Mercurial > hg > audiostuff
comparison intercom/ilbc/filter.h @ 2:13be24d74cd2
import intercom-0.4.1
| author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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| date | Fri, 25 Jun 2010 09:57:52 +0200 |
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| 1:9cadc470e3da | 2:13be24d74cd2 |
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| 1 | |
| 2 /****************************************************************** | |
| 3 | |
| 4 iLBC Speech Coder ANSI-C Source Code | |
| 5 | |
| 6 filter.h | |
| 7 | |
| 8 Copyright (C) The Internet Society (2004). | |
| 9 All Rights Reserved. | |
| 10 | |
| 11 ******************************************************************/ | |
| 12 | |
| 13 | |
| 14 | |
| 15 | |
| 16 | |
| 17 | |
| 18 #ifndef __iLBC_FILTER_H | |
| 19 #define __iLBC_FILTER_H | |
| 20 | |
| 21 void AllPoleFilter(float *InOut, /* (i/o) on entrance InOut[-orderCoef] to | |
| 22 InOut[-1] contain the state of the | |
| 23 filter (delayed samples). InOut[0] to | |
| 24 InOut[lengthInOut-1] contain the filter | |
| 25 input, on en exit InOut[-orderCoef] to | |
| 26 InOut[-1] is unchanged and InOut[0] to | |
| 27 InOut[lengthInOut-1] contain filtered | |
| 28 samples */ | |
| 29 float *Coef, /* (i) filter coefficients, Coef[0] is assumed | |
| 30 to be 1.0 */ | |
| 31 int lengthInOut, /* (i) number of input/output samples */ | |
| 32 int orderCoef /* (i) number of filter coefficients */ | |
| 33 ); | |
| 34 | |
| 35 void AllZeroFilter(float *In, /* (i) In[0] to In[lengthInOut-1] contain | |
| 36 filter input samples */ | |
| 37 float *Coef, /* (i) filter coefficients (Coef[0] is assumed | |
| 38 to be 1.0) */ | |
| 39 int lengthInOut, /* (i) number of input/output samples */ | |
| 40 int orderCoef, /* (i) number of filter coefficients */ | |
| 41 float *Out /* (i/o) on entrance Out[-orderCoef] to Out[-1] | |
| 42 contain the filter state, on exit Out[0] | |
| 43 to Out[lengthInOut-1] contain filtered | |
| 44 samples */ | |
| 45 ); | |
| 46 | |
| 47 void ZeroPoleFilter(float *In, /* (i) In[0] to In[lengthInOut-1] contain filter | |
| 48 input samples In[-orderCoef] to In[-1] | |
| 49 contain state of all-zero section */ | |
| 50 float *ZeroCoef, /* (i) filter coefficients for all-zero | |
| 51 section (ZeroCoef[0] is assumed to | |
| 52 be 1.0) */ | |
| 53 float *PoleCoef, /* (i) filter coefficients for all-pole section | |
| 54 (ZeroCoef[0] is assumed to be 1.0) */ | |
| 55 int lengthInOut, /* (i) number of input/output samples */ | |
| 56 int orderCoef, /* (i) number of filter coefficients */ | |
| 57 float *Out /* (i/o) on entrance Out[-orderCoef] to Out[-1] | |
| 58 contain state of all-pole section. On | |
| 59 exit Out[0] to Out[lengthInOut-1] | |
| 60 contain filtered samples */ | |
| 61 ); | |
| 62 | |
| 63 | |
| 64 | |
| 65 | |
| 66 | |
| 67 | |
| 68 void DownSample(float *In, /* (i) input samples */ | |
| 69 float *Coef, /* (i) filter coefficients */ | |
| 70 int lengthIn, /* (i) number of input samples */ | |
| 71 float *state, /* (i) filter state */ | |
| 72 float *Out /* (o) downsampled output */ | |
| 73 ); | |
| 74 | |
| 75 #endif |