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/*
fm4op.h:
Copyright (C) 1998 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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*******************************************/
/* Master Class for 4 Operator FM Synth */
/* by Perry R. Cook, 1995-96 */
/* This instrument contains an 4 waves, */
/* 4 envelopes, and various state vars. */
/* */
/* The basic Chowning/Stanford FM patent */
/* expired April 1995, but there exist */
/* follow-on patents, mostly assigned to */
/* Yamaha. If you are of the type who */
/* should worry about this (making money) */
/* worry away. */
/* */
/*******************************************/
#if !defined(__FM4OP_h)
#define __FM4OP_h
#include "physutil.h"
/*******************************************/
/* Two Zero Filter Class, */
/* by Perry R. Cook, 1995-96 */
/* See books on filters to understand */
/* more about how this works. Nothing */
/* out of the ordinary in this version. */
/*******************************************/
typedef struct TwoZero {
MYFLT gain;
MYFLT lastOutput;
MYFLT inputs[2];
MYFLT zeroCoeffs[2];
} TwoZero;
/* ********************************************************************** */
typedef struct FM4OP {
OPDS h;
MYFLT *ar; /* Output */
MYFLT *amp, *frequency;
MYFLT *control1, *control2, *modDepth; /* Control1 doubles as vowel */
MYFLT *vibFreq;
MYFLT *ifn0, *ifn1, *ifn2, *ifn3, *vifn;
MYFLT *opt;
ADSR adsr[4];
FUNC *waves[4];
MYFLT w_rate[4]; /* Parameters for vibrato */
MYFLT w_time[4];
MYFLT w_phase[4];
FUNC *vibWave;
MYFLT v_rate; /* Parameters for vibrato */
MYFLT v_time;
/* MYFLT v_phaseOffset; */
TwoZero twozero;
MYFLT baseFreq;
MYFLT ratios[4];
MYFLT gains[4];
} FM4OP;
typedef struct FM4OPV {
OPDS h;
MYFLT *ar; /* Output */
MYFLT *amp, *frequency;
MYFLT *control1, *control2, *modDepth; /* Control1 doubles as vowel */
MYFLT *vibFreq;
MYFLT *ifn0, *ifn1, *ifn2, *ifn3, *vifn;
ADSR adsr[4];
FUNC *waves[4];
MYFLT w_rate[4];
MYFLT w_time[4];
MYFLT w_phase[4];
FUNC *vibWave;
MYFLT v_rate; /* Parameters for vibrato */
MYFLT v_time; /* Parameters for vibrato */
/* MYFLT v_phaseOffset; */
TwoZero twozero;
MYFLT baseFreq;
MYFLT ratios[4];
MYFLT gains[4];
MYFLT tilt[3];
MYFLT mods[3];
MYFLT last_control;
} FM4OPV;
#endif
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