[n] |
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42 * - Autocorrelations of input speech: |
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43 * r[k] = sum_{i=k}^{239} s'[i]*s'[i-k] k=0,...,10 |
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44 * The autocorrelations are expressed in normalized |
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45 * double precision format. |
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46 * Returns : Autocorrelation |
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47 * |
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48 ************************************************************************** |
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49 */ |
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50 Word16 Autocorr ( |
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51 Word16 x[], /* (i) : Input signal (L_WINDOW) */ |
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52 Word16 m, /* (i) : LPC order */ |
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53 Word16 r_h[], /* (o) : Autocorrelations (msb) (MP1) */ |
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54 Word16 r_l[], /* (o) : Autocorrelations (lsb) (MP1) */ |
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55 const Word16 wind[]/* (i) : window for LPC analysis. (L_WINDOW) */ |
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56 ); |
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57 |
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58 #endif |