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+
+/******************************************************************
+
+ 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
+
+