--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/tests/tone_detect_tests.c	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,144 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * tone_detect_tests.c
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2007 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: tone_detect_tests.c,v 1.12 2009/05/30 15:23:14 steveu Exp $
+ */
+
+/*! \page tone_detect_tests_page Tone detection tests
+\section tone_detect_tests_page_sec_1 What does it do?
+*/
+
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <string.h>
+#include <time.h>
+#include <sndfile.h>
+
+//#if defined(WITH_SPANDSP_INTERNALS)
+#define SPANDSP_EXPOSE_INTERNAL_STRUCTURES
+//#endif
+
+#include "spandsp.h"
+
+#define DEC_SAMPLE_RATE     800
+#define DEC_RATIO           10
+#define BLOCK_LEN           56
+#define PG_WINDOW           56
+#define FREQ1               440.0f
+#define FREQ2               480.0f
+
+static int periodogram_tests(void)
+{
+    int i;
+    int j;
+    int k;
+    int len;
+    complexf_t coeffs[PG_WINDOW/2];
+    complexf_t camp[BLOCK_LEN];
+    complexf_t last_result;
+    complexf_t result;
+    complexf_t phase_offset;
+    float freq_error;
+    float pg_scale;
+    float level;
+    float scale1;
+    float scale2;
+    int32_t phase_rate1;
+    int32_t phase_rate2;
+    uint32_t phase_acc1;
+    uint32_t phase_acc2;
+    awgn_state_t noise_source_re;
+    awgn_state_t noise_source_im;
+
+    phase_rate1 = DEC_RATIO*dds_phase_ratef(FREQ1 - 5.0f);
+    phase_rate2 = DEC_RATIO*dds_phase_ratef(FREQ2);
+    phase_acc1 = 0;
+    phase_acc2 = 0;
+    len = periodogram_generate_coeffs(coeffs, FREQ1, DEC_SAMPLE_RATE, PG_WINDOW);
+    if (len != PG_WINDOW/2)
+    {
+        printf("Test failed\n");
+        return -1;
+    }
+    pg_scale = periodogram_generate_phase_offset(&phase_offset, FREQ1, DEC_SAMPLE_RATE, PG_WINDOW);
+    scale1 = dds_scaling_dbm0f(-6.0f);
+    scale2 = dds_scaling_dbm0f(-6.0f);
+
+    for (k = -50;  k < 0;  k++)
+    {
+        printf("Setting noise to %ddBm0\n", k);
+        awgn_init_dbm0(&noise_source_re, 1234567, (float) k);
+        awgn_init_dbm0(&noise_source_im, 7654321, (float) k);
+        last_result = complex_setf(0.0f, 0.0f);
+        for (i = 0;  i < 100;  i++)
+        {
+            for (j = 0;  j < PG_WINDOW;  j++)
+            {
+                result = dds_complexf(&phase_acc1, phase_rate1);
+                camp[j].re = result.re*scale1;
+                camp[j].im = result.im*scale1;
+                result = dds_complexf(&phase_acc2, phase_rate2);
+                camp[j].re += result.re*scale2;
+                camp[j].im += result.im*scale2;
+                camp[j].re += awgn(&noise_source_re);
+                camp[j].im += awgn(&noise_source_im);
+            }
+            result = periodogram(coeffs, camp, PG_WINDOW);
+            level = sqrtf(result.re*result.re + result.im*result.im);
+            freq_error = periodogram_freq_error(&phase_offset, pg_scale, &last_result, &result);
+            last_result = result;
+            if (i == 0)
+                continue;
+
+            printf("Signal level = %.5f, freq error = %.5f\n", level, freq_error);
+            if (level < scale1*0.8f  ||  level > scale1*1.2f)
+            {
+                printf("Test failed - %ddBm0 of noise, signal is %f (%f)\n", k, level, scale1);
+                return -1;
+            }
+            if (freq_error < -10.0f  ||  freq_error > 10.0f)
+            {
+                printf("Test failed - %ddBm0 of noise, %fHz error\n", k, freq_error);
+                return -1;
+            }
+        }
+    }
+    return  0;
+}
+/*- End of function --------------------------------------------------------*/
+
+int main(int argc, char *argv[])
+{
+    if (periodogram_tests())
+        exit(2);
+    printf("Tests passed\n");
+    return  0;
+}
+/*- End of function --------------------------------------------------------*/
+/*- End of file ------------------------------------------------------------*/