/usr/include/SndObj/HiPass.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)Rory Walsh May 2003
// See License.txt for a disclaimer of all warranties
// and licensing information
//*************************************************************//
// HiPass.h : 1st order high pass filter //
// //
// Rory Walsh May 2003 //
// //
//*************************************************************//
#ifndef _HIPASS_H
#define _HIPASS_H
#include "LowPass.h"
class HiPass : public LoPass
{
protected:
public:
HiPass();
HiPass(float freq, SndObj* inObj, int vecsize=DEF_VECSIZE, float sr=DEF_SR);
~HiPass();
void SetFreq(float fr){
m_fr = fr;
double C = 2 - cos(2*PI*m_fr/m_sr);
m_b1 = C - sqrt((C*C) - 1);
m_a = 1 - m_b1;
}
void SetSr(float sr){
m_sr = sr;
double C = 2 - cos(2*PI*m_fr/m_sr);
m_b1 = C - sqrt((C*C) - 1);
m_a = 1 - m_b1;
}
int Set(char* mess, float value);
};
#endif
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