00001 /* 00002 * SpanDSP - a series of DSP components for telephony 00003 * 00004 * private/v27ter_tx.h - ITU V.27ter modem transmit part 00005 * 00006 * Written by Steve Underwood <steveu@coppice.org> 00007 * 00008 * Copyright (C) 2003 Steve Underwood 00009 * 00010 * All rights reserved. 00011 * 00012 * This program is free software; you can redistribute it and/or modify 00013 * it under the terms of the GNU Lesser General Public License version 2.1, 00014 * as published by the Free Software Foundation. 00015 * 00016 * This program is distributed in the hope that it will be useful, 00017 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00018 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00019 * GNU Lesser General Public License for more details. 00020 * 00021 * You should have received a copy of the GNU Lesser General Public 00022 * License along with this program; if not, write to the Free Software 00023 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 00024 * 00025 * $Id: v27ter_tx.h,v 1.3 2009/07/09 13:52:09 steveu Exp $ 00026 */ 00027 00028 #if !defined(_SPANDSP_PRIVATE_V27TER_TX_H_) 00029 #define _SPANDSP_PRIVATE_V27TER_TX_H_ 00030 00031 /*! The number of taps in the pulse shaping/bandpass filter */ 00032 #define V27TER_TX_FILTER_STEPS 9 00033 00034 /*! 00035 V.27ter modem transmit side descriptor. This defines the working state for a 00036 single instance of a V.27ter modem transmitter. 00037 */ 00038 struct v27ter_tx_state_s 00039 { 00040 /*! \brief The bit rate of the modem. Valid values are 2400 and 4800. */ 00041 int bit_rate; 00042 /*! \brief The callback function used to get the next bit to be transmitted. */ 00043 get_bit_func_t get_bit; 00044 /*! \brief A user specified opaque pointer passed to the get_bit function. */ 00045 void *get_bit_user_data; 00046 00047 /*! \brief The callback function used to report modem status changes. */ 00048 modem_tx_status_func_t status_handler; 00049 /*! \brief A user specified opaque pointer passed to the status function. */ 00050 void *status_user_data; 00051 00052 #if defined(SPANDSP_USE_FIXED_POINT) 00053 /*! \brief The gain factor needed to achieve the specified output power at 2400bps. */ 00054 int32_t gain_2400; 00055 /*! \brief The gain factor needed to achieve the specified output power at 4800bps. */ 00056 int32_t gain_4800; 00057 #else 00058 /*! \brief The gain factor needed to achieve the specified output power at 2400bps. */ 00059 float gain_2400; 00060 /*! \brief The gain factor needed to achieve the specified output power at 4800bps. */ 00061 float gain_4800; 00062 #endif 00063 /*! \brief The route raised cosine (RRC) pulse shaping filter buffer. */ 00064 #if defined(SPANDSP_USE_FIXED_POINT) 00065 complexi16_t rrc_filter[2*V27TER_TX_FILTER_STEPS]; 00066 #else 00067 complexf_t rrc_filter[2*V27TER_TX_FILTER_STEPS]; 00068 #endif 00069 /*! \brief Current offset into the RRC pulse shaping filter buffer. */ 00070 int rrc_filter_step; 00071 00072 /*! \brief The register for the training and data scrambler. */ 00073 unsigned int scramble_reg; 00074 /*! \brief A counter for the number of consecutive bits of repeating pattern through 00075 the scrambler. */ 00076 int scrambler_pattern_count; 00077 /*! \brief TRUE if transmitting the training sequence, or shutting down transmission. 00078 FALSE if transmitting user data. */ 00079 int in_training; 00080 /*! \brief A counter used to track progress through sending the training sequence. */ 00081 int training_step; 00082 00083 /*! \brief The current phase of the carrier (i.e. the DDS parameter). */ 00084 uint32_t carrier_phase; 00085 /*! \brief The update rate for the phase of the carrier (i.e. the DDS increment). */ 00086 int32_t carrier_phase_rate; 00087 /*! \brief The current fractional phase of the baud timing. */ 00088 int baud_phase; 00089 /*! \brief The code number for the current position in the constellation. */ 00090 int constellation_state; 00091 /*! \brief The get_bit function in use at any instant. */ 00092 get_bit_func_t current_get_bit; 00093 /*! \brief Error and flow logging control */ 00094 logging_state_t logging; 00095 }; 00096 00097 #endif 00098 /*- End of file ------------------------------------------------------------*/