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comparison spandsp-0.0.6pre17/src/spandsp/private/fsk.h @ 4:26cd8f1ef0b1

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import spandsp-0.0.6pre17
author Peter Meerwald <pmeerw@cosy.sbg.ac.at>
date Fri, 25 Jun 2010 15:50:58 +0200
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3:c6c5a16ce2f2 4:26cd8f1ef0b1
1 /*
2 * SpanDSP - a series of DSP components for telephony
3 *
4 * private/fsk.h - FSK modem transmit and receive parts
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: fsk.h,v 1.5 2009/04/01 13:22:40 steveu Exp $
26 */
27
28 #if !defined(_SPANDSP_PRIVATE_FSK_H_)
29 #define _SPANDSP_PRIVATE_FSK_H_
30
31 /*!
32 FSK modem transmit descriptor. This defines the state of a single working
33 instance of an FSK modem transmitter.
34 */
35 struct fsk_tx_state_s
36 {
37 int baud_rate;
38 /*! \brief The callback function used to get the next bit to be transmitted. */
39 get_bit_func_t get_bit;
40 /*! \brief A user specified opaque pointer passed to the get_bit function. */
41 void *get_bit_user_data;
42
43 /*! \brief The callback function used to report modem status changes. */
44 modem_tx_status_func_t status_handler;
45 /*! \brief A user specified opaque pointer passed to the status function. */
46 void *status_user_data;
47
48 int32_t phase_rates[2];
49 int16_t scaling;
50 int32_t current_phase_rate;
51 uint32_t phase_acc;
52 int baud_frac;
53 int shutdown;
54 };
55
56 /*!
57 FSK modem receive descriptor. This defines the state of a single working
58 instance of an FSK modem receiver.
59 */
60 struct fsk_rx_state_s
61 {
62 int baud_rate;
63 /*! \brief Synchronous/asynchronous framing control */
64 int framing_mode;
65 /*! \brief The callback function used to put each bit received. */
66 put_bit_func_t put_bit;
67 /*! \brief A user specified opaque pointer passed to the put_bit routine. */
68 void *put_bit_user_data;
69
70 /*! \brief The callback function used to report modem status changes. */
71 modem_tx_status_func_t status_handler;
72 /*! \brief A user specified opaque pointer passed to the status function. */
73 void *status_user_data;
74
75 int32_t carrier_on_power;
76 int32_t carrier_off_power;
77 power_meter_t power;
78 /*! \brief The value of the last signal sample, using the a simple HPF for signal power estimation. */
79 int16_t last_sample;
80 /*! \brief >0 if a signal above the minimum is present. It may or may not be a V.29 signal. */
81 int signal_present;
82
83 int32_t phase_rate[2];
84 uint32_t phase_acc[2];
85
86 int correlation_span;
87
88 complexi32_t window[2][FSK_MAX_WINDOW_LEN];
89 complexi32_t dot[2];
90 int buf_ptr;
91
92 int frame_state;
93 int frame_bits;
94 int baud_phase;
95 int last_bit;
96 int scaling_shift;
97 };
98
99 #endif
100 /*- End of file ------------------------------------------------------------*/

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