initial revision

git-svn-id: https://hamlib.svn.sourceforge.net/svnroot/hamlib/trunk@1570 7ae35d74-ebe9-4afe-98af-79ac388436b8

gnuradio/demod.h

@@ -0,0 +1,153 @@
+/*
+ *  Hamlib GNUradio backend - Demodulator chain class
+ *  Copyright (c) 2003 by Stephane Fillod
+ *
+ *	$Id: demod.h,v 1.1 2003-10-20 22:34:56 fillods Exp $
+ *
+ *   This library is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU Library 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 Library General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Library General Public
+ *   License along with this library; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, 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(500), CFIRdecimate(1), RFIRdecimate(1) {}
+	virtual ~DemodChainCF () { delete agc; delete mixer; delete gainstage; delete audio_filter; }
+
+	virtual const char *name() { return 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;
+
+	GrAGC<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 GrAGC<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 */