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43 lines
1.2 KiB
43 lines
1.2 KiB
/*
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* Copyright (C) 2009,2013 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; version 2 of the License.
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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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#ifndef DStarGMSKModulator_H
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#define DStarGMSKModulator_H
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#include "FIRFilter.h"
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/*
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* GMSK modulator for D-Star 4800 bps transmissions.
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*
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* Converts a single NRZ bit into a sequence of float audio samples using a
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* Gaussian FIR pulse-shaping filter (BT=0.5). The output sample buffer must
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* be pre-allocated by the caller; code() returns the number of samples written.
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* setInvert() reverses the polarity of the modulated signal for hardware that
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* requires the opposite sense.
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*/
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class CDStarGMSKModulator {
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public:
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CDStarGMSKModulator();
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~CDStarGMSKModulator();
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unsigned int code(bool bit, float* buffer, unsigned int length);
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void setInvert(bool set);
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private:
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CFIRFilter m_filter;
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bool m_invert;
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};
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#endif
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