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5
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1 /*
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2 * SpanDSP - a series of DSP components for telephony
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3 *
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4 * bell_mf_tests.c - Test the Bell MF detector against the spec., whatever the
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5 * spec. may be :)
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6 *
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7 * Written by Steve Underwood <steveu@coppice.org>
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8 *
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9 * Copyright (C) 2003 Steve Underwood
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10 *
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11 * All rights reserved.
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12 *
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13 * This program is free software; you can redistribute it and/or modify
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14 * it under the terms of the GNU General Public License version 2, as
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15 * published by the Free Software Foundation.
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16 *
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17 * This program is distributed in the hope that it will be useful,
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18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 * GNU General Public License for more details.
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21 *
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22 * You should have received a copy of the GNU General Public License
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23 * along with this program; if not, write to the Free Software
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24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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25 *
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26 * $Id: bell_mf_rx_tests.c,v 1.6 2006/11/19 14:07:26 steveu Exp $
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27 */
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28
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29 /*! \file */
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30
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31 /*! \page bell_mf_tests_page Bell MF tone generation and detection tests
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32 \section bell_mf_tests_page_sec_1 What does it do?
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33 These tests are fashioned after those on the CM7291 test tape from
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34 Mitel. Those tests are for DTMF, rather than Bell MF, but make a
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35 fair starting point for a set of meaningful tests of Bell MF.
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36
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37 These tests include conversion to and from A-law. It is assumed the
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38 distortion this produces is comparable to u-law, so it should be
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39 a fair test of performance in a real PSTN channel.
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40 */
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41
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42 #ifdef HAVE_CONFIG_H
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43 #include "config.h"
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44 #endif
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45
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46 #include <inttypes.h>
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47 #include <stdlib.h>
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48 #include <string.h>
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49 #if defined(HAVE_TGMATH_H)
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50 #include <tgmath.h>
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51 #endif
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52 #if defined(HAVE_MATH_H)
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53 #include <math.h>
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54 #endif
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55 #include <stdio.h>
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56 #include <time.h>
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57 #include <fcntl.h>
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58 #include <audiofile.h>
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59 #include <tiffio.h>
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60
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61 #include "spandsp.h"
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62
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63 /* Basic Bell MF specs:
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64 *
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65 * Signal generation:
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66 * Tone on time = KP: 100+-7ms. All other signals: 68+-7ms
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67 * Tone off time (between digits) = 68+-7ms
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68 * Frequency tolerance +- 1.5%
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69 * Signal level -7+-1dBm per frequency
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70 *
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71 * Signal reception:
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72 * Frequency tolerance +- 1.5% +-10Hz
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73 * Signal level -14dBm to 0dBm
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74 * Perform a "two and only two tones present" test.
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75 * Twist <= 6dB accepted
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76 * Receiver sensitive to signals above -22dBm per frequency
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77 * Test for a minimum of 55ms if KP, or 30ms of other signals.
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78 * Signals to be recognised if the two tones arrive within 8ms of each other.
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79 * Invalid signals result in the return of the re-order tone.
