/usr/include/SndObj/Hilb.h is in libsndobj-dev 2.6.6.1-3.
This file is owned by root:root, with mode 0o644.
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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
/////////////////////////////////////////////////////
// Hilbert Transform filter
//
// VL, 2001
//////////////////////////////////////////////////////
#ifndef _HILB_H
#define _HILB_H
#include "SndObj.h"
const float c1 = -0.190696f;
const float c2 = -0.860735f;
const float c3 = -0.5531f;
const double poles[12] = {.3609, 2.7412, 11.1573, 44.7581, 179.6242, 798.4578,
1.2524, 5.5671, 22.3423, 89.6271, 364.7914, 2770.1114};
class Hilb : public SndObj
{
protected:
SndObj* m_channel;
// pointers to the memory locations
double* m_delay1;
double* m_delay2;
double* m_delay3;
double* m_delay4;
// memory
double* m_delay;
double* m_coef;
inline double allpass(double in, double* delay, double coef);
public:
SndObj* real;
SndObj* imag;
// constructors / destructor
Hilb();
Hilb(SndObj* input,
int vecsize=DEF_VECSIZE, float sr=DEF_SR);
~Hilb();
short DoProcess();
char* ErrorMessage();
};
double
Hilb::allpass(double in, double* delay, double coef1){
double out = coef1*(in - delay[1]) + delay[0];
// recirculate the delay line
delay[0] = in;
return (delay[1] = out);
}
#endif
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