FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/int_lsf.h @ 486:f35c8fd9ceba
CHANGES: document gsmrec-dump improvements
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 20 May 2024 02:07:30 +0000 |
parents | 693ea1d5cf1e |
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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 : int_lsf.h |
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11 * Purpose : Interpolates the LSFs |
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12 * |
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13 ******************************************************************************** |
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14 */ |
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15 #ifndef int_lsf_h |
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16 #define int_lsf_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 * |
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40 * Function : Int_lsf |
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41 * Purpose : Interpolates the LSFs for selected subframe |
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42 * Description : The 20 ms speech frame is divided into 4 subframes. |
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43 * The LSFs are interpolated at the 1st, 2nd and 3rd |
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44 * subframe and only forwarded at the 4th subframe. |
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45 * |
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46 * |------|------|------|------| |
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47 * sf1 sf2 sf3 sf4 |
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48 * F0 F1 |
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49 * |
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50 * sf1: 3/4 F0 + 1/4 F1 sf3: 1/4 F0 + 3/4 F1 |
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51 * sf2: 1/2 F0 + 1/2 F1 sf4: F1 |
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52 * Returns : void |
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53 * |
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54 ************************************************************************** |
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55 */ |
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56 void Int_lsf ( |
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57 Word16 lsf_old[], /* i : LSF vector at the 4th SF of past frame */ |
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58 Word16 lsf_new[], /* i : LSF vector at the 4th SF of present frame */ |
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59 Word16 i_subfr, /* i : Pointer to current sf (equal to 0,40,80 or 120) */ |
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60 Word16 lsf_out[] /* o : interpolated LSF parameters for current sf */ |
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61 ); |
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62 |
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63 #endif |