FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/syn_filt.c @ 72:a0a1e8de4b46
libgsmefr: int_lpc.c compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 26 Nov 2022 05:37:16 +0000 |
parents | 49dd1ac8e75b |
children | bb71c5414e71 |
rev | line source |
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libgsmefr: import most *.c files from ETSI source
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1 /************************************************************************* |
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2 * |
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3 * FUNCTION: Syn_filt: |
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4 * |
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5 * PURPOSE: Perform synthesis filtering through 1/A(z). |
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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 /* m = LPC order == 10 */ |
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14 #define m 10 |
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15 |
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16 void Syn_filt ( |
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17 Word16 a[], /* (i) : a[m+1] prediction coefficients (m=10) */ |
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18 Word16 x[], /* (i) : input signal */ |
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19 Word16 y[], /* (o) : output signal */ |
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20 Word16 lg, /* (i) : size of filtering */ |
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21 Word16 mem[], /* (i/o) : memory associated with this filtering. */ |
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22 Word16 update /* (i) : 0=no update, 1=update of memory. */ |
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23 ) |
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24 { |
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25 Word16 i, j; |
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26 Word32 s; |
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27 Word16 tmp[80]; /* This is usually done by memory allocation (lg+m) */ |
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28 Word16 *yy; |
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29 |
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30 /* Copy mem[] to yy[] */ |
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31 |
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32 yy = tmp; move16 (); |
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33 |
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34 for (i = 0; i < m; i++) |
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35 { |
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36 *yy++ = mem[i]; move16 (); |
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37 } |
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38 |
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39 /* Do the filtering. */ |
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40 |
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41 for (i = 0; i < lg; i++) |
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42 { |
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43 s = L_mult (x[i], a[0]); |
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44 for (j = 1; j <= m; j++) |
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45 { |
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46 s = L_msu (s, a[j], yy[-j]); |
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47 } |
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48 s = L_shl (s, 3); |
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49 *yy++ = round (s); move16 (); |
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50 } |
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51 |
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52 for (i = 0; i < lg; i++) |
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53 { |
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54 y[i] = tmp[i + m]; move16 (); |
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55 } |
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56 |
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57 /* Update of memory if update==1 */ |
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58 |
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59 test (); |
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60 if (update != 0) |
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61 { |
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62 for (i = 0; i < m; i++) |
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63 { |
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64 mem[i] = y[lg - m + i]; move16 (); |
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65 } |
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66 } |
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67 return; |
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68 } |