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/********************************************************************
* *
* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
* THE GNU LESSER/LIBRARY PUBLIC LICENSE, WHICH IS INCLUDED WITH *
* THIS SOURCE. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2000 *
* by Monty <monty@xiph.org> and the XIPHOPHORUS Company *
* http://www.xiph.org/ *
* *
********************************************************************
function: Direct Form I, II IIR filters, plus some specializations
last mod: $Id: iir.h,v 1.2.2.2 2000/11/04 10:24:15 xiphmont Exp $
********************************************************************/
#ifndef _V_IIR_H_
#define _V_IIR_H_
typedef struct {
int stages;
float *coeff_A;
float *coeff_B;
float *z_A;
int ring;
float gain;
} IIR_state;
extern void IIR_init(IIR_state *s,int stages,float gain, float *A, float *B);
extern void IIR_clear(IIR_state *s);
extern float IIR_filter(IIR_state *s,float in);
extern float IIR_filter_ChebBand(IIR_state *s,float in);
extern void IIR_clamp(IIR_state *s,float thresh);
#endif
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