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80 */
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81
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82 #define MF_DURATION (68*8)
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83 #define MF_PAUSE (68*8)
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84 #define MF_CYCLE (MF_DURATION + MF_PAUSE)
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85
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86 typedef struct
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87 {
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88 float f1; /* First freq */
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89 float f2; /* Second freq */
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90 int8_t level1; /* Level of the first freq (dB) */
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91 int8_t level2; /* Level of the second freq (dB) */
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92 uint8_t on_time; /* Tone on time (ms) */
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93 uint8_t off_time; /* Minimum post tone silence (ms) */
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94 } mf_digit_tones_t;
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95
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96 static const mf_digit_tones_t bell_mf_tones[] =
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97 {
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98 { 700.0, 900.0, -7, -7, 68, 68},
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99 { 700.0, 1100.0, -7, -7, 68, 68},
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100 { 900.0, 1100.0, -7, -7, 68, 68},
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101 { 700.0, 1300.0, -7, -7, 68, 68},
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102 { 900.0, 1300.0, -7, -7, 68, 68},
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103 {1100.0, 1300.0, -7, -7, 68, 68},
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104 { 700.0, 1500.0, -7, -7, 68, 68},
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105 { 900.0, 1500.0, -7, -7, 68, 68},
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106 {1100.0, 1500.0, -7, -7, 68, 68},
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107 {1300.0, 1500.0, -7, -7, 68, 68},
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108 { 700.0, 1700.0, -7, -7, 68, 68}, /* ST''' - use 'C' */
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109 { 900.0, 1700.0, -7, -7, 68, 68}, /* ST' - use 'A' */
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110 {1100.0, 1700.0, -7, -7, 100, 68}, /* KP - use '*' */
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111 {1300.0, 1700.0, -7, -7, 68, 68}, /* ST'' - use 'B' */
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112 {1500.0, 1700.0, -7, -7, 68, 68}, /* ST - use '#' */
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113 {0.0, 0.0, 0, 0, 0, 0}
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114 };
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115
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116 static tone_gen_descriptor_t my_mf_digit_tones[16];
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117
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118 static char bell_mf_tone_codes[] = "1234567890CA*B#";
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119
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120 int callback_ok;
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121 int callback_roll;
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122
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123 static void my_mf_gen_init(float low_fudge,
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124 int low_level,
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125 float high_fudge,
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126 int high_level,
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127 int duration,
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128 int gap)
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129 {
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130 int i;
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131
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132 /* The fiddle factor on the tone duration is to make KP consistently
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133 50% longer than the other digits, as the digit durations are varied
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134 for the tests. This is an approximation, as the real scaling should
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135 be 100/68 */
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136 for (i = 0; i < 15; i++)
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137 {
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138 make_tone_gen_descriptor(&my_mf_digit_tones[i],
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139 bell_mf_tones[i].f1*(1.0 + low_fudge),
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140 low_level,
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141 bell_mf_tones[i].f2*(1.0 + high_fudge),
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142 high_level,
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143 (i == 12) ? 3*duration/2 : duration,
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144 gap,
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145 0,
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146 0,
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147 FALSE);
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148 }
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149 }
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150 /*- End of function --------------------------------------------------------*/
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151
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152 static int my_mf_generate(int16_t amp[], const char *digits)
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153 {
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154 int len;
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155 char *cp;
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156 tone_gen_state_t tone;
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157
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158 len = 0;
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159 while (*digits)
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160 {
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161 if ((cp = strchr(bell_mf_tone_codes, *digits)))
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162 {
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163 tone_gen_init(&tone, &my_mf_digit_tones[cp - bell_mf_tone_codes]);
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164 len += tone_gen(&tone, amp + len, 9999);
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165 }
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166 digits++;
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167 }
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168 return len;
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169 }
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170 /*- End of function --------------------------------------------------------*/
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171
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172 static void codec_munge(int16_t amp[], int len)
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173 {
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174 int i;
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175 uint8_t alaw;
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176
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177 for (i = 0; i < len; i++)
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178 {
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179 alaw = linear_to_alaw (amp[i]);
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180 amp[i] = alaw_to_linear (alaw);
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181 }
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182 }
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183 /*- End of function --------------------------------------------------------*/
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184
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185 #define ALL_POSSIBLE_DIGITS "1234567890CA*B#"
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186
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187 static void digit_delivery(void *data, const char *digits, int len)
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188 {
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189 int i;
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190 int seg;
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191 const char *s = ALL_POSSIBLE_DIGITS;
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192 const char *t;
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193
