portapack-mayhem/firmware/baseband/proc_nfm_audio.hpp

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* 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, 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; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_NFM_AUDIO_H__
#define __PROC_NFM_AUDIO_H__
#include "baseband_processor.hpp"
#include "channel_decimator.hpp"
#include "dsp_decimate.hpp"
#include "dsp_demodulate.hpp"
#include "dsp_fir_taps.hpp"
#include "dsp_iir.hpp"
#include "dsp_iir_config.hpp"
#include "dsp_squelch.hpp"
class NarrowbandFMAudio : public BasebandProcessor {
public:
NarrowbandFMAudio() {
decimator.set_decimation_factor(ChannelDecimator::DecimationFactor::By32);
channel_filter.configure(channel_filter_taps.taps, 2);
}
void execute(buffer_c8_t buffer) override;
private:
ChannelDecimator decimator;
const fir_taps_real<64>& channel_filter_taps = taps_64_lp_042_078_tfilter;
dsp::decimate::FIRAndDecimateComplex channel_filter;
dsp::demodulate::FM demod { 48000, 7500 };
IIRBiquadFilter audio_hpf { audio_hpf_config };
FMSquelch squelch;
};
#endif/*__PROC_NFM_AUDIO_H__*/