spandsp 3.0.0
private/v27ter_tx.h
1/*
2 * SpanDSP - a series of DSP components for telephony
3 *
4 * private/v27ter_tx.h - ITU V.27ter modem transmit part
5 *
6 * Written by Steve Underwood <steveu@coppice.org>
7 *
8 * Copyright (C) 2003 Steve Underwood
9 *
10 * All rights reserved.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Lesser General Public License version 2.1,
14 * as published by the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26#if !defined(_SPANDSP_PRIVATE_V27TER_TX_H_)
27#define _SPANDSP_PRIVATE_V27TER_TX_H_
28
29/*! The number of taps in the pulse shaping/bandpass filter */
30#define V27TER_TX_FILTER_STEPS 9
31
32/*!
33 V.27ter modem transmit side descriptor. This defines the working state for a
34 single instance of a V.27ter modem transmitter.
35*/
37{
38 /*! \brief The bit rate of the modem. Valid values are 2400 and 4800. */
40 /*! \brief The callback function used to get the next bit to be transmitted. */
42 /*! \brief A user specified opaque pointer passed to the get_bit function. */
44
45 /*! \brief The callback function used to report modem status changes. */
47 /*! \brief A user specified opaque pointer passed to the status function. */
49
50#if defined(SPANDSP_USE_FIXED_POINT)
51 /*! \brief The gain factor needed to achieve the specified output power at 2400bps. */
52 int16_t gain_2400;
53 /*! \brief The gain factor needed to achieve the specified output power at 4800bps. */
54 int16_t gain_4800;
55 /*! \brief The root raised cosine (RRC) pulse shaping filter buffer. */
56 int16_t rrc_filter_re[V27TER_TX_FILTER_STEPS];
57 int16_t rrc_filter_im[V27TER_TX_FILTER_STEPS];
58#else
59 /*! \brief The gain factor needed to achieve the specified output power at 2400bps. */
60 float gain_2400;
61 /*! \brief The gain factor needed to achieve the specified output power at 4800bps. */
62 float gain_4800;
63 /*! \brief The root raised cosine (RRC) pulse shaping filter buffer. */
64 float rrc_filter_re[V27TER_TX_FILTER_STEPS];
65 float rrc_filter_im[V27TER_TX_FILTER_STEPS];
66#endif
67
68 /*! \brief Current offset into the RRC pulse shaping filter buffer. */
70
71 /*! \brief The register for the training and data scrambler. */
72 uint32_t scramble_reg;
73 /*! \brief A counter for the number of consecutive bits of repeating pattern through
74 the scrambler. */
76 /*! \brief True if transmitting the training sequence, or shutting down transmission.
77 False if transmitting user data. */
79 /*! \brief A counter used to track progress through sending the training sequence. */
81
82 /*! \brief The current phase of the carrier (i.e. the DDS parameter). */
83 uint32_t carrier_phase;
84 /*! \brief The update rate for the phase of the carrier (i.e. the DDS increment). */
86 /*! \brief The current fractional phase of the baud timing. */
88 /*! \brief The code number for the current position in the constellation. */
90 /*! \brief The get_bit function in use at any instant. */
92 /*! \brief Error and flow logging control */
94};
95
96#endif
97/*- End of file ------------------------------------------------------------*/
int(* span_get_bit_func_t)(void *user_data)
Definition async.h:127
void(* span_modem_status_func_t)(void *user_data, int status)
Definition async.h:131
struct logging_state_s logging_state_t
Definition logging.h:72
Definition private/v27ter_tx.h:37
int bit_rate
The bit rate of the modem. Valid values are 2400 and 4800.
Definition private/v27ter_tx.h:39
int32_t carrier_phase_rate
The update rate for the phase of the carrier (i.e. the DDS increment).
Definition private/v27ter_tx.h:85
uint32_t scramble_reg
The register for the training and data scrambler.
Definition private/v27ter_tx.h:72
span_modem_status_func_t status_handler
The callback function used to report modem status changes.
Definition private/v27ter_tx.h:46
void * get_bit_user_data
A user specified opaque pointer passed to the get_bit function.
Definition private/v27ter_tx.h:43
bool in_training
True if transmitting the training sequence, or shutting down transmission. False if transmitting user...
Definition private/v27ter_tx.h:78
int baud_phase
The current fractional phase of the baud timing.
Definition private/v27ter_tx.h:87
span_get_bit_func_t current_get_bit
The get_bit function in use at any instant.
Definition private/v27ter_tx.h:91
float gain_2400
The gain factor needed to achieve the specified output power at 2400bps.
Definition private/v27ter_tx.h:60
int scrambler_pattern_count
A counter for the number of consecutive bits of repeating pattern through the scrambler.
Definition private/v27ter_tx.h:75
int rrc_filter_step
Current offset into the RRC pulse shaping filter buffer.
Definition private/v27ter_tx.h:69
logging_state_t logging
Error and flow logging control.
Definition private/v27ter_tx.h:93
int training_step
A counter used to track progress through sending the training sequence.
Definition private/v27ter_tx.h:80
void * status_user_data
A user specified opaque pointer passed to the status function.
Definition private/v27ter_tx.h:48
int constellation_state
The code number for the current position in the constellation.
Definition private/v27ter_tx.h:89
uint32_t carrier_phase
The current phase of the carrier (i.e. the DDS parameter).
Definition private/v27ter_tx.h:83
float rrc_filter_re[9]
The root raised cosine (RRC) pulse shaping filter buffer.
Definition private/v27ter_tx.h:64
float gain_4800
The gain factor needed to achieve the specified output power at 4800bps.
Definition private/v27ter_tx.h:62
span_get_bit_func_t get_bit
The callback function used to get the next bit to be transmitted.
Definition private/v27ter_tx.h:41