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194 if (data == (void *) 0x12345678)
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195 {
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196 callback_ok = TRUE;
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197 t = s + callback_roll;
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198 seg = 15 - callback_roll;
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199 for (i = 0; i < len; i += seg, seg = 15)
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200 {
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201 if (i + seg > len)
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202 seg = len - i;
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203 if (memcmp(digits + i, t, seg))
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204 {
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205 callback_ok = FALSE;
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206 printf("Fail at %d %d\n", i, seg);
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207 break;
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208 }
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209 t = s;
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210 callback_roll = (callback_roll + seg)%15;
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211 }
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212 }
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213 else
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214 {
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215 callback_ok = FALSE;
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216 }
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217 }
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218 /*- End of function --------------------------------------------------------*/
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219
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220 static int16_t amp[1000000];
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221
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222 int main(int argc, char *argv[])
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223 {
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224 int duration;
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225 int i;
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226 int j;
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227 int len;
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228 int sample;
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229 const char *s;
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230 char digit[2];
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231 char buf[MAX_BELL_MF_DIGITS + 1];
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232 int actual;
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233 int nplus;
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234 int nminus;
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235 float rrb;
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236 float rcfo;
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237 time_t now;
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238 bell_mf_rx_state_t mf_state;
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239 awgn_state_t noise_source;
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240
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241 time(&now);
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242 bell_mf_rx_init(&mf_state, NULL, NULL);
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243
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244 /* Test 1: Mitel's test 1 isn't really a test. Its a calibration step,
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245 which has no meaning here. */
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246 printf ("Test 1: Calibration\n");
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247 printf (" Passed\n");
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248
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249 /* Test 2: Decode check
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250 This is a sanity check, that all digits are reliably detected
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251 under ideal conditions. Each possible digit is repeated 10 times,
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252 with 68ms bursts. The level of each tone is about 6dB down from clip */
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253 printf ("Test 2: Decode check\n");
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254 my_mf_gen_init(0.0, -3, 0.0, -3, 68, 68);
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255 s = ALL_POSSIBLE_DIGITS;
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256 digit[1] = '\0';
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257 while (*s)
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258 {
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259 digit[0] = *s++;
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260 for (i = 0; i < 10; i++)
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261 {
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262 len = my_mf_generate(amp, digit);
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263 codec_munge(amp, len);
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264 bell_mf_rx(&mf_state, amp, len);
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265 actual = bell_mf_rx_get(&mf_state, buf, 128);
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266 if (actual != 1 || buf[0] != digit[0])
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267 {
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268 printf (" Sent '%s'\n", digit);
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269 printf (" Received '%s' [%d]\n", buf, actual);
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270 printf (" Failed\n");
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271 exit (2);
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272 }
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273 }
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274 }
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275 printf (" Passed\n");
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276
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277 /* Test 3: Recognition bandwidth and channel centre frequency check.
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278 Use all digits. Each digit types requires four tests to complete
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279 the check. Each section contains 40 pulses of 68ms duration,
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280 with an amplitude of -20dB from clip per frequency.
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281
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282 Four sections covering the tests for one tone (1 digit) are:
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283 a. H frequency at 0% deviation from center, L frequency at +0.1%.
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284 L frequency is then increments in +01.% steps up to +4%. The
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285 number of tone bursts is noted and designated N+.
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286 b. H frequency at 0% deviation, L frequency at -0.1%. L frequency
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287 is then incremental in -0.1% steps, up to -4%. The number of
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288 tone bursts is noted and designated N-.
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289 c. The test in (a) is repeated with the L frequency at 0% and the
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290 H frequency varied up to +4%.
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291 d. The test in (b) is repeated with the L frequency and 0% and the
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292 H frequency varied to -4%.
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293
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294 Receiver Recognition Bandwidth (RRB) is calculated as follows:
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295 RRB% = (N+ + N-)/10
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296 Receiver Center Frequency Offset (RCFO) is calculated as follows:
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297 RCFO% = X + (N+ - N-)/20
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298
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299 Note that this test doesn't test what it says it is testing at all,
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300 and the results are quite inaccurate, if not a downright lie! However,
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301 it follows the Mitel procedure, so how can it be bad? :)
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302
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303 The spec calls for +-1.5% +-10Hz of bandwidth.
