101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
/*
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* SpanDSP - a series of DSP components for telephony
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*
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* private/fsk.h - FSK modem transmit and receive parts
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*
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* Written by Steve Underwood <steveu@coppice.org>
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*
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* Copyright (C) 2003 Steve Underwood
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*
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* All rights reserved.
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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 Lesser General Public License version 2.1,
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* as published by the Free Software Foundation.
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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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id: fsk.h,v 1.5 2009/04/01 13:22:40 steveu Exp $
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*/
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#if !defined(_SPANDSP_PRIVATE_FSK_H_)
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#define _SPANDSP_PRIVATE_FSK_H_
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/*!
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FSK modem transmit descriptor. This defines the state of a single working
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instance of an FSK modem transmitter.
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*/
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struct fsk_tx_state_s
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{
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int baud_rate;
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/*! \brief The callback function used to get the next bit to be transmitted. */
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get_bit_func_t get_bit;
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/*! \brief A user specified opaque pointer passed to the get_bit function. */
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void *get_bit_user_data;
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/*! \brief The callback function used to report modem status changes. */
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modem_tx_status_func_t status_handler;
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/*! \brief A user specified opaque pointer passed to the status function. */
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void *status_user_data;
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int32_t phase_rates[2];
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int16_t scaling;
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int32_t current_phase_rate;
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uint32_t phase_acc;
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int baud_frac;
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int shutdown;
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};
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/*!
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FSK modem receive descriptor. This defines the state of a single working
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instance of an FSK modem receiver.
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*/
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struct fsk_rx_state_s
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{
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int baud_rate;
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/*! \brief Synchronous/asynchronous framing control */
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int framing_mode;
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/*! \brief The callback function used to put each bit received. */
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put_bit_func_t put_bit;
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/*! \brief A user specified opaque pointer passed to the put_bit routine. */
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void *put_bit_user_data;
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/*! \brief The callback function used to report modem status changes. */
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modem_tx_status_func_t status_handler;
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/*! \brief A user specified opaque pointer passed to the status function. */
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void *status_user_data;
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int32_t carrier_on_power;
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int32_t carrier_off_power;
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power_meter_t power;
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/*! \brief The value of the last signal sample, using the a simple HPF for signal power estimation. */
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int16_t last_sample;
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/*! \brief >0 if a signal above the minimum is present. It may or may not be a V.29 signal. */
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int signal_present;
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int32_t phase_rate[2];
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uint32_t phase_acc[2];
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int correlation_span;
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complexi32_t window[2][FSK_MAX_WINDOW_LEN];
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complexi32_t dot[2];
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int buf_ptr;
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int frame_state;
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int frame_bits;
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int baud_phase;
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int last_bit;
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int scaling_shift;
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};
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#endif
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/*- End of file ------------------------------------------------------------*/
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