186 lines
7.4 KiB
C
186 lines
7.4 KiB
C
/*
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* SpanDSP - a series of DSP components for telephony
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*
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* private/v22bis.h - ITU V.22bis modem
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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) 2004 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: v22bis.h,v 1.4 2009/04/17 14:37:53 steveu Exp $
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*/
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#if !defined(_SPANDSP_PRIVATE_V22BIS_H_)
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#define _SPANDSP_PRIVATE_V22BIS_H_
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/*!
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V.22bis modem descriptor. This defines the working state for a single instance
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of a V.22bis modem.
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*/
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struct v22bis_state_s
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{
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/*! \brief The bit rate of the modem. Valid values are 1200 and 2400. */
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int bit_rate;
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/*! \brief TRUE is this is the calling side modem. */
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int caller;
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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 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 callback routines. */
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void *user_data;
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/*! \brief The callback function used to report modem status changes. */
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modem_rx_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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/* RECEIVE SECTION */
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struct
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{
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/*! \brief The route raised cosine (RRC) pulse shaping filter buffer. */
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float rrc_filter[2*V22BIS_RX_FILTER_STEPS];
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/*! \brief Current offset into the RRC pulse shaping filter buffer. */
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int rrc_filter_step;
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/*! \brief The register for the data scrambler. */
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unsigned int scramble_reg;
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/*! \brief A counter for the number of consecutive bits of repeating pattern through
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the scrambler. */
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int scrambler_pattern_count;
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/*! \brief 0 if receiving user data. A training stage value during training */
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int training;
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/*! \brief A count of how far through the current training step we are. */
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int training_count;
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/*! \brief >0 if a signal above the minimum is present. It may or may not be a V.22bis signal. */
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int signal_present;
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/*! \brief A measure of how much mismatch there is between the real constellation,
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and the decoded symbol positions. */
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float training_error;
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/*! \brief The current phase of the carrier (i.e. the DDS parameter). */
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uint32_t carrier_phase;
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/*! \brief The update rate for the phase of the carrier (i.e. the DDS increment). */
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int32_t carrier_phase_rate;
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/*! \brief The proportional part of the carrier tracking filter. */
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float carrier_track_p;
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/*! \brief The integral part of the carrier tracking filter. */
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float carrier_track_i;
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int scrambled_ones_to_date;
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/*! \brief A callback function which may be enabled to report every symbol's
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constellation position. */
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qam_report_handler_t qam_report;
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/*! \brief A user specified opaque pointer passed to the qam_report callback
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routine. */
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void *qam_user_data;
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/*! \brief A power meter, to measure the HPF'ed signal power in the channel. */
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power_meter_t rx_power;
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/*! \brief The power meter level at which carrier on is declared. */
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int32_t carrier_on_power;
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/*! \brief The power meter level at which carrier off is declared. */
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int32_t carrier_off_power;
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/*! \brief The scaling factor accessed by the AGC algorithm. */
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float agc_scaling;
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int constellation_state;
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/*! \brief The current delta factor for updating the equalizer coefficients. */
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float eq_delta;
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#if defined(SPANDSP_USE_FIXED_POINTx)
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/*! \brief The adaptive equalizer coefficients. */
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complexi_t eq_coeff[2*V22BIS_EQUALIZER_LEN + 1];
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/*! \brief The equalizer signal buffer. */
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complexi_t eq_buf[V22BIS_EQUALIZER_MASK + 1];
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#else
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complexf_t eq_coeff[2*V22BIS_EQUALIZER_LEN + 1];
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complexf_t eq_buf[V22BIS_EQUALIZER_MASK + 1];
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#endif
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/*! \brief Current offset into the equalizer buffer. */
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int eq_step;
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/*! \brief Current write offset into the equalizer buffer. */
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int eq_put_step;
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/*! \brief Integration variable for damping the Gardner algorithm tests. */
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int gardner_integrate;
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/*! \brief Current step size of Gardner algorithm integration. */
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int gardner_step;
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/*! \brief The total symbol timing correction since the carrier came up.
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This is only for performance analysis purposes. */
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int total_baud_timing_correction;
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/*! \brief The current fractional phase of the baud timing. */
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int baud_phase;
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int sixteen_way_decisions;
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int detected_unscrambled_ones;
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int detected_unscrambled_zeros;
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int detected_2400bps_markers;
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} rx;
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/* TRANSMIT SECTION */
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struct
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{
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/*! \brief The gain factor needed to achieve the specified output power. */
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float gain;
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/*! \brief The route raised cosine (RRC) pulse shaping filter buffer. */
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complexf_t rrc_filter[2*V22BIS_TX_FILTER_STEPS];
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/*! \brief Current offset into the RRC pulse shaping filter buffer. */
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int rrc_filter_step;
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/*! \brief The register for the data scrambler. */
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unsigned int scramble_reg;
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/*! \brief A counter for the number of consecutive bits of repeating pattern through
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the scrambler. */
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int scrambler_pattern_count;
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/*! \brief 0 if transmitting user data. A training stage value during training */
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int training;
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/*! \brief A counter used to track progress through sending the training sequence. */
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int training_count;
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/*! \brief The current phase of the carrier (i.e. the DDS parameter). */
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uint32_t carrier_phase;
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/*! \brief The update rate for the phase of the carrier (i.e. the DDS increment). */
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int32_t carrier_phase_rate;
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/*! \brief The current phase of the guard tone (i.e. the DDS parameter). */
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uint32_t guard_phase;
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/*! \brief The update rate for the phase of the guard tone (i.e. the DDS increment). */
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int32_t guard_phase_rate;
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float guard_level;
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/*! \brief The current fractional phase of the baud timing. */
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int baud_phase;
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/*! \brief The code number for the current position in the constellation. */
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int constellation_state;
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/*! \brief An indicator to mark that we are tidying up to stop transmission. */
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int shutdown;
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/*! \brief The get_bit function in use at any instant. */
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get_bit_func_t current_get_bit;
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} tx;
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/*! \brief Error and flow logging control */
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logging_state_t logging;
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};
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#endif
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/*- End of file ------------------------------------------------------------*/
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