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comparison spandsp-0.0.6pre17/tests/tone_detect_tests.c @ 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 * tone_detect_tests.c
5 *
6 * Written by Steve Underwood <steveu@coppice.org>
7 *
8 * Copyright (C) 2007 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 General Public License version 2, as
14 * 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 General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 * $Id: tone_detect_tests.c,v 1.12 2009/05/30 15:23:14 steveu Exp $
26 */
27
28 /*! \page tone_detect_tests_page Tone detection tests
29 \section tone_detect_tests_page_sec_1 What does it do?
30 */
31
32 #if defined(HAVE_CONFIG_H)
33 #include "config.h"
34 #endif
35
36 #include <stdlib.h>
37 #include <stdio.h>
38 #include <fcntl.h>
39 #include <string.h>
40 #include <time.h>
41 #include <sndfile.h>
42
43 //#if defined(WITH_SPANDSP_INTERNALS)
44 #define SPANDSP_EXPOSE_INTERNAL_STRUCTURES
45 //#endif
46
47 #include "spandsp.h"
48
49 #define DEC_SAMPLE_RATE 800
50 #define DEC_RATIO 10
51 #define BLOCK_LEN 56
52 #define PG_WINDOW 56
53 #define FREQ1 440.0f
54 #define FREQ2 480.0f
55
56 static int periodogram_tests(void)
57 {
58 int i;
59 int j;
60 int k;
61 int len;
62 complexf_t coeffs[PG_WINDOW/2];
63 complexf_t camp[BLOCK_LEN];
64 complexf_t last_result;
65 complexf_t result;
66 complexf_t phase_offset;
67 float freq_error;
68 float pg_scale;
69 float level;
70 float scale1;
71 float scale2;
72 int32_t phase_rate1;
73 int32_t phase_rate2;
74 uint32_t phase_acc1;
75 uint32_t phase_acc2;
76 awgn_state_t noise_source_re;
77 awgn_state_t noise_source_im;
78
79 phase_rate1 = DEC_RATIO*dds_phase_ratef(FREQ1 - 5.0f);
80 phase_rate2 = DEC_RATIO*dds_phase_ratef(FREQ2);
81 phase_acc1 = 0;
82 phase_acc2 = 0;
83 len = periodogram_generate_coeffs(coeffs, FREQ1, DEC_SAMPLE_RATE, PG_WINDOW);
84 if (len != PG_WINDOW/2)
85 {
86 printf("Test failed\n");
87 return -1;
88 }
89 pg_scale = periodogram_generate_phase_offset(&phase_offset, FREQ1, DEC_SAMPLE_RATE, PG_WINDOW);
90 scale1 = dds_scaling_dbm0f(-6.0f);
91 scale2 = dds_scaling_dbm0f(-6.0f);
92
93 for (k = -50; k < 0; k++)
94 {
95 printf("Setting noise to %ddBm0\n", k);
96 awgn_init_dbm0(&noise_source_re, 1234567, (float) k);
97 awgn_init_dbm0(&noise_source_im, 7654321, (float) k);
98 last_result = complex_setf(0.0f, 0.0f);
99 for (i = 0; i < 100; i++)
100 {
101 for (j = 0; j < PG_WINDOW; j++)
102 {
103 result = dds_complexf(&phase_acc1, phase_rate1);
104 camp[j].re = result.re*scale1;
105 camp[j].im = result.im*scale1;
106 result = dds_complexf(&phase_acc2, phase_rate2);
107 camp[j].re += result.re*scale2;
108 camp[j].im += result.im*scale2;
109 camp[j].re += awgn(&noise_source_re);
110 camp[j].im += awgn(&noise_source_im);
111 }
112 result = periodogram(coeffs, camp, PG_WINDOW);
113 level = sqrtf(result.re*result.re + result.im*result.im);
114 freq_error = periodogram_freq_error(&phase_offset, pg_scale, &last_result, &result);
115 last_result = result;
116 if (i == 0)
117 continue;
118
119 printf("Signal level = %.5f, freq error = %.5f\n", level, freq_error);
120 if (level < scale1*0.8f || level > scale1*1.2f)
121 {
122 printf("Test failed - %ddBm0 of noise, signal is %f (%f)\n", k, level, scale1);
123 return -1;
124 }
125 if (freq_error < -10.0f || freq_error > 10.0f)
126 {
127 printf("Test failed - %ddBm0 of noise, %fHz error\n", k, freq_error);
128 return -1;
129 }
130 }
131 }
132 return 0;
133 }
134 /*- End of function --------------------------------------------------------*/
135
136 int main(int argc, char *argv[])
137 {
138 if (periodogram_tests())
139 exit(2);
140 printf("Tests passed\n");
141 return 0;
142 }
143 /*- End of function --------------------------------------------------------*/
144 /*- End of file ------------------------------------------------------------*/

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