/usr/include/SndObj/LowPass.h is in libsndobj-dev 2.6.6.1-3.
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
//************************************************************//
// LowPass.h: 1st order lowpass filter
// //
// //
//************************************************************//
#ifndef _LOWPASS_H
#define _LOWPASS_H
#include "Filter.h"
class LoPass : public Filter
{
protected:
public:
LoPass();
LoPass(float freq, SndObj* inObj, int vecsize=DEF_VECSIZE, float sr=DEF_SR);
~LoPass();
void SetFreq(float fr){
m_fr = fr;
double C = 2 - cos(2*PI*m_fr/m_sr);
m_b1 = sqrt((C*C) - 1) - C;
m_a = 1 + m_b1;
}
void SetSr(float sr){
m_sr = sr;
double C = 2 - cos(2*PI*m_fr/m_sr);
m_b1 = sqrt((C*C) - 1) - C;
m_a = 1 + m_b1;
}
int Set(char* mess, float value);
short DoProcess();
};
#endif
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