/*
 * Copyright 2012 Free Software Foundation, Inc.
 * 
 * This file is part of GNU Radio
 * 
 * GNU Radio 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 3, or (at your option)
 * any later version.
 * 
 * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#include <gr_core_api.h>
#include <gr_top_block.h>

class gr_blks2_am_demod;
typedef boost::shared_ptr<gr_blks2_am_demod> gr_blks2_am_demod_sptr;

GR_CORE_API gr_blks2_am_demod_sptr gr_make_blks2_am_demod(int channel_rate=250000,
						int audio_decim=5,
						double audio_pass=5000,
						double audio_stop=5500);

/*!
 * \brief Generalized AM demodulation block with audio filtering.
 *
 * This block demodulates a band-limited, complex down-converted AM 
 * channel into the the original baseband signal, applying low pass 
 * filtering to the audio output. It produces a float stream in the
 * range [-1.0, +1.0].
 * \ingroup misc_blk
 */
class GR_CORE_API gr_blks2_am_demod : public gr_hier_block2
{
private:
	gr_blks2_am_demod(
		int channel_rate,   /* incoming sample rate of the AM baseband */
		int audio_decim,   /* input to output decimation rate */
		double audio_pass, /* audio low pass filter passband frequency */
		double audio_stop); /* audio low pass filter stop frequency */

	friend GR_CORE_API gr_blks2_am_demod_sptr gr_blks2_make_am_demod(int channel_rate,
						int audio_decim,
						double audio_pass,
						double audio_stop);

	gr_complex_to_mag_sptr d_mag;
	gr_add_const_ff_sptr d_dcr;
	std::vector<double> d_audio_taps;
	gr_fir_filter_fff_sptr d_lpf;
};