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2 /******************************************************************
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3
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4 iLBC Speech Coder ANSI-C Source Code
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5
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6 helpfun.h
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7
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8 Copyright (C) The Internet Society (2004).
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9 All Rights Reserved.
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10
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11 ******************************************************************/
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12
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13 #ifndef __iLBC_HELPFUN_H
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14 #define __iLBC_HELPFUN_H
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15
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16 void autocorr(float *r, /* (o) autocorrelation vector */
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17 const float *x, /* (i) data vector */
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18 int N, /* (i) length of data vector */
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19 int order /* largest lag for calculated
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20 autocorrelations */
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21 );
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22
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23 void window(float *z, /* (o) the windowed data */
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24 const float *x, /* (i) the original data vector */
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25 const float *y, /* (i) the window */
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26 int N /* (i) length of all vectors */
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27 );
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28
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29 void levdurb(float *a, /* (o) lpc coefficient vector starting
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30 with 1.0 */
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31 float *k, /* (o) reflection coefficients */
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32 float *r, /* (i) autocorrelation vector */
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33 int order /* (i) order of lpc filter */
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34 );
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35
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36 void interpolate(float *out, /* (o) the interpolated vector */
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37 float *in1, /* (i) the first vector for the
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38 interpolation */
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39 float *in2, /* (i) the second vector for the
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40 interpolation */
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41 float coef, /* (i) interpolation weights */
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42 int length /* (i) length of all vectors */
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43 );
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44
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45 void bwexpand(float *out, /* (o) the bandwidth expanded lpc
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46 coefficients */
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47 float *in, /* (i) the lpc coefficients before bandwidth
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48 expansion */
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49 float coef, /* (i) the bandwidth expansion factor */
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50 int length /* (i) the length of lpc coefficient vectors */
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51 );
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52
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53 void vq(float *Xq, /* (o) the quantized vector */
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54 int *index, /* (o) the quantization index */
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55 const float *CB, /* (i) the vector quantization codebook */
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56 float *X, /* (i) the vector to quantize */
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57 int n_cb, /* (i) the number of vectors in the codebook */
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58 int dim /* (i) the dimension of all vectors */
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59 );
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60
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61 void SplitVQ(float *qX, /* (o) the quantized vector */
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62 int *index, /* (o) a vector of indexes for all vector
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63 codebooks in the split */
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64 float *X, /* (i) the vector to quantize */
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65 const float *CB, /* (i) the quantizer codebook */
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66 int nsplit, /* the number of vector splits */
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67 const int *dim, /* the dimension of X and qX */
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68 const int *cbsize /* the number of vectors in the codebook */
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69 );
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70
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71
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72 void sort_sq(float *xq, /* (o) the quantized value */
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73 int *index, /* (o) the quantization index */
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74 float x, /* (i) the value to quantize */
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75 const float *cb, /* (i) the quantization codebook */
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76 int cb_size /* (i) the size of the quantization codebook */
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77 );
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78
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79 int LSF_check( /* (o) 1 for stable lsf vectors and 0 for
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80
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81
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82
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83
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84
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85 nonstable ones */
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86 float *lsf, /* (i) a table of lsf vectors */
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87 int dim, /* (i) the dimension of each lsf vector */
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88 int NoAn /* (i) the number of lsf vectors in the
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89 table */
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90 );
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91
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92 #endif
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