kopia lustrzana https://github.com/Hamlib/Hamlib
153 wiersze
4.3 KiB
C++
153 wiersze
4.3 KiB
C++
/*
|
|
* Hamlib GNUradio backend - Demodulator chain class
|
|
* Copyright (c) 2003-2004 by Stephane Fillod
|
|
*
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*/
|
|
|
|
#ifndef _DEMOD_H
|
|
#define _DEMOD_H 1
|
|
|
|
|
|
#include <VrSigProc.h>
|
|
#include <GrFreqXlatingFIRfilterCCF.h>
|
|
#include <GrFIRfilterFFF.h>
|
|
#include <VrAmp.h>
|
|
|
|
//#include <GrAGC.h>
|
|
#include <HrAGC.h>
|
|
|
|
#include <gr_firdes.h>
|
|
#include <gr_fir_builderF.h>
|
|
|
|
#include "hamlib/rig.h"
|
|
#include "misc.h"
|
|
|
|
|
|
#define d_iType VrComplex
|
|
#define d_oType float
|
|
|
|
class DemodChainCF {
|
|
public:
|
|
DemodChainCF (VrSource<d_iType> *d_source, VrSink<d_oType> *d_sink, rmode_t mode, pbwidth_t width, int input_rate, freq_t centerfreq = 0) :
|
|
d_source(d_source), d_sink(d_sink), mode(mode), width(width), input_rate(input_rate), centerfreq(centerfreq), rf_gain(1.0), if_width_of_transition_band(1000), CFIRdecimate(1), RFIRdecimate(1) {}
|
|
virtual ~DemodChainCF () { delete agc; delete mixer; delete gainstage; delete audio_filter; }
|
|
|
|
virtual const char *name() { return rig_strrmode(mode); }
|
|
|
|
virtual void connect (void);
|
|
void setWidth (pbwidth_t width);
|
|
void setFreq (freq_t centerfreq);
|
|
|
|
rmode_t mode;
|
|
pbwidth_t width;
|
|
|
|
protected:
|
|
VrSource<d_iType> *d_source;
|
|
VrSink<d_oType> *d_sink;
|
|
|
|
VrSigProc *demod_in;
|
|
VrSigProc *demod_out;
|
|
|
|
HrAGC<d_oType,d_oType> *agc;
|
|
GrFreqXlatingFIRfilterCCF *mixer;
|
|
VrAmp<d_oType,d_oType> *gainstage;
|
|
GrFIRfilterFFF *audio_filter;
|
|
|
|
int input_rate;
|
|
freq_t centerfreq;
|
|
float rf_gain;
|
|
double if_width_of_transition_band;
|
|
int CFIRdecimate;
|
|
int RFIRdecimate;
|
|
|
|
};
|
|
|
|
|
|
void DemodChainCF::connect()
|
|
{
|
|
// change_filt();
|
|
vector<float> channel_coeffs =
|
|
gr_firdes::low_pass (rf_gain, // gain
|
|
input_rate, // sampling rate
|
|
width/2, // low-pass cutoff freq
|
|
if_width_of_transition_band, // width of transition band
|
|
gr_firdes::WIN_HAMMING);
|
|
|
|
rig_debug(RIG_DEBUG_VERBOSE, "Number of channel_coeffs: %d\n", channel_coeffs.size ());
|
|
|
|
vector<float> audio_coeffs =
|
|
gr_firdes::band_pass (1, // gain
|
|
input_rate, // sampling rate
|
|
300,
|
|
width,
|
|
250, // width of transition band
|
|
gr_firdes::WIN_HAMMING);
|
|
|
|
rig_debug(RIG_DEBUG_VERBOSE, "Number of audio_coeffs: %d\n", audio_coeffs.size ());
|
|
|
|
|
|
mixer = new GrFreqXlatingFIRfilterCCF (CFIRdecimate, channel_coeffs, centerfreq);
|
|
agc = new HrAGC<d_oType,d_oType>(1e-2);
|
|
gainstage = new VrAmp<float,float>(1); /* AF */
|
|
audio_filter = new GrFIRfilterFFF (RFIRdecimate, audio_coeffs);
|
|
|
|
NWO_CONNECT (d_source, mixer);
|
|
NWO_CONNECT (mixer, demod_in);
|
|
NWO_CONNECT (demod_out, agc);
|
|
NWO_CONNECT (agc, gainstage);
|
|
NWO_CONNECT (gainstage, audio_filter);
|
|
NWO_CONNECT (audio_filter, d_sink);
|
|
|
|
}
|
|
|
|
void DemodChainCF::setFreq (freq_t centerfreq)
|
|
{
|
|
rig_debug(RIG_DEBUG_TRACE,"%s: %lld\n",__FUNCTION__, centerfreq);
|
|
mixer->setCenterFreq(centerfreq);
|
|
}
|
|
|
|
void DemodChainCF::setWidth (pbwidth_t width)
|
|
{
|
|
// change_filt();
|
|
vector<float> channel_coeffs =
|
|
gr_firdes::low_pass (1.0, // gain
|
|
input_rate, // sampling rate
|
|
width/2, // low-pass cutoff freq
|
|
if_width_of_transition_band, // width of transition band
|
|
gr_firdes::WIN_HAMMING);
|
|
|
|
rig_debug(RIG_DEBUG_VERBOSE, "%s: Number of channel_coeffs: %d\n", __FUNCTION__, channel_coeffs.size ());
|
|
|
|
vector<float> audio_coeffs =
|
|
gr_firdes::band_pass (1, // gain
|
|
input_rate, // sampling rate
|
|
300,
|
|
width,
|
|
250, // width of transition band
|
|
gr_firdes::WIN_HAMMING);
|
|
|
|
rig_debug(RIG_DEBUG_VERBOSE, "Number of audio_coeffs: %d\n", audio_coeffs.size ());
|
|
|
|
|
|
mixer->setTaps(channel_coeffs);
|
|
audio_filter->setTaps(audio_coeffs);
|
|
}
|
|
|
|
|
|
#endif /* _DEMOD_H */
|