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    Copyright (C) 1996, 1997 Perry Cook, John ffitch

    This file is part of Csound.

    The Csound Library is free software; you can redistribute it
    and/or modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    Csound is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with Csound; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA

/*  One Zero Filter Class,                 */
/*  by Perry R. Cook, 1995-96              */
/*  The parameter gain is an additional    */
/*  gain parameter applied to the filter   */
/*  on top of the normalization that takes */
/*  place automatically.  So the net max   */
/*  gain through the system equals the     */
/*  value of gain.  sgain is the combina-  */
/*  tion of gain and the normalization     */
/*  parameter, so if you set the poleCoeff */
/*  to alpha, sgain is always set to       */
/*  gain / (1.0 - fabs(alpha)).            */

#if !defined(__OneZero_h)
#define __OneZero_h

typedef struct OneZero {
    FLOAT gain;                 /* Filter subclass */
    FLOAT inputs;
    FLOAT lastOutput;           /* End of Filter */
    FLOAT zeroCoeff;
    FLOAT sgain;
} OneZero;

void make_OneZero(OneZero*);
void dest_OneZero(OneZero*);
void OneZero_clear(OneZero*);
void OneZero_setGain(OneZero*, FLOAT);
void OneZero_setCoeff(OneZero*, FLOAT);
FLOAT OneZero_tick(OneZero*, FLOAT);
void OneZero_print(OneZero *);


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