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Add Downsampling

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This commit is contained in:
Geoffrey Merck 2020-04-28 21:37:06 +02:00
parent dac0f26e5d
commit cf18f95a92
6 changed files with 283 additions and 3 deletions
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43
FMDownsampler.h Normal file
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/*
* Copyright (C) 2020 by Jonathan Naylor G4KLX
* Copyright (C) 2020 by 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.
*/
#if !defined(FMDOWNSAMPLER_H)
#define FMDOWNSAMPLER_H
#include "Config.h"
#include "FMDownsampleRB.h"
class CFMDownsampler {
public:
CFMDownsampler(uint16_t length);
void addSample(q15_t sample);
inline bool getPackedData(uint8_t& data){ return m_ringBuffer.get(data); };
inline bool hasOverflowed() { return m_ringBuffer.hasOverflowed(); };
private:
CFMDownsampleRB m_ringBuffer;
union {
int32_t m_samplePack;
int8_t m_samplePackBytes[4];
};
uint8_t m_packIndex;
uint8_t m_downSampleIndex;
};
#endif