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304 */
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305 printf ("Test 3: Recognition bandwidth and channel centre frequency check\n");
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306 s = ALL_POSSIBLE_DIGITS;
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307 digit[1] = '\0';
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308 j = 0;
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309 while (*s)
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310 {
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311 digit[0] = *s++;
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312 for (nplus = 0, i = 1; i <= 60; i++)
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313 {
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314 my_mf_gen_init((float) i/1000.0, -17, 0.0, -17, 68, 68);
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315 len = my_mf_generate(amp, digit);
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316 codec_munge(amp, len);
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317 bell_mf_rx(&mf_state, amp, len);
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318 nplus += bell_mf_rx_get(&mf_state, buf, 128);
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319 }
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320 for (nminus = 0, i = -1; i >= -60; i--)
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321 {
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322 my_mf_gen_init((float) i/1000.0, -17, 0.0, -17, 68, 68);
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323 len = my_mf_generate(amp, digit);
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324 codec_munge(amp, len);
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325 bell_mf_rx(&mf_state, amp, len);
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326 nminus += bell_mf_rx_get(&mf_state, buf, 128);
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327 }
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328 rrb = (float) (nplus + nminus)/10.0;
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329 rcfo = (float) (nplus - nminus)/10.0;
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330 printf (" %c (low) rrb = %5.2f%%, rcfo = %5.2f%%, max -ve = %5.2f, max +ve = %5.2f\n",
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331 digit[0],
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332 rrb,
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333 rcfo,
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334 (float) nminus/10.0,
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335 (float) nplus/10.0);
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336
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337 if (rrb < 3.0 + rcfo + (2.0*100.0*10.0/bell_mf_tones[j].f1) || rrb >= 15.0 + rcfo)
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338 {
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339 printf (" Failed\n");
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340 exit (2);
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341 }
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342
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343 for (nplus = 0, i = 1; i <= 60; i++)
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344 {
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345 my_mf_gen_init(0.0, -17, (float) i/1000.0, -17, 68, 68);
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346 len = my_mf_generate(amp, digit);
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347 codec_munge(amp, len);
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348 bell_mf_rx(&mf_state, amp, len);
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349 nplus += bell_mf_rx_get(&mf_state, buf, 128);
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350 }
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351 for (nminus = 0, i = -1; i >= -60; i--)
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352 {
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353 my_mf_gen_init(0.0, -17, (float) i/1000.0, -17, 68, 68);
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354 len = my_mf_generate(amp, digit);
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355 codec_munge(amp, len);
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356 bell_mf_rx(&mf_state, amp, len);
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357 nminus += bell_mf_rx_get(&mf_state, buf, 128);
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358 }
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359 rrb = (float) (nplus + nminus)/10.0;
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360 rcfo = (float) (nplus - nminus)/10.0;
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361 printf (" %c (high) rrb = %5.2f%%, rcfo = %5.2f%%, max -ve = %5.2f, max +ve = %5.2f\n",
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362 digit[0],
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363 rrb,
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364 rcfo,
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365 (float) nminus/10.0,
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366 (float) nplus/10.0);
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367 if (rrb < 3.0 + rcfo + (2.0*100.0*10.0/bell_mf_tones[j].f2) || rrb >= 15.0 + rcfo)
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368 {
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369 printf (" Failed\n");
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370 exit (2);
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371 }
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372 j++;
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373 }
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374 printf (" Passed\n");
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375
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376 /* Test 4: Acceptable amplitude ratio (twist).
