spandsp
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00001 /* 00002 * SpanDSP - a series of DSP components for telephony 00003 * 00004 * private/fsk.h - FSK modem transmit and receive parts 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 00026 #if !defined(_SPANDSP_PRIVATE_FSK_H_) 00027 #define _SPANDSP_PRIVATE_FSK_H_ 00028 00029 /*! 00030 FSK modem transmit descriptor. This defines the state of a single working 00031 instance of an FSK modem transmitter. 00032 */ 00033 struct fsk_tx_state_s 00034 { 00035 int baud_rate; 00036 /*! \brief The callback function used to get the next bit to be transmitted. */ 00037 get_bit_func_t get_bit; 00038 /*! \brief A user specified opaque pointer passed to the get_bit function. */ 00039 void *get_bit_user_data; 00040 00041 /*! \brief The callback function used to report modem status changes. */ 00042 modem_tx_status_func_t status_handler; 00043 /*! \brief A user specified opaque pointer passed to the status function. */ 00044 void *status_user_data; 00045 00046 int32_t phase_rates[2]; 00047 int16_t scaling; 00048 int32_t current_phase_rate; 00049 uint32_t phase_acc; 00050 int baud_frac; 00051 int shutdown; 00052 }; 00053 00054 /*! 00055 FSK modem receive descriptor. This defines the state of a single working 00056 instance of an FSK modem receiver. 00057 */ 00058 struct fsk_rx_state_s 00059 { 00060 int baud_rate; 00061 /*! \brief Synchronous/asynchronous framing control */ 00062 int framing_mode; 00063 /*! \brief The callback function used to put each bit received. */ 00064 put_bit_func_t put_bit; 00065 /*! \brief A user specified opaque pointer passed to the put_bit routine. */ 00066 void *put_bit_user_data; 00067 00068 /*! \brief The callback function used to report modem status changes. */ 00069 modem_tx_status_func_t status_handler; 00070 /*! \brief A user specified opaque pointer passed to the status function. */ 00071 void *status_user_data; 00072 00073 int32_t carrier_on_power; 00074 int32_t carrier_off_power; 00075 power_meter_t power; 00076 /*! \brief The value of the last signal sample, using the a simple HPF for signal power estimation. */ 00077 int16_t last_sample; 00078 /*! \brief >0 if a signal above the minimum is present. It may or may not be a V.29 signal. */ 00079 int signal_present; 00080 00081 int32_t phase_rate[2]; 00082 uint32_t phase_acc[2]; 00083 00084 int correlation_span; 00085 00086 complexi32_t window[2][FSK_MAX_WINDOW_LEN]; 00087 complexi32_t dot[2]; 00088 int buf_ptr; 00089 00090 int frame_state; 00091 int frame_bits; 00092 int baud_phase; 00093 int last_bit; 00094 int scaling_shift; 00095 }; 00096 00097 #endif 00098 /*- End of file ------------------------------------------------------------*/