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author | kpfleming <kpfleming@f38db490-d61c-443f-a65b-d21fe96a405b> | 2006-03-03 18:13:26 +0000 |
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committer | kpfleming <kpfleming@f38db490-d61c-443f-a65b-d21fe96a405b> | 2006-03-03 18:13:26 +0000 |
commit | 67da2f8263b4e9bb5522fa59b27e143381d69774 (patch) | |
tree | e69baf2b1594606e9ea2e80d26d691a10bd23831 /1.2-netsec/codecs/ilbc/filter.h | |
parent | 187ac8fdb51443812933047136b96b5a532dd857 (diff) |
Creating tag for the release of asterisk-1.2.5
git-svn-id: http://svn.digium.com/svn/asterisk/tags/1.2.5@11747 f38db490-d61c-443f-a65b-d21fe96a405b
Diffstat (limited to '1.2-netsec/codecs/ilbc/filter.h')
-rw-r--r-- | 1.2-netsec/codecs/ilbc/filter.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/1.2-netsec/codecs/ilbc/filter.h b/1.2-netsec/codecs/ilbc/filter.h new file mode 100644 index 000000000..95d3b5445 --- /dev/null +++ b/1.2-netsec/codecs/ilbc/filter.h @@ -0,0 +1,73 @@ + +/****************************************************************** + + iLBC Speech Coder ANSI-C Source Code + + filter.h + + Copyright (C) The Internet Society (2004). + All Rights Reserved. + +******************************************************************/ + +#ifndef __iLBC_FILTER_H +#define __iLBC_FILTER_H + +void AllPoleFilter( + float *InOut, /* (i/o) on entrance InOut[-orderCoef] to + InOut[-1] contain the state of the + filter (delayed samples). InOut[0] to + InOut[lengthInOut-1] contain the filter + input, on en exit InOut[-orderCoef] to + InOut[-1] is unchanged and InOut[0] to + InOut[lengthInOut-1] contain filtered + samples */ + float *Coef,/* (i) filter coefficients, Coef[0] is assumed + to be 1.0 */ + int lengthInOut,/* (i) number of input/output samples */ + int orderCoef /* (i) number of filter coefficients */ +); + + + +void AllZeroFilter( + float *In, /* (i) In[0] to In[lengthInOut-1] contain + filter input samples */ + float *Coef,/* (i) filter coefficients (Coef[0] is assumed + to be 1.0) */ + int lengthInOut,/* (i) number of input/output samples */ + int orderCoef, /* (i) number of filter coefficients */ + float *Out /* (i/o) on entrance Out[-orderCoef] to Out[-1] + contain the filter state, on exit Out[0] + to Out[lengthInOut-1] contain filtered + samples */ +); + +void ZeroPoleFilter( + float *In, /* (i) In[0] to In[lengthInOut-1] contain filter + input samples In[-orderCoef] to In[-1] + contain state of all-zero section */ + float *ZeroCoef,/* (i) filter coefficients for all-zero + section (ZeroCoef[0] is assumed to + be 1.0) */ + float *PoleCoef,/* (i) filter coefficients for all-pole section + (ZeroCoef[0] is assumed to be 1.0) */ + int lengthInOut,/* (i) number of input/output samples */ + int orderCoef, /* (i) number of filter coefficients */ + float *Out /* (i/o) on entrance Out[-orderCoef] to Out[-1] + contain state of all-pole section. On + exit Out[0] to Out[lengthInOut-1] + contain filtered samples */ +); + +void DownSample ( + float *In, /* (i) input samples */ + float *Coef, /* (i) filter coefficients */ + int lengthIn, /* (i) number of input samples */ + float *state, /* (i) filter state */ + float *Out /* (o) downsampled output */ +); + +#endif + + |