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377 Twist all digits in both directions, and check the maximum twist
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378 we can accept. The way this is done is styled after the Mitel DTMF
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379 test, and has good and bad points. */
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380
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381 printf ("Test 4: Acceptable amplitude ratio (twist)\n");
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382 s = ALL_POSSIBLE_DIGITS;
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383 digit[1] = '\0';
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384 while (*s)
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385 {
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386 digit[0] = *s++;
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387 for (nplus = 0, i = -50; i >= -250; i--)
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388 {
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389 my_mf_gen_init(0.0, -5, 0.0, i/10, 68, 68);
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390
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391 len = my_mf_generate(amp, digit);
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392 codec_munge(amp, len);
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393 bell_mf_rx(&mf_state, amp, len);
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394 nplus += bell_mf_rx_get(&mf_state, buf, 128);
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395 }
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396 printf(" %c normal twist = %.2fdB\n", digit[0], (float) nplus/10.0);
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397 if (nplus < 60)
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398 {
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399 printf(" Failed\n");
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400 exit(2);
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401 }
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402 for (nminus = 0, i = -50; i >= -250; i--)
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403 {
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404 my_mf_gen_init(0.0, i/10, 0.0, -5, 68, 68);
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405
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406 len = my_mf_generate(amp, digit);
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407 codec_munge(amp, len);
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408 bell_mf_rx(&mf_state, amp, len);
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409 nminus += bell_mf_rx_get(&mf_state, buf, 128);
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410 }
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411 printf(" %c reverse twist = %.2fdB\n", digit[0], (float) nminus/10.0);
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412 if (nminus < 60)
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413 {
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414 printf(" Failed\n");
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415 exit(2);
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416 }
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417 }
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418 printf(" Passed\n");
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419
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420 /* Test 5: Dynamic range
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421 This test sends all possible digits, with gradually increasing
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422 amplitude. We determine the span over which we achieve reliable
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423 detection. The spec says we should detect between -14dBm and 0dBm,
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424 but the tones clip above -3dBm, so this cannot really work. */
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425
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426 printf("Test 5: Dynamic range\n");
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427 for (nplus = nminus = -1000, i = -50; i <= 3; i++)
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428 {
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429 my_mf_gen_init(0.0, i, 0.0, i, 68, 68);
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430 for (j = 0; j < 100; j++)
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431 {
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432 len = my_mf_generate(amp, ALL_POSSIBLE_DIGITS);
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433 codec_munge(amp, len);
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434 bell_mf_rx(&mf_state, amp, len);
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435 if (bell_mf_rx_get(&mf_state, buf, 128) != 15)
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436 break;
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437 if (strcmp(buf, ALL_POSSIBLE_DIGITS) != 0)
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438 break;
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439 }
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440 if (j == 100)
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441 {
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442 if (nplus == -1000)
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443 nplus = i;
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444 }
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445 else
|
|
|
446 {
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447 if (nplus != -1000 && nminus == -1000)
|
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448 nminus = i;
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|
|
449 }
|
|
|
450 }
|
|
|
451 printf(" Dynamic range = %ddB to %ddB\n", nplus, nminus - 1);
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|
|
452 if (nplus > -22 || nminus <= -3)
|
|
|
453 {
|
|
|
454 printf(" Failed\n");
|
|
|
455 exit(2);
|
|
|
456 }
|
|
|
457 printf(" Passed\n");
|
|
|
458
|
|
|
459 /* Test 6: Guard time
|
|
|
460 This test sends all possible digits, with a gradually reducing
|
|
|
461 duration. The spec defines a narrow range of tone duration
|
|
|
462 times we can expect, so as long as we detect reliably at the
|
|
|
463 specified minimum we should be OK. However, the spec also says
|
|
|
464 we should detect on a minimum of 55ms of KP, or 30ms of other
|
|
|
465 digits. */
|
|
|
466
|
|
|
467 printf("Test 6: Guard time\n");
|
|
|
468 for (i = 30; i < 62; i++)
|
|
|
469 {
|
|
|
470 my_mf_gen_init(0.0, -5, 0.0, -3, i, 68);
|
|
|
471 for (j = 0; j < 500; j++)
|
|
|
472 {
|
|
|
473 len = my_mf_generate(amp, ALL_POSSIBLE_DIGITS);
|
|
|
474 codec_munge(amp, len);
|
|
|
475 bell_mf_rx(&mf_state, amp, len);
|
|
|
476
|
|
|
477 if (bell_mf_rx_get(&mf_state, buf, 128) != 15)
|
|
|
478 break;
|
|
|
479 if (strcmp(buf, ALL_POSSIBLE_DIGITS) != 0)
|
|
|
480 break;
|
|
|
481 }
|
|
|
482 if (j == 500)
|
|
|
483 break;
|
|
|
484 }
|
|
|
485 printf(" Guard time = %dms\n", i);
|
|
|
486 if (i > 61)
|
|
|
487 {
|
|
|
488 printf(" Failed\n");
|
|
|
489 exit(2);
|
|
|
490 }
|
|
|
491 printf(" Passed\n");
