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https://github.com/gqrx-sdr/gqrx.git
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110 lines
4.0 KiB
C++
110 lines
4.0 KiB
C++
/* -*- c++ -*- */
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/*
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* Copyright 2011 Alexandru Csete OZ9AEC.
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*
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* Gqrx is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* Gqrx 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Gqrx; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef RX_AGC_XX_H
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#define RX_AGC_XX_H
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#include <gr_sync_block.h>
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#include <gr_complex.h>
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#include <boost/thread/mutex.hpp>
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#include <dsp/agc_impl.h>
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class rx_agc_cc;
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typedef boost::shared_ptr<rx_agc_cc> rx_agc_cc_sptr;
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/*! \brief Return a shared_ptr to a new instance of rx_agc_cc.
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* \param sample_rate The samle rate (default = 96000).
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* \param agc_on Whether AGC should be ON (default = true).
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* \param threshold AGC Knee in dB if AGC is active. Range -160 to 0dB
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* (default = -100dB).
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* \param manual_gain Manual gain when AGC is OFF. Range 0 to 100dB
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* (default = 0dB).
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* \param slope AGC slope factor. Specifies dB reduction in output at
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* knee from maximum output level. Range 0 to 10dB
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* (default = 2dB TBC).
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* \param decay AGC decay time in milliseconds. Range 20 to 5000. This
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* parameter determines whether AGC is fast/slow/medium.
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* The default value is 100ms (fast AGC).
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* \param use_hang Whether AGC should "hang" before starting to decay.
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* The default is false.
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*
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* This is effectively the public constructor for a new AGC block.
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* To avoid accidental use of raw pointers, the rx_agc_cc constructor is private.
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* make_rx_agc_cc is the public interface for creating new instances.
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*/
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rx_agc_cc_sptr make_rx_agc_cc(double sample_rate = 96000.0, bool agc_on = true,
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int threshold = -100, int manual_gain = 0,
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int slope = 2, int decay = 100,
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bool use_hang = false);
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/*! \brief Experimental AGC block for analog voice modes (AM, SSB, CW).
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* \ingroup DSP
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*
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* This block performs automatic gain control.
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* To be written...
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*
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* \todo rx_agc_ff
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*/
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class rx_agc_cc : public gr_sync_block
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{
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friend rx_agc_cc_sptr make_rx_agc_cc(double sample_rate, bool agc_on,
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int threshold, int manual_gain,
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int slope, int decay, bool use_hang);
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protected:
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rx_agc_cc(double sample_rate, bool agc_on, int threshold, int manual_gain,
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int slope, int decay, bool use_hang);
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public:
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~rx_agc_cc();
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int work(int noutput_items,
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gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items);
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void set_agc_on(bool agc_on);
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void set_sample_rate(double sample_rate);
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void set_threshold(int threshold);
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void set_manual_gain(int gain);
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void set_slope(int slope);
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void set_decay(int decay);
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void set_use_hang(bool use_hang);
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private:
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CAgc *d_agc;
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boost::mutex d_mutex; /*! Used to lock internal data while processing or setting parameters. */
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bool d_agc_on; /*! Current AGC status (true/false). */
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double d_sample_rate; /*! Current sample rate. */
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int d_threshold; /*! Current AGC threshold (-160...0 dB). */
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int d_manual_gain; /*! Current gain when AGC is OFF. */
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int d_slope; /*! Current AGC slope (0...10 dB). */
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int d_decay; /*! Current AGC decay (20...5000 ms). */
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bool d_use_hang; /*! Current AGC hang status (true/false). */
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TYPECPX ib[64000];
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TYPECPX ob[64000];
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};
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#endif /* RX_AGC_XX_H */
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