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/*
* Copyright (C) 2002 by Phil Karn KA9Q
* Copyright (C) 2003 by Jonathan Naylor G4KLX
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "AudioMixer.h"
#include <wx/log.h>
#include <wx/debug.h>
#include <complex>
using namespace std;
CAudioMixer::CAudioMixer(int sampleRate) :
m_sampleRate(sampleRate),
m_nco(sampleRate),
m_hilbert(0.05, 0.45)
{
wxASSERT(m_sampleRate > 0);
}
CAudioMixer::~CAudioMixer()
{
}
void CAudioMixer::mix(double frequency, double* input, double* output, int length)
{
wxASSERT(input != NULL);
wxASSERT(output != NULL);
wxASSERT(length > 0);
complex<double>* osc = new complex<double>[length];
m_nco.generate(frequency, osc, length);
complex<double>* out = new complex<double>[length];
m_hilbert.transform(input, out, length);
for (int i = 0; i < length; i++) {
complex<double> mix = osc[i] * out[i];
if (frequency < 0.0)
output[i] = mix.imag();
else
output[i] = mix.real();
}
delete[] osc;
delete[] out;
}
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