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FormantFilter.h

/*
  ZynAddSubFX - a software synthesizer
 
  FormantFilter.h - formant filter
  Copyright (C) 2002-2005 Nasca Octavian Paul
  Author: Nasca Octavian Paul

  Modified for rakarrack by Josep Andreu


  This program is free software; you can redistribute it and/or modify
  it under the terms of version 2 of the GNU General Public License 
  as published by the Free Software Foundation.

  This program 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 General Public License (version 2) for more details.

  You should have received a copy of the GNU General Public License (version 2)
  along with this program; if not, write to the Free Software Foundation,
  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

*/

#ifndef FORMANT_FILTER_H
#define FORMANT_FILTER_H

#include "global.h"
#include "Filter_.h"
#include "AnalogFilter.h"
#include "FilterParams.h"

#define FF_MAX_VOWELS 6
#define FF_MAX_FORMANTS 12
#define FF_MAX_SEQUENCE 8
#define MAX_FILTER_STAGES 5



class FormantFilter:public Filter_
{
public:
  FormantFilter (class FilterParams * pars);
  ~FormantFilter ();
  void filterout (REALTYPE * smp);
  void setfreq (REALTYPE frequency);
  void setfreq_and_q (REALTYPE frequency, REALTYPE q_);
  void setq (REALTYPE q_);

  void cleanup ();
private:
    AnalogFilter * formant[FF_MAX_FORMANTS];
  REALTYPE *inbuffer, *tmpbuf;

  struct
  {
    REALTYPE freq, amp, q;    //frequency,amplitude,Q
  } formantpar[FF_MAX_VOWELS][FF_MAX_FORMANTS],
    currentformants[FF_MAX_FORMANTS];

  struct
  {
    unsigned char nvowel;
  } sequence[FF_MAX_SEQUENCE];

  REALTYPE oldformantamp[FF_MAX_FORMANTS];

  int sequencesize, numformants, firsttime;
  REALTYPE oldinput, slowinput;
  REALTYPE Qfactor, formantslowness, oldQfactor;
  REALTYPE vowelclearness, sequencestretch;

  void setpos (REALTYPE input);



};


#endif

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