kopia lustrzana https://github.com/f4exb/sdrangel
57 wiersze
2.1 KiB
C++
57 wiersze
2.1 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2016 F4EXB //
|
|
// written by Edouard Griffiths //
|
|
// //
|
|
// 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 as version 3 of the License, or //
|
|
// //
|
|
// 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 V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include "filtermbe.h"
|
|
|
|
const float MBEAudioInterpolatorFilter::m_a0 = 3.869430E-02;
|
|
const float MBEAudioInterpolatorFilter::m_a1 = 7.738860E-02;
|
|
const float MBEAudioInterpolatorFilter::m_a2 = 3.869430E-02;
|
|
const float MBEAudioInterpolatorFilter::m_b1 = 1.392667E+00;
|
|
const float MBEAudioInterpolatorFilter::m_b2 = -5.474446E-01;
|
|
|
|
MBEAudioInterpolatorFilter::MBEAudioInterpolatorFilter()
|
|
{
|
|
init();
|
|
}
|
|
|
|
MBEAudioInterpolatorFilter::~MBEAudioInterpolatorFilter()
|
|
{}
|
|
|
|
void MBEAudioInterpolatorFilter::init()
|
|
{
|
|
m_x[0] = 0.0f;
|
|
m_x[1] = 0.0f;
|
|
m_y[0] = 0.0f;
|
|
m_y[1] = 0.0f;
|
|
}
|
|
|
|
float MBEAudioInterpolatorFilter::run(float sample)
|
|
{
|
|
float y = m_a0*sample + m_a1*m_x[0] + m_a2*m_x[1] + m_b1*m_y[0] + m_b2*m_y[1]; // this is y[n]
|
|
|
|
m_x[1] = m_x[0];
|
|
m_x[0] = sample;
|
|
|
|
m_y[1] = m_y[0];
|
|
m_y[0] = y;
|
|
|
|
return y;
|
|
}
|
|
|
|
|
|
|