spandsp 0.0.6
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 int32_t gain_2400;
53 /*! \brief The gain factor needed to achieve the specified output power at 4800bps. */
54 int32_t gain_4800;
55 /*! \brief The root raised cosine (RRC) pulse shaping filter buffer. */
56 complexi16_t rrc_filter[2*V27TER_TX_FILTER_STEPS];
57#else
58 /*! \brief The gain factor needed to achieve the specified output power at 2400bps. */
59 float gain_2400;
60 /*! \brief The gain factor needed to achieve the specified output power at 4800bps. */
61 float gain_4800;
62 /*! \brief The root raised cosine (RRC) pulse shaping filter buffer. */
63 complexf_t rrc_filter[2*V27TER_TX_FILTER_STEPS];
64#endif
65 /*! \brief Current offset into the RRC pulse shaping filter buffer. */
67
68 /*! \brief The register for the training and data scrambler. */
69 uint32_t scramble_reg;
70 /*! \brief A counter for the number of consecutive bits of repeating pattern through
71 the scrambler. */
73 /*! \brief TRUE if transmitting the training sequence, or shutting down transmission.
74 FALSE if transmitting user data. */
76 /*! \brief A counter used to track progress through sending the training sequence. */
78
79 /*! \brief The current phase of the carrier (i.e. the DDS parameter). */
80 uint32_t carrier_phase;
81 /*! \brief The update rate for the phase of the carrier (i.e. the DDS increment). */
83 /*! \brief The current fractional phase of the baud timing. */
85 /*! \brief The code number for the current position in the constellation. */
87 /*! \brief The get_bit function in use at any instant. */
89 /*! \brief Error and flow logging control */
91};
92
93#endif
94/*- End of file ------------------------------------------------------------*/
void(* modem_status_func_t)(void *user_data, int status)
Definition async.h:114
int(* get_bit_func_t)(void *user_data)
Definition async.h:108
struct logging_state_s logging_state_t
Definition logging.h:75
Definition complex.h:43
Definition complex.h:89
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:82
uint32_t scramble_reg
The register for the training and data scrambler.
Definition private/v27ter_tx.h:69
get_bit_func_t get_bit
The callback function used to get the next bit to be transmitted.
Definition private/v27ter_tx.h:41
void * get_bit_user_data
A user specified opaque pointer passed to the get_bit function.
Definition private/v27ter_tx.h:43
int baud_phase
The current fractional phase of the baud timing.
Definition private/v27ter_tx.h:84
modem_status_func_t status_handler
The callback function used to report modem status changes.
Definition private/v27ter_tx.h:46
get_bit_func_t current_get_bit
The get_bit function in use at any instant.
Definition private/v27ter_tx.h:88
float gain_2400
The gain factor needed to achieve the specified output power at 2400bps.
Definition private/v27ter_tx.h:59
int scrambler_pattern_count
A counter for the number of consecutive bits of repeating pattern through the scrambler.
Definition private/v27ter_tx.h:72
int rrc_filter_step
Current offset into the RRC pulse shaping filter buffer.
Definition private/v27ter_tx.h:66
logging_state_t logging
Error and flow logging control.
Definition private/v27ter_tx.h:90
int training_step
A counter used to track progress through sending the training sequence.
Definition private/v27ter_tx.h:77
int in_training
TRUE if transmitting the training sequence, or shutting down transmission. FALSE if transmitting user...
Definition private/v27ter_tx.h:75
complexf_t rrc_filter[2 *9]
The root raised cosine (RRC) pulse shaping filter buffer.
Definition private/v27ter_tx.h:63
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:86
uint32_t carrier_phase
The current phase of the carrier (i.e. the DDS parameter).
Definition private/v27ter_tx.h:80
float gain_4800
The gain factor needed to achieve the specified output power at 4800bps.
Definition private/v27ter_tx.h:61