1 /********************************************************************
3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001 *
9 * by the XIPHOPHORUS Company http://www.xiph.org/ *
11 ********************************************************************
13 function: Direct Form I, II IIR filters, plus some specializations
14 last mod: $Id: iir.h,v 1.7 2001/02/26 03:50:41 xiphmont Exp $
16 ********************************************************************/
30 extern void IIR_init(IIR_state *s,int stages,float gain, float *A, float *B);
31 extern void IIR_clear(IIR_state *s);
32 extern float IIR_filter(IIR_state *s,float in);
33 extern float IIR_filter_Band(IIR_state *s,float in);
34 extern void IIR_reset(IIR_state *s);