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109 lines
4.0 KiB
C++
109 lines
4.0 KiB
C++
/* anb.h
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2013, 2014 Warren Pratt, NR0V
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Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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The author can be reached by email at
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warren@wpratt.com
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*/
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#ifndef wdsp_anb_h
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#define wdsp_anb_h
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#include <vector>
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#include "export.h"
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namespace WDSP {
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class WDSP_API ANB
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{
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public:
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int run;
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int buffsize; // size of input/output buffer
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float* in; // input buffer
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float* out; // output buffer
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int dline_size; // length of delay line which is 'double dline[length][2]'
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std::vector<float> dline; // delay line
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double samplerate; // samplerate, used to convert times into sample counts
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double tau; // transition time, signal<->zero
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double hangtime; // time to stay at zero after noise is no longer detected
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double advtime; // deadtime (zero output) in advance of detected noise
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double backtau; // time constant used in averaging the magnitude of the input signal
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double threshold; // triggers if (noise > threshold * average_signal_magnitude)
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std::vector<double> wave; // array holding transition waveform
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int state; // state of the state machine
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double avg; // average value of the signal magnitude
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int dtime; // count when decreasing the signal magnitude
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int htime; // count when hanging
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int itime; // count when increasing the signal magnitude
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int atime; // count at zero before the noise burst (advance count)
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double coef; // parameter in calculating transition waveform
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int trans_count; // number of samples to equal 'tau' time
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int hang_count; // number of samples to equal 'hangtime' time
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int adv_count; // number of samples to equal 'advtime' time
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int in_idx; // ring buffer position into which new samples are inserted
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int out_idx; // ring buffer position from which delayed samples are pulled
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double power; // level at which signal was increasing when a new decrease is started
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int count; // set each time a noise sample is detected, counts down
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double backmult; // multiplier for waveform averaging
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double ombackmult; // multiplier for waveform averaging
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ANB(
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int run,
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int buffsize,
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float* in,
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float* out,
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double samplerate,
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double tau,
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double hangtime,
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double advtime,
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double backtau,
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double threshold
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);
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ANB(const ANB&) = delete;
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ANB& operator=(const ANB& other) = delete;
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~ANB() = default;
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void flush();
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void execute();
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void setBuffers(float* in, float* out);
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void setSize(int size);
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// Common interface
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void setRun (int run);
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void setBuffsize (int size);
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void setSamplerate (int rate);
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void setTau (double tau);
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void setHangtime (double time);
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void setAdvtime (double time);
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void setBacktau (double tau);
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void setThreshold (double thresh);
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private:
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void initBlanker();
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};
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} // namespace
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#endif
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