mirror of https://github.com/g4klx/MMDVM.git
47 lines
1.7 KiB
C++
47 lines
1.7 KiB
C++
/*
|
|
* Copyright (C) 2020 by Jonathan Naylor G4KLX / Geoffrey Merck F4FXL - KC3FRA
|
|
*
|
|
* This program 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 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include "CTCSSDecoder.h"
|
|
|
|
CCTCSSDEcoder::CCTCSSDEcoder(const TCTCSSTone& tone, q15_t threshold) :
|
|
m_thresholdSquared(threshold * threshold),
|
|
m_hasCTCSS(false)
|
|
{
|
|
m_goertzel = new CGoertzel(tone.toneLow, tone.tone, tone.toneHi, HANN_WINDOW, HANN_WINDOW_CORR, N_SAMPLES);
|
|
}
|
|
|
|
|
|
void CCTCSSDEcoder::samples(const q15_t* samples, uint8_t length)
|
|
{
|
|
unsigned int f1MagSquared, f2MagSquared, f3MagSquared;
|
|
GOERTZEL_RESULT result = m_goertzel->samples(samples, length, &f1MagSquared, &f2MagSquared, &f3MagSquared);
|
|
|
|
if(result == GR_READY) {
|
|
// Goertzel says it has something for us, so checkt it
|
|
// make sure the strongest tone is the wanted one and not the neighbouring tone
|
|
m_hasCTCSS = f2MagSquared >= m_thresholdSquared
|
|
&& f2MagSquared > f1MagSquared
|
|
&& f2MagSquared > f3MagSquared;
|
|
}
|
|
}
|
|
|
|
bool CCTCSSDEcoder::hasCTCSS()
|
|
{
|
|
return m_hasCTCSS;
|
|
}
|