kopia lustrzana https://github.com/Hamlib/Hamlib
154 wiersze
4.3 KiB
C++
154 wiersze
4.3 KiB
C++
/*
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* Hamlib GNUradio backend - Demodulator chain class
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* Copyright (c) 2003 by Stephane Fillod
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*
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* $Id: demod.h,v 1.1 2003-10-20 22:34:56 fillods Exp $
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#ifndef _DEMOD_H
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#define _DEMOD_H 1
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#include <VrSigProc.h>
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#include <GrFreqXlatingFIRfilterCCF.h>
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#include <GrFIRfilterFFF.h>
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#include <VrAmp.h>
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#include <GrAGC.h>
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//#include <HrAGC.h>
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#include <gr_firdes.h>
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#include <gr_fir_builderF.h>
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#include "hamlib/rig.h"
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#include "misc.h"
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#define d_iType VrComplex
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#define d_oType float
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class DemodChainCF {
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public:
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DemodChainCF (VrSource<d_iType> *d_source, VrSink<d_oType> *d_sink, rmode_t mode, pbwidth_t width, int input_rate, freq_t centerfreq = 0) :
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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(500), CFIRdecimate(1), RFIRdecimate(1) {}
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virtual ~DemodChainCF () { delete agc; delete mixer; delete gainstage; delete audio_filter; }
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virtual const char *name() { return strrmode(mode); }
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virtual void connect (void);
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void setWidth (pbwidth_t width);
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void setFreq (freq_t centerfreq);
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rmode_t mode;
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pbwidth_t width;
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protected:
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VrSource<d_iType> *d_source;
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VrSink<d_oType> *d_sink;
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VrSigProc *demod_in;
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VrSigProc *demod_out;
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GrAGC<d_oType,d_oType> *agc;
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GrFreqXlatingFIRfilterCCF *mixer;
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VrAmp<d_oType,d_oType> *gainstage;
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GrFIRfilterFFF *audio_filter;
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int input_rate;
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freq_t centerfreq;
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float rf_gain;
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double if_width_of_transition_band;
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int CFIRdecimate;
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int RFIRdecimate;
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};
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void DemodChainCF::connect()
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{
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// change_filt();
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vector<float> channel_coeffs =
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gr_firdes::low_pass (rf_gain, // gain
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input_rate, // sampling rate
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width/2, // low-pass cutoff freq
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if_width_of_transition_band, // width of transition band
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gr_firdes::WIN_HAMMING);
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rig_debug(RIG_DEBUG_VERBOSE, "Number of channel_coeffs: %d\n", channel_coeffs.size ());
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vector<float> audio_coeffs =
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gr_firdes::band_pass (1, // gain
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input_rate, // sampling rate
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300,
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width,
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250, // width of transition band
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gr_firdes::WIN_HAMMING);
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rig_debug(RIG_DEBUG_VERBOSE, "Number of audio_coeffs: %d\n", audio_coeffs.size ());
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mixer = new GrFreqXlatingFIRfilterCCF (CFIRdecimate, channel_coeffs, centerfreq);
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agc = new GrAGC<d_oType,d_oType>(1e-2);
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gainstage = new VrAmp<float,float>(1); /* AF */
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audio_filter = new GrFIRfilterFFF (RFIRdecimate, audio_coeffs);
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NWO_CONNECT (d_source, mixer);
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NWO_CONNECT (mixer, demod_in);
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NWO_CONNECT (demod_out, agc);
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NWO_CONNECT (agc, gainstage);
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NWO_CONNECT (gainstage, audio_filter);
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NWO_CONNECT (audio_filter, d_sink);
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}
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void DemodChainCF::setFreq (freq_t centerfreq)
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{
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rig_debug(RIG_DEBUG_TRACE,"%s: %lld\n",__FUNCTION__, centerfreq);
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mixer->setCenterFreq(centerfreq);
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}
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void DemodChainCF::setWidth (pbwidth_t width)
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{
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// change_filt();
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vector<float> channel_coeffs =
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gr_firdes::low_pass (1.0, // gain
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input_rate, // sampling rate
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width/2, // low-pass cutoff freq
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if_width_of_transition_band, // width of transition band
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gr_firdes::WIN_HAMMING);
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rig_debug(RIG_DEBUG_VERBOSE, "%s: Number of channel_coeffs: %d\n", __FUNCTION__, channel_coeffs.size ());
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vector<float> audio_coeffs =
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gr_firdes::band_pass (1, // gain
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input_rate, // sampling rate
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300,
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width,
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250, // width of transition band
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gr_firdes::WIN_HAMMING);
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rig_debug(RIG_DEBUG_VERBOSE, "Number of audio_coeffs: %d\n", audio_coeffs.size ());
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mixer->setTaps(channel_coeffs);
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audio_filter->setTaps(audio_coeffs);
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}
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#endif /* _DEMOD_H */
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