Mercurial > hg > audiostuff
comparison spandsp-0.0.6pre17/src/spandsp/private/v29tx.h @ 4:26cd8f1ef0b1
import spandsp-0.0.6pre17
| author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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| date | Fri, 25 Jun 2010 15:50:58 +0200 |
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| 3:c6c5a16ce2f2 | 4:26cd8f1ef0b1 |
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| 1 /* | |
| 2 * SpanDSP - a series of DSP components for telephony | |
| 3 * | |
| 4 * private/v29tx.h - ITU V.29 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 * $Id: v29tx.h,v 1.2 2009/07/09 13:52:09 steveu Exp $ | |
| 26 */ | |
| 27 | |
| 28 #if !defined(_SPANDSP_PRIVATE_V29TX_H_) | |
| 29 #define _SPANDSP_PRIVATE_V29TX_H_ | |
| 30 | |
| 31 /*! The number of taps in the pulse shaping/bandpass filter */ | |
| 32 #define V29_TX_FILTER_STEPS 9 | |
| 33 | |
| 34 /*! | |
| 35 V.29 modem transmit side descriptor. This defines the working state for a | |
| 36 single instance of a V.29 modem transmitter. | |
| 37 */ | |
| 38 struct v29_tx_state_s | |
| 39 { | |
| 40 /*! \brief The bit rate of the modem. Valid values are 4800, 7200 and 9600. */ | |
| 41 int bit_rate; | |
| 42 /*! \brief The callback function used to get the next bit to be transmitted. */ | |
| 43 get_bit_func_t get_bit; | |
| 44 /*! \brief A user specified opaque pointer passed to the get_bit function. */ | |
| 45 void *get_bit_user_data; | |
| 46 | |
| 47 /*! \brief The callback function used to report modem status changes. */ | |
| 48 modem_tx_status_func_t status_handler; | |
| 49 /*! \brief A user specified opaque pointer passed to the status function. */ | |
| 50 void *status_user_data; | |
| 51 | |
| 52 /*! \brief Gain required to achieve the specified output power, not allowing | |
| 53 for the size of the current constellation. */ | |
| 54 float base_gain; | |
| 55 /*! \brief Gain required to achieve the specified output power, allowing | |
| 56 for the size of the current constellation. */ | |
| 57 #if defined(SPANDSP_USE_FIXED_POINT) | |
| 58 int32_t gain; | |
| 59 #else | |
| 60 float gain; | |
| 61 #endif | |
| 62 | |
| 63 /*! \brief The route raised cosine (RRC) pulse shaping filter buffer. */ | |
| 64 #if defined(SPANDSP_USE_FIXED_POINT) | |
| 65 complexi16_t rrc_filter[2*V29_TX_FILTER_STEPS]; | |
| 66 #else | |
| 67 complexf_t rrc_filter[2*V29_TX_FILTER_STEPS]; | |
| 68 #endif | |
| 69 /*! \brief Current offset into the RRC pulse shaping filter buffer. */ | |
| 70 int rrc_filter_step; | |
| 71 | |
| 72 /*! \brief The register for the data scrambler. */ | |
| 73 unsigned int scramble_reg; | |
| 74 /*! \brief The register for the training scrambler. */ | |
| 75 uint8_t training_scramble_reg; | |
| 76 /*! \brief TRUE if transmitting the training sequence, or shutting down transmission. | |
| 77 FALSE if transmitting user data. */ | |
| 78 int in_training; | |
| 79 /*! \brief A counter used to track progress through sending the training sequence. */ | |
| 80 int training_step; | |
| 81 /*! \brief An offset value into the table of training parameters, used to match the | |
| 82 training pattern to the bit rate. */ | |
| 83 int training_offset; | |
| 84 | |
| 85 /*! \brief The current phase of the carrier (i.e. the DDS parameter). */ | |
| 86 uint32_t carrier_phase; | |
| 87 /*! \brief The update rate for the phase of the carrier (i.e. the DDS increment). */ | |
| 88 int32_t carrier_phase_rate; | |
| 89 /*! \brief The current fractional phase of the baud timing. */ | |
| 90 int baud_phase; | |
| 91 /*! \brief The code number for the current position in the constellation. */ | |
| 92 int constellation_state; | |
| 93 /*! \brief The get_bit function in use at any instant. */ | |
| 94 get_bit_func_t current_get_bit; | |
| 95 /*! \brief Error and flow logging control */ | |
| 96 logging_state_t logging; | |
| 97 }; | |
| 98 | |
| 99 #endif | |
| 100 /*- End of file ------------------------------------------------------------*/ |