mirror of https://github.com/g4klx/MMDVM.git
53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
/*
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* Copyright (C) 2020 by Jonathan Naylor G4KLX
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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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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*
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#if !defined(FMNOISESQUELCH_H)
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#define FMNOISESQUELCH_H
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#include "Config.h"
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const uint8_t NS_NONE = 0U;
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const uint8_t NS_READY = 1U;
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const uint8_t NS_VALID = 2U;
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#define NSQ_READY(a) ((a & NS_READY) != 0)
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#define NSQ_NOT_READY(a) ((a & NS_READY) == 0)
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#define NSQ_VALID(a) ((a & NS_VALID) != 0)
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#define NSQ_NOT_VALID(a) ((a & NS_VALID) == 0)
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class CFMNoiseSquelch {
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public:
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CFMNoiseSquelch();
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void setParams(uint8_t highThreshold, uint8_t lowThreshold);
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uint8_t process(q15_t sample);
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void reset();
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private:
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q31_t m_highThreshold;
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q31_t m_lowThreshold;
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uint16_t m_count;
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q31_t m_q0;
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q31_t m_q1;
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uint8_t m_result;
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};
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#endif
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