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// HamFax -- an application for sending and receiving amateur radio facsimiles
// Copyright (C) 2001 Christof Schmitt, DH1CS <cschmitt@users.sourceforge.net>
//
// 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.
#include "FaxModulator.hpp"
#include <math.h>
FaxModulator::FaxModulator(QObject* parent)
: QObject(parent), sampleRate(0), carrier(0), dev(0)
{
sine=new short[size_sine];
for(int i=0; i<size_sine; i++) {
sine[i]=static_cast<short>(32767*sin(2.0*M_PI*i/size_sine));
}
}
FaxModulator::~FaxModulator(void)
{
delete[] sine;
}
void FaxModulator::init(void)
{
phase=0;
}
void FaxModulator::modulate(double* buffer, int number)
{
short sample[number];
for(int i=0; i<number; i++) {
if(fm) {
sample[i]=sine[phase];
int f=static_cast<int>(carrier+2.*(buffer[i]-0.5)*dev);
phase+=size_sine*f/sampleRate;
} else {
sample[i]=static_cast<short>(buffer[i]*sine[phase]);
phase+=size_sine*carrier/sampleRate;
}
phase%=size_sine;
}
emit data(sample,number);
}
void FaxModulator::setSampleRate(int sr)
{
sampleRate=sr;
}
void FaxModulator::setCarrier(int carrier)
{
this->carrier=carrier;
}
void FaxModulator::setDeviation(int dev)
{
this->dev=dev;
}
void FaxModulator::setFM(bool fm)
{
this->fm=fm;
}
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