/usr/include/SndObj/ButtBP.h is in libsndobj-dev 2.6.7+ds1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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////////////////////////////////////////////////////////////////////////
// This file is part of the SndObj library
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// 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 for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Copyright (c)Victor Lazzarini, 1997-2004
// See License.txt for a disclaimer of all warranties
// and licensing information
//************************************************************//
// ButtBP.h: interface of the ButtBP class (2nd order //
// butterworth band-pass filter). //
// //
// //
//************************************************************//
#ifndef _ButtBP_H
#define _ButtBP_H
#include "TpTz.h"
class ButtBP: public TpTz
{
protected:
void inline SetParam(float fr, float bw, int type);
int m_type;
SndObj* m_inputbw;
SndObj* m_inputfr;
public:
ButtBP();
ButtBP(float fr, float bw, SndObj* inObj, SndObj* inputfreq = 0,
SndObj* inputbw = 0, int vecsize=DEF_VECSIZE, float sr=DEF_SR);
~ButtBP();
int Set(char* mess, float value);
void SetFreq(float fr){ SetFreq(fr,m_inputfr);}
void SetBW(float bw){ SetBW(bw,m_inputbw);}
void SetFreq(float fr, SndObj* InFrObj);
void SetBW(float bw, SndObj* InBWObj);
void SetSr(float sr){
m_sr = sr;
SetParam(m_fr, m_bw, m_type);
}
int Connect(char* mess, void* input);
short DoProcess();
};
void ButtBP::SetParam(float fr, float bw, int type){
double C, D;
switch(type){
case 1: // BP
C = 1/(tan(PI*bw/m_sr));
D = 2*cos((2*PI*fr)/m_sr);
m_a = (1/(1+C));
m_a1 = 0.f;
m_a2 = -m_a;
m_b1 = -(C*D*m_a);
m_b2 = (C - 1)*m_a;
break;
case 2: // BR
C = (tan(PI*bw/m_sr));
D = 2*cos((2*PI*fr)/m_sr);
m_a = 1/(1+C);
m_a1 = -(D*m_a);
m_a2 = m_a;
m_b1 = -(D*m_a);
m_b2 = (1 - C)*m_a;
break;
case 3: // HP
C = tan(PI*fr/m_sr);
m_a = 1/(1 + sqrt(2.0)*C + (C*C)); // a2 = a0
m_a1 = - 2*m_a;
m_a2 = m_a;
m_b1 = 2*((C*C) - 1)*m_a;
m_b2 = (1 - sqrt(2.0)*C + (C*C))*m_a;
break;
case 4:
C = 1/(tan(PI*fr/m_sr));
m_a = 1/(1 + sqrt(2.0)*C + (C*C)); // a2 = a0
m_a1 = 2*m_a;
m_a2 = m_a;
m_b1 = 2*(1 - (C*C))*m_a;
m_b2 = (1 - sqrt(2.0)*C + (C*C))*m_a;
break;
}
}
#endif
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