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/*
brass.h:
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
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
*/
/******************************************/
/* Simple Brass Instrument Model ala */
/* Cook (TBone, HosePlayer) */
/* by Perry R. Cook, 1995-96 */
/* */
/* This is a waveguide model, and thus */
/* relates to various Stanford Univ. */
/* and possibly Yamaha and other patents.*/
/* */
/* Controls: CONTROL1 = lipTension */
/* CONTROL2 = slideLength */
/* CONTROL3 = vibFreq */
/* MOD_WHEEL= vibAmt */
/******************************************/
#if !defined(__brass_h)
#define __brass_h
#include "physutil.h"
#include <math.h>
/*******************************************/
/* */
/* AllPass Interpolating Delay Line */
/* Object by Perry R. Cook 1995-96 */
/* This one uses a delay line of maximum */
/* length specified on creation, and */
/* interpolates fractional length using */
/* an all-pass filter. This version is */
/* more efficient for computing static */
/* length delay lines (alpha and coeff */
/* are computed only when the length */
/* is set, there probably is a more */
/* efficient computational form if alpha */
/* is changed often (each sample)). */
/* */
/*******************************************/
typedef struct DLineA {
AUXCH inputs;
MYFLT lastOutput;
int32 inPoint;
int32 outPoint;
int32 length;
MYFLT alpha;
MYFLT coeff;
MYFLT lastIn;
} DLineA;
void make_DLineA(CSOUND *,DLineA *, int32 max_length);
/* void DLineA_clear(DLineA *); */
int32_t DLineA_setDelay(CSOUND *,DLineA *, MYFLT length);
MYFLT DLineA_tick(DLineA *, MYFLT sample);
/***********************************************/
/* Lip Filter Object by Perry R. Cook, 1995-96*/
/* The lip of the brass player has dynamics */
/* which are controlled by the mass, spring */
/* constant, and damping of the lip. This */
/* filter simulates that behavior and the */
/* transmission/reflection properties as */
/* well. See Cook TBone and HosePlayer */
/* instruments and articles. */
/***********************************************/
typedef BiQuad LipFilt;
void make_LipFilt(LipFilt*);
void LipFilt_clear(LipFilt*);
void LipFilt_setFreq(CSOUND*,LipFilt*, MYFLT frequency);
MYFLT LipFilt_tick(LipFilt*, MYFLT mouthSample,MYFLT boreSample);
MYFLT LipFilt_lastOut(LipFilt*);
/* ---------------------------------------------------------------------- */
typedef struct BRASS {
OPDS h;
MYFLT *ar; /* Output */
MYFLT *amp, *frequency;
MYFLT *liptension, *dettack;
MYFLT *vibFreq, *vibAmt, *ifn, *lowestFreq;
FUNC *vibr; /* Table for vibrato */
MYFLT v_rate; /* Parameters for vibrato */
MYFLT v_time;
/* MYFLT v_phaseOffset; */
DLineA delayLine;
LipFilt lipFilter;
DCBlock dcBlock;
ADSR adsr;
int32 length;
MYFLT slideTarget;
MYFLT maxPressure;
MYFLT lipTarget;
MYFLT frq; /* Remember previous value */
MYFLT lipT; /* and lip tension */
MYFLT limit;
int32_t kloop;
} BRASS;
#endif
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