1 /********************************************************************
3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
5 * THE GNU LESSER/LIBRARY PUBLIC LICENSE, WHICH IS INCLUDED WITH *
6 * THIS SOURCE. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2000 *
9 * by Monty <monty@xiph.org> and the XIPHOPHORUS Company *
10 * http://www.xiph.org/ *
12 ********************************************************************
14 function: Direct Form I, II IIR filters, plus some specializations
15 last mod: $Id: iir.h,v 1.4 2000/11/07 09:51:43 xiphmont Exp $
17 ********************************************************************/
31 extern void IIR_init(IIR_state *s,int stages,float gain, float *A, float *B);
32 extern void IIR_clear(IIR_state *s);
33 extern float IIR_filter(IIR_state *s,float in);
34 extern float IIR_filter_ChebBand(IIR_state *s,float in);
35 extern void IIR_reset(IIR_state *s);