/usr/include/codec2/modem_stats.h is in libcodec2-dev 0.5.1-1+b2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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FILE........: modem_stats.h
AUTHOR......: David Rowe
DATE CREATED: June 2015
Common structure for returning demod stats from fdmdv and cohpsk modems.
\*---------------------------------------------------------------------------*/
/*
Copyright (C) 2015 David Rowe
All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License version 2.1, as
published by the Free Software Foundation. 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 Lesser General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifdef __cplusplus
extern "C" {
#endif
#ifndef __MODEM_STATS__
#define __MODEM_STATS__
#include "comp.h"
#include "kiss_fft.h"
#define MODEM_STATS_NC_MAX 20
#define MODEM_STATS_NR_MAX 6
#define MODEM_STATS_NSPEC 512
#define MODEM_STATS_MAX_F_HZ 4000
struct MODEM_STATS {
int Nc;
float snr_est; /* estimated SNR of rx signal in dB (3 kHz noise BW) */
COMP rx_symbols[MODEM_STATS_NR_MAX][MODEM_STATS_NC_MAX+1];
/* latest received symbols, for scatter plot */
int nr; /* number of rows in rx_symbols */
int sync; /* demod sync state */
float foff; /* estimated freq offset in Hz */
float rx_timing; /* estimated optimum timing offset in samples */
float clock_offset; /* Estimated tx/rx sample clock offset in ppm */
/* Buf for FFT/waterfall */
float fft_buf[2*MODEM_STATS_NSPEC];
kiss_fft_cfg fft_cfg;
};
void modem_stats_open(struct MODEM_STATS *f);
void modem_stats_close(struct MODEM_STATS *f);
void modem_stats_get_rx_spectrum(struct MODEM_STATS *f, float mag_spec_dB[], COMP rx_fdm[], int nin);
#endif
#ifdef __cplusplus
}
#endif
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