--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.3/spandsp-0.0.3/tests/power_meter_tests.c	Fri Jun 25 16:00:21 2010 +0200
@@ -0,0 +1,170 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * power_meter_tests.c
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2003 Steve Underwood
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id: power_meter_tests.c,v 1.15 2006/11/24 12:34:55 steveu Exp $
+ */
+
+/*! \page power_meter_tests_page Power meter tests
+\section power_meter_tests_page_sec_1 What does it do?
+These tests assess the accuracy of power meters built from the power meter module.
+Both tones and noise are used to check the meter's behaviour.
+
+\section power_meter_tests_page_sec_2 How does it work?
+???.
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <memory.h>
+#if defined(HAVE_TGMATH_H)
+#include <tgmath.h>
+#endif
+#if defined(HAVE_MATH_H)
+#include <math.h>
+#endif
+#include <time.h>
+#include <tiffio.h>
+
+#include "spandsp.h"
+
+int main(int argc, char *argv[])
+{
+    awgn_state_t noise_source;
+    power_meter_t meter;
+    tone_gen_descriptor_t tone_desc;
+    tone_gen_state_t gen;
+    int i;
+    int idum = 1234567;
+    int16_t amp[1000];
+    int len;
+    int32_t level;
+
+    power_meter_init(&meter, 7);
+
+    printf("Testing with a square wave 10dB from maximum\n");
+    for (i = 0;  i < 1000;  i++)
+    {
+        amp[i] = (i & 1)  ?  10362  :  -10362;
+        level = power_meter_update(&meter, amp[i]);
+        //printf("%12d %fdBm0 %fdBov\n", level, power_meter_dbm0(&meter), power_meter_dbov(&meter));
+    }
+    printf("Level: expected %" PRId32 "/%" PRId32 ", got %" PRId32 "\n", power_meter_level_dbov(-10.0f), power_meter_level_dbm0(-10.0f + DBM0_MAX_POWER), level);
+    printf("Power: expected %fdBm0, got %fdBm0\n", -10.0f + DBM0_MAX_POWER, power_meter_dbm0(&meter));
+    printf("Power: expected %fdBOv, got %fdBOv\n", -10.0f, power_meter_dbov(&meter));
+    if (level < power_meter_level_dbov(-10.0f)*0.99f
+        ||
+        level > power_meter_level_dbov(-10.0f)*1.01f)
+    {
+        printf("Test failed (level)\n");
+        exit(2);
+    }
+    if (0.1f < fabsf(power_meter_dbm0(&meter) + 10.0f - DBM0_MAX_POWER))
+    {
+        printf("Test failed (dBm0)\n");
+        exit(2);
+    }
+    if (0.1f < fabsf(power_meter_dbov(&meter) + 10.0))
+    {
+        printf("Test failed (dBOv)\n");
+        exit(2);
+    }
+
+    printf("Testing with a sine wave tone 10dB from maximum\n");
+    make_tone_gen_descriptor(&tone_desc,
+                             1000,
+                             -4,
+                             0,
+                             1,
+                             1,
+                             0,
+                             0,
+                             0,
+                             TRUE);
+    tone_gen_init(&gen, &tone_desc);
+    len = tone_gen(&gen, amp, 1000);
+    for (i = 0;  i < len;  i++)
+    {
+        level = power_meter_update(&meter, amp[i]);
+        //printf("%12d %fdBm0 %fdBov\n", level, power_meter_dbm0(&meter), power_meter_dbov(&meter));
+    }
+    printf("Level: expected %" PRId32 "/%" PRId32 ", got %" PRId32 "\n", power_meter_level_dbov(-10.0f), power_meter_level_dbm0(-10.0f + DBM0_MAX_POWER), level);
+    printf("Power: expected %fdBm0, got %fdBm0\n", -10.0f + DBM0_MAX_POWER, power_meter_dbm0(&meter));
+    printf("Power: expected %fdBOv, got %fdBOv\n", -10.0f, power_meter_dbov(&meter));
+    if (level < power_meter_level_dbov(-10.0f)*0.95f
+        ||
+        level > power_meter_level_dbov(-10.0f)*1.05f)
+    {
+        printf("Test failed (level)\n");
+        exit(2);
+    }
+    if (0.2f < fabsf(power_meter_dbm0(&meter) + 10.0f - DBM0_MAX_POWER))
+    {
+        printf("Test failed (dBm0)\n");
+        exit(2);
+    }
+    if (0.2f < fabsf(power_meter_dbov(&meter) + 10.0))
+    {
+        printf("Test failed (dBOv)\n");
+        exit(2);
+    }
+
+    printf("Testing with AWGN 10dB from maximum\n");
+    awgn_init_dbov(&noise_source, idum, -10.0f);
+    for (i = 0;  i < 1000;  i++)
+        amp[i] = awgn(&noise_source);
+    for (i = 0;  i < 1000;  i++)
+    {
+        level = power_meter_update(&meter, amp[i]);
+        //printf("%12d %fdBm0 %fdBov\n", level, power_meter_dbm0(&meter), power_meter_dbov(&meter));
+    }
+    printf("Level: expected %" PRId32 "/%" PRId32 ", got %" PRId32 "\n", power_meter_level_dbov(-10.0f), power_meter_level_dbm0(-10.0f + DBM0_MAX_POWER), level);
+    printf("Power: expected %fdBm0, got %fdBm0\n", -10.0f + DBM0_MAX_POWER, power_meter_dbm0(&meter));
+    printf("Power: expected %fdBOv, got %fdBOv\n", -10.0f, power_meter_dbov(&meter));
+    if (level < power_meter_level_dbov(-10.0f)*0.95f
+        ||
+        level > power_meter_level_dbov(-10.0f)*1.05f)
+    {
+        printf("Test failed (level)\n");
+        exit(2);
+    }
+    if (0.2f < fabsf(power_meter_dbm0(&meter) + 10.0f - DBM0_MAX_POWER))
+    {
+        printf("Test failed (dBm0)\n");
+        exit(2);
+    }
+    if (0.2f < fabsf(power_meter_dbov(&meter) + 10.0f))
+    {
+        printf("Test failed (dBOv)\n");
+        exit(2);
+    }
+    printf("Tests passed\n");
+    return  0;
+}
+/*- End of function --------------------------------------------------------*/
+/*- End of file ------------------------------------------------------------*/