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analog: adding complex squelch base class.

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1 parent 970bb33 commit fce7c0c5e1b1648c03f453cff457116990268a7c @trondeau trondeau committed Oct 21, 2012
@@ -0,0 +1,56 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2006,2012 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio 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 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_ANALOG_SQUELCH_BASE_CC_H
+#define INCLUDED_ANALOG_SQUELCH_BASE_CC_H
+
+#include <analog/api.h>
+#include <gr_block.h>
+
+namespace gr {
+ namespace analog {
+
+ /*!
+ * \brief basic squelch block; to be subclassed for other squelches.
+ * \ingroup level_blk
+ */
+ class ANALOG_API squelch_base_cc : virtual public gr_block
+ {
+ protected:
+ virtual void update_state(const float &sample) = 0;
+ virtual bool mute() const = 0;
+
+ public:
+ squelch_base_cc() {};
+ virtual int ramp() const = 0;
+ virtual void set_ramp(int ramp) = 0;
+ virtual bool gate() const = 0;
+ virtual void set_gate(bool gate) = 0;
+ virtual bool unmuted() const = 0;
+
+ virtual std::vector<float> squelch_range() const = 0;
+ };
+
+ } /* namespace analog */
+} /* namespace gr */
+
+#endif /* INCLUDED_ANALOG_SQUELCH_BASE_CC_H */
@@ -0,0 +1,140 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2006,2012 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio 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 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "squelch_base_cc_impl.h"
+#include <gr_io_signature.h>
+
+namespace gr {
+ namespace analog {
+
+ squelch_base_cc_impl::squelch_base_cc_impl(const char *name, int ramp, bool gate)
+ : gr_block(name,
+ gr_make_io_signature(1, 1, sizeof(float)),
+ gr_make_io_signature(1, 1, sizeof(float)))
+ {
+ set_ramp(ramp);
+ set_gate(gate);
+ d_state = ST_MUTED;
+ d_envelope = d_ramp ? 0.0 : 1.0;
+ d_ramped = 0;
+ }
+
+ squelch_base_cc_impl::~squelch_base_cc_impl()
+ {
+ }
+
+ int
+ squelch_base_cc_impl::ramp() const
+ {
+ return d_ramp;
+ }
+
+ void
+ squelch_base_cc_impl::set_ramp(int ramp)
+ {
+ d_ramp = ramp;
+ }
+
+ bool
+ squelch_base_cc_impl::gate() const
+ {
+ return d_gate;
+ }
+
+ void
+ squelch_base_cc_impl::set_gate(bool gate)
+ {
+ d_gate = gate;
+ }
+
+ bool
+ squelch_base_cc_impl::unmuted() const
+ {
+ return (d_state == ST_UNMUTED || d_state == ST_ATTACK);
+ }
+
+ int
+ squelch_base_cc_impl::general_work(int noutput_items,
+ gr_vector_int &ninput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items)
+ {
+ const gr_complex *in = (const gr_complex *) input_items[0];
+ gr_complex *out = (gr_complex *) output_items[0];
+
+ int j = 0;
+
+ for(int i = 0; i < noutput_items; i++) {
+ update_state(in[i]);
+
+ // Adjust envelope based on current state
+ switch(d_state) {
+ case ST_MUTED:
+ if(!mute()) {
+ d_state = d_ramp ? ST_ATTACK : ST_UNMUTED; // If not ramping, go straight to unmuted
+ }
+ break;
+
+ case ST_UNMUTED:
+ if(mute()) {
+ d_state = d_ramp ? ST_DECAY : ST_MUTED; // If not ramping, go straight to muted
+ }
+ break;
+
+ case ST_ATTACK:
+ d_envelope = 0.5-std::cos(M_PI*(++d_ramped)/d_ramp)/2.0; // FIXME: precalculate window for speed
+ if(d_ramped >= d_ramp) { // use >= in case d_ramp is set to lower value elsewhere
+ d_state = ST_UNMUTED;
+ d_envelope = 1.0;
+ }
+ break;
+
+ case ST_DECAY:
+ d_envelope = 0.5-std::cos(M_PI*(--d_ramped)/d_ramp)/2.0; // FIXME: precalculate window for speed
+ if(d_ramped == 0.0) {
+ d_state = ST_MUTED;
+ }
+ break;
+ };
+
+ // If unmuted, copy input times envelope to output
+ // Otherwise, if not gating, copy zero to output
+ if(d_state != ST_MUTED) {
+ out[j++] = in[i]*gr_complex(d_envelope, 0.0);
+ }
+ else {
+ if(!d_gate) {
+ out[j++] = 0.0;
+ }
+ }
+ }
+
+ consume_each(noutput_items); // Use all the inputs
+ return j; // But only report outputs copied
+ }
+
+ } /* namespace analog */
+} /* namespace gr */
@@ -0,0 +1,65 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2006,2012 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio 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 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_GR_SQUELCH_BASE_CC_IMPL_H
+#define INCLUDED_GR_SQUELCH_BASE_CC_IMPL_H
+
+#include <analog/squelch_base_cc.h>
+
+namespace gr {
+ namespace analog {
+
+ class squelch_base_cc_impl : public squelch_base_cc
+ {
+ private:
+ int d_ramp;
+ int d_ramped;
+ bool d_gate;
+ double d_envelope;
+ enum { ST_MUTED, ST_ATTACK, ST_UNMUTED, ST_DECAY } d_state;
+
+ protected:
+ virtual void update_state(const gr_complex &sample) {};
+ virtual bool mute() const { return false; };
+
+ public:
+ squelch_base_cc_impl(const char *name, int ramp, bool gate);
+ ~squelch_base_cc_impl();
+
+ int ramp() const;
+ void set_ramp(int ramp);
+ bool gate() const;
+ void set_gate(bool gate);
+ bool unmuted() const;
+
+ virtual std::vector<float> squelch_range() const = 0;
+
+ int general_work(int noutput_items,
+ gr_vector_int &ninput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items);
+ };
+
+ } /* namespace analog */
+} /* namespace gr */
+
+#endif /* INCLUDED_ANALOG_SQUELCH_BASE_IMPL_FF_H */

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