kopia lustrzana https://github.com/jamescoxon/dl-fldigi
83 wiersze
2.1 KiB
C++
83 wiersze
2.1 KiB
C++
// ----------------------------------------------------------------------------
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// Copyright (C) 2014
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// David Freese, W1HKJ
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//
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// This file is part of fldigi
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//
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// fldigi 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 of the License, or
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// (at your option) any later version.
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//
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// fldigi 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 this program. If not, see <http://www.gnu.org/licenses/>.
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// ----------------------------------------------------------------------------
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#include <string>
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#include "filters.h"
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class cDTMF {
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private:
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//#define N 240 // 30 msec interval at 8000 sps
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#define RANGE 0.5 /* any thing higher than RANGE*peak is "on" */
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#define THRESH 1000 /* 6 dB s/n for detection */
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#define FLUSH_TIME 10 /* 10 frames ~ 330 millisecond */
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#define NUMTONES 8
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private:
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double power[NUMTONES];
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double thresh;
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double maxpower;
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double minpower;
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double data[350];
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goertzel *filt[NUMTONES];
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int framesize;
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static double coef[];
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static int k[];
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static const char *dtran[];
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static int row[];
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static int col[];
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static const char rc[];
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double outbuf[16384];
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double shape[128];
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int RT;
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int duration;
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int silence_time;
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int last;
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std::string dtmfchars;
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public:
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cDTMF() {
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for (int i = 0; i < 4; i++) filt[i] = new goertzel(240, row[i], 8000);
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for (int i = 0; i < 4; i++) filt[i+4] = new goertzel(240, col[i], 8000);
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for (int i = 0; i < 240; i++) data[i] = 0;
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dtmfchars.clear();
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framesize = 240; // 8000 sr default
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silence_time = 0;
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last = ' ';
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}
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~cDTMF() {};
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// receive
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void calc_power();
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int decode();
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void receive(const float* buf, size_t len);
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// transmit
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void makeshape();
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void silence(int);
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void two_tones(int);
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void send();
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};
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