Mercurial > hg > audiostuff
comparison spandsp-0.0.6pre17/src/spandsp/private/v17tx.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/v17tx.h - ITU V.17 modem transmit part | |
| 5 * | |
| 6 * Written by Steve Underwood <steveu@coppice.org> | |
| 7 * | |
| 8 * Copyright (C) 2004 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: v17tx.h,v 1.2.4.1 2009/12/24 16:52:30 steveu Exp $ | |
| 26 */ | |
| 27 | |
| 28 /*! \file */ | |
| 29 | |
| 30 #if !defined(_SPANDSP_PRIVATE_V17TX_H_) | |
| 31 #define _SPANDSP_PRIVATE_V17TX_H_ | |
| 32 | |
| 33 /*! The number of taps in the pulse shaping/bandpass filter */ | |
| 34 #define V17_TX_FILTER_STEPS 9 | |
| 35 | |
| 36 /*! | |
| 37 V.17 modem transmit side descriptor. This defines the working state for a | |
| 38 single instance of a V.17 modem transmitter. | |
| 39 */ | |
| 40 struct v17_tx_state_s | |
| 41 { | |
| 42 /*! \brief The bit rate of the modem. Valid values are 4800, 7200 and 9600. */ | |
| 43 int bit_rate; | |
| 44 /*! \brief The callback function used to get the next bit to be transmitted. */ | |
| 45 get_bit_func_t get_bit; | |
| 46 /*! \brief A user specified opaque pointer passed to the get_bit function. */ | |
| 47 void *get_bit_user_data; | |
| 48 | |
| 49 /*! \brief The callback function used to report modem status changes. */ | |
| 50 modem_tx_status_func_t status_handler; | |
| 51 /*! \brief A user specified opaque pointer passed to the status function. */ | |
| 52 void *status_user_data; | |
| 53 | |
| 54 /*! \brief The gain factor needed to achieve the specified output power. */ | |
| 55 #if defined(SPANDSP_USE_FIXED_POINT) | |
| 56 int32_t gain; | |
| 57 #else | |
| 58 float gain; | |
| 59 #endif | |
| 60 | |
| 61 /*! \brief The route raised cosine (RRC) pulse shaping filter buffer. */ | |
| 62 #if defined(SPANDSP_USE_FIXED_POINT) | |
| 63 complexi16_t rrc_filter[2*V17_TX_FILTER_STEPS]; | |
| 64 #else | |
| 65 complexf_t rrc_filter[2*V17_TX_FILTER_STEPS]; | |
| 66 #endif | |
| 67 /*! \brief Current offset into the RRC pulse shaping filter buffer. */ | |
| 68 int rrc_filter_step; | |
| 69 | |
| 70 /*! \brief The current state of the differential encoder. */ | |
| 71 int diff; | |
| 72 /*! \brief The current state of the convolutional encoder. */ | |
| 73 int convolution; | |
| 74 /*! \brief The code number for the current position in the constellation. */ | |
| 75 int constellation_state; | |
| 76 | |
| 77 /*! \brief The register for the data scrambler. */ | |
| 78 uint32_t scramble_reg; | |
| 79 /*! \brief Scrambler tap */ | |
| 80 //int scrambler_tap; | |
| 81 /*! \brief TRUE if transmitting the training sequence. FALSE if transmitting user data. */ | |
| 82 int in_training; | |
| 83 /*! \brief TRUE if the short training sequence is to be used. */ | |
| 84 int short_train; | |
| 85 /*! \brief A counter used to track progress through sending the training sequence. */ | |
| 86 int training_step; | |
| 87 | |
| 88 /*! \brief The current phase of the carrier (i.e. the DDS parameter). */ | |
| 89 uint32_t carrier_phase; | |
| 90 /*! \brief The update rate for the phase of the carrier (i.e. the DDS increment). */ | |
| 91 int32_t carrier_phase_rate; | |
| 92 /*! \brief The current fractional phase of the baud timing. */ | |
| 93 int baud_phase; | |
| 94 | |
| 95 /*! \brief A pointer to the constellation currently in use. */ | |
| 96 #if defined(SPANDSP_USE_FIXED_POINT) | |
| 97 const complexi16_t *constellation; | |
| 98 #else | |
| 99 const complexf_t *constellation; | |
| 100 #endif | |
| 101 /*! \brief The current number of data bits per symbol. This does not include | |
| 102 the redundant bit. */ | |
| 103 int bits_per_symbol; | |
| 104 /*! \brief The get_bit function in use at any instant. */ | |
| 105 get_bit_func_t current_get_bit; | |
| 106 /*! \brief Error and flow logging control */ | |
| 107 logging_state_t logging; | |
| 108 }; | |
| 109 | |
| 110 #endif | |
| 111 /*- End of file ------------------------------------------------------------*/ |