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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 * power_meter_tests.c
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5 *
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6 * Written by Steve Underwood <steveu@coppice.org>
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7 *
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8 * Copyright (C) 2003 Steve Underwood
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9 *
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10 * All rights reserved.
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11 *
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12 * This program is free software; you can redistribute it and/or modify
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13 * it under the terms of the GNU General Public License version 2, as
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14 * published by the Free Software Foundation.
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15 *
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16 * This program is distributed in the hope that it will be useful,
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17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 * GNU General Public License for more details.
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20 *
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21 * You should have received a copy of the GNU General Public License
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22 * along with this program; if not, write to the Free Software
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23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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24 *
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25 * $Id: power_meter_tests.c,v 1.15 2006/11/24 12:34:55 steveu Exp $
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26 */
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27
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28 /*! \page power_meter_tests_page Power meter tests
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29 \section power_meter_tests_page_sec_1 What does it do?
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30 These tests assess the accuracy of power meters built from the power meter module.
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31 Both tones and noise are used to check the meter's behaviour.
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32
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33 \section power_meter_tests_page_sec_2 How does it work?
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34 ???.
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35 */
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36
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37 #ifdef HAVE_CONFIG_H
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38 #include <config.h>
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39 #endif
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40
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41 #include <stdlib.h>
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42 #include <inttypes.h>
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43 #include <stdio.h>
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44 #include <memory.h>
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45 #if defined(HAVE_TGMATH_H)
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46 #include <tgmath.h>
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47 #endif
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48 #if defined(HAVE_MATH_H)
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49 #include <math.h>
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50 #endif
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51 #include <time.h>
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52 #include <tiffio.h>
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53
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54 #include "spandsp.h"
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55
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56 int main(int argc, char *argv[])
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57 {
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58 awgn_state_t noise_source;
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59 power_meter_t meter;
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60 tone_gen_descriptor_t tone_desc;
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61 tone_gen_state_t gen;
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62 int i;
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63 int idum = 1234567;
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64 int16_t amp[1000];
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65 int len;
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66 int32_t level;
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67
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68 power_meter_init(&meter, 7);
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69
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70 printf("Testing with a square wave 10dB from maximum\n");
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71 for (i = 0; i < 1000; i++)
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72 {
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73 amp[i] = (i & 1) ? 10362 : -10362;
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74 level = power_meter_update(&meter, amp[i]);
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75 //printf("%12d %fdBm0 %fdBov\n", level, power_meter_dbm0(&meter), power_meter_dbov(&meter));
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76 }
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77 printf("Level: expected %" PRId32 "/%" PRId32 ", got %" PRId32 "\n", power_meter_level_dbov(-10.0f), power_meter_level_dbm0(-10.0f + DBM0_MAX_POWER), level);
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78 printf("Power: expected %fdBm0, got %fdBm0\n", -10.0f + DBM0_MAX_POWER, power_meter_dbm0(&meter));
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79 printf("Power: expected %fdBOv, got %fdBOv\n", -10.0f, power_meter_dbov(&meter));
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80 if (level < power_meter_level_dbov(-10.0f)*0.99f
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81 ||
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82 level > power_meter_level_dbov(-10.0f)*1.01f)
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83 {
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84 printf("Test failed (level)\n");
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85 exit(2);
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86 }
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87 if (0.1f < fabsf(power_meter_dbm0(&meter) + 10.0f - DBM0_MAX_POWER))
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88 {
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89 printf("Test failed (dBm0)\n");
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90 exit(2);
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91 }
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92 if (0.1f < fabsf(power_meter_dbov(&meter) + 10.0))
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93 {
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94 printf("Test failed (dBOv)\n");
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95 exit(2);
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96 }
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97
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98 printf("Testing with a sine wave tone 10dB from maximum\n");
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99 make_tone_gen_descriptor(&tone_desc,
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100 1000,
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101 -4,
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102 0,
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103 1,
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104 1,
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105 0,
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106 0,
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107 0,
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108 TRUE);
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109 tone_gen_init(&gen, &tone_desc);
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110 len = tone_gen(&gen, amp, 1000);
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111 for (i = 0; i < len; i++)
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112 {
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113 level = power_meter_update(&meter, amp[i]);
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114 //printf("%12d %fdBm0 %fdBov\n", level, power_meter_dbm0(&meter), power_meter_dbov(&meter));
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115 }
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116 printf("Level: expected %" PRId32 "/%" PRId32 ", got %" PRId32 "\n", power_meter_level_dbov(-10.0f), power_meter_level_dbm0(-10.0f + DBM0_MAX_POWER), level);
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117 printf("Power: expected %fdBm0, got %fdBm0\n", -10.0f + DBM0_MAX_POWER, power_meter_dbm0(&meter));
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118 printf("Power: expected %fdBOv, got %fdBOv\n", -10.0f, power_meter_dbov(&meter));
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119 if (level < power_meter_level_dbov(-10.0f)*0.95f
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120 ||
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121 level > power_meter_level_dbov(-10.0f)*1.05f)
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122 {
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123 printf("Test failed (level)\n");
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124 exit(2);
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125 }
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126 if (0.2f < fabsf(power_meter_dbm0(&meter) + 10.0f - DBM0_MAX_POWER))
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127 {
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128 printf("Test failed (dBm0)\n");
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129 exit(2);
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130 }
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131 if (0.2f < fabsf(power_meter_dbov(&meter) + 10.0))
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132 {
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133 printf("Test failed (dBOv)\n");
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134 exit(2);
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135 }
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136
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137 printf("Testing with AWGN 10dB from maximum\n");
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138 awgn_init_dbov(&noise_source, idum, -10.0f);
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139 for (i = 0; i < 1000; i++)
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140 amp[i] = awgn(&noise_source);
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141 for (i = 0; i < 1000; i++)
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142 {
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143 level = power_meter_update(&meter, amp[i]);
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144 //printf("%12d %fdBm0 %fdBov\n", level, power_meter_dbm0(&meter), power_meter_dbov(&meter));
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145 }
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146 printf("Level: expected %" PRId32 "/%" PRId32 ", got %" PRId32 "\n", power_meter_level_dbov(-10.0f), power_meter_level_dbm0(-10.0f + DBM0_MAX_POWER), level);
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147 printf("Power: expected %fdBm0, got %fdBm0\n", -10.0f + DBM0_MAX_POWER, power_meter_dbm0(&meter));
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148 printf("Power: expected %fdBOv, got %fdBOv\n", -10.0f, power_meter_dbov(&meter));
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149 if (level < power_meter_level_dbov(-10.0f)*0.95f
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150 ||
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151 level > power_meter_level_dbov(-10.0f)*1.05f)
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152 {
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153 printf("Test failed (level)\n");
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154 exit(2);
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155 }
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156 if (0.2f < fabsf(power_meter_dbm0(&meter) + 10.0f - DBM0_MAX_POWER))
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157 {
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158 printf("Test failed (dBm0)\n");
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159 exit(2);
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160 }
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161 if (0.2f < fabsf(power_meter_dbov(&meter) + 10.0f))
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162 {
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163 printf("Test failed (dBOv)\n");
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164 exit(2);
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165 }
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166 printf("Tests passed\n");
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167 return 0;
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168 }
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169 /*- End of function --------------------------------------------------------*/
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170 /*- End of file ------------------------------------------------------------*/
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