|
|
|
492
|
|
|
493 /* Test 7: Acceptable signal to noise ratio
|
|
|
494 We send all possible digits at -6dBm from clip, mixed with AWGN.
|
|
|
495 We gradually reduce the noise until we get clean detection. */
|
|
|
496
|
|
|
497 printf("Test 7: Acceptable signal to noise ratio\n");
|
|
|
498 my_mf_gen_init(0.0, -3, 0.0, -3, 68, 68);
|
|
|
499 for (i = -10; i > -50; i--)
|
|
|
500 {
|
|
|
501 awgn_init_dbm0(&noise_source, 1234567, (float) i);
|
|
|
502 for (j = 0; j < 500; j++)
|
|
|
503 {
|
|
|
504 len = my_mf_generate(amp, ALL_POSSIBLE_DIGITS);
|
|
|
505 for (sample = 0; sample < len; sample++)
|
|
|
506 amp[sample] = saturate(amp[sample] + awgn(&noise_source));
|
|
|
507 codec_munge(amp, len);
|
|
|
508 bell_mf_rx(&mf_state, amp, len);
|
|
|
509
|
|
|
510 if (bell_mf_rx_get(&mf_state, buf, 128) != 15)
|
|
|
511 break;
|
|
|
512 if (strcmp(buf, ALL_POSSIBLE_DIGITS) != 0)
|
|
|
513 break;
|
|
|
514 }
|
|
|
515 if (j == 500)
|
|
|
516 break;
|
|
|
517 }
|
|
|
518 printf(" Acceptable S/N ratio is %ddB\n", -3 - i);
|
|
|
519 if (-3 - i > 26)
|
|
|
520 {
|
|
|
521 printf(" Failed\n");
|
|
|
522 exit(2);
|
|
|
523 }
|
|
|
524 printf(" Passed\n");
|
|
|
525
|
|
|
526 /* The remainder of the Mitel tape is the talk-off test. This is
|
|
|
527 meaningless for Bell MF. However the decoder's tolerance of
|
|
|
528 out of band noise is significant. */
|
|
|
529 /* TODO: add a OOB tolerance test. */
|
|
|
530
|
|
|
531 /* Test the callback mode for delivering detected digits */
|
|
|
532
|
|
|
533 printf("Test: Callback digit delivery mode.\n");
|
|
|
534 callback_ok = FALSE;
|
|
|
535 callback_roll = 0;
|
|
|
536 bell_mf_rx_init(&mf_state, digit_delivery, (void *) 0x12345678);
|
|
|
537 my_mf_gen_init(0.0, -10, 0.0, -10, 68, 68);
|
|
|
538 for (i = 1; i < 10; i++)
|
|
|
539 {
|
|
|
540 len = 0;
|
|
|
541 for (j = 0; j < i; j++)
|
|
|
542 len += my_mf_generate(amp + len, ALL_POSSIBLE_DIGITS);
|
|
|
543 bell_mf_rx(&mf_state, amp, len);
|
|
|
544 if (!callback_ok)
|
|
|
545 break;
|
|
|
546 }
|
|
|
547 if (!callback_ok)
|
|
|
548 {
|
|
|
549 printf(" Failed\n");
|
|
|
550 exit (2);
|
|
|
551 }
|
|
|
552 printf(" Passed\n");
|
|
|
553
|
|
|
554 duration = time (NULL) - now;
|
|
|
555 printf ("Tests passed in %ds\n", duration);
|
|
|
556 return 0;
|
|
|
557 }
|
|
|
558 /*- End of function --------------------------------------------------------*/
|
|
|
559 /*- End of file ------------------------------------------------------------*/
|
