forked from Mirrors/freeswitch
595 lines
18 KiB
C
595 lines
18 KiB
C
/*
|
|
* SpanDSP - a series of DSP components for telephony
|
|
*
|
|
* r2_mf_tests.c - Test the R2 MF detector against the spec., whatever the
|
|
* spec. may be :)
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/*! \file */
|
|
|
|
/*! \page r2_mf_tests_page R2 MF tone generation and detection tests
|
|
\section r2_mf_tests_page_sec_1 What does it do?
|
|
These tests are fashioned after those on the CM7291 test tape from
|
|
Mitel. Those tests are for DTMF, rather than R2 MF, but make a
|
|
fair starting point for a set of meaningful tests of R2 MF.
|
|
|
|
These tests include conversion to and from A-law. It is assumed the
|
|
distortion this produces is comparable to u-law, so it should be
|
|
a fair test of performance in a real PSTN channel.
|
|
*/
|
|
|
|
#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>
|
|
|
|
#define SPANDSP_EXPOSE_INTERNAL_STRUCTURES
|
|
|
|
#include "spandsp.h"
|
|
|
|
/* R2 tone generation specs.
|
|
* Power: -11.5dBm +- 1dB
|
|
* Frequency: within +-4Hz
|
|
* Mismatch between the start time of a pair of tones: <=1ms.
|
|
* Mismatch between the end time of a pair of tones: <=1ms.
|
|
*/
|
|
/* Basic MFC/R2 tone detection specs:
|
|
* Receiver response range: -5dBm to -35dBm
|
|
* Difference in level for a pair of frequencies
|
|
* Adjacent tones: <5dB
|
|
* Non-adjacent tones: <7dB
|
|
* Receiver not to detect a signal of 2 frequencies of level -5dB and
|
|
* duration <7ms.
|
|
* Receiver not to recognise a signal of 2 frequencies having a difference
|
|
* in level >=20dB.
|
|
* Max received signal frequency error: +-10Hz
|
|
* The sum of the operate and release times of a 2 frequency signal not to
|
|
* exceed 80ms (there are no individual specs for the operate and release
|
|
* times).
|
|
* Receiver not to release for signal interruptions <=7ms.
|
|
* System malfunction due to signal interruptions >7ms (typically 20ms) is
|
|
* prevented by further logic elements.
|
|
*/
|
|
|
|
#define MF_DURATION (68*8)
|
|
#define MF_PAUSE (68*8)
|
|
#define MF_CYCLE (MF_DURATION + MF_PAUSE)
|
|
|
|
/*!
|
|
MF tone generator descriptor for tests.
|
|
*/
|
|
typedef struct
|
|
{
|
|
float f1; /* First freq */
|
|
float f2; /* Second freq */
|
|
int8_t level1; /* Level of the first freq (dB) */
|
|
int8_t level2; /* Level of the second freq (dB) */
|
|
uint8_t on_time; /* Tone on time (ms) */
|
|
uint8_t off_time; /* Minimum post tone silence (ms) */
|
|
} mf_digit_tones_t;
|
|
|
|
static const mf_digit_tones_t r2_mf_fwd_tones[] =
|
|
{
|
|
{1380.0, 1500.0, -11, -11, 1, 0},
|
|
{1380.0, 1620.0, -11, -11, 1, 0},
|
|
{1500.0, 1620.0, -11, -11, 1, 0},
|
|
{1380.0, 1740.0, -11, -11, 1, 0},
|
|
{1500.0, 1740.0, -11, -11, 1, 0},
|
|
{1620.0, 1740.0, -11, -11, 1, 0},
|
|
{1380.0, 1860.0, -11, -11, 1, 0},
|
|
{1500.0, 1860.0, -11, -11, 1, 0},
|
|
{1620.0, 1860.0, -11, -11, 1, 0},
|
|
{1740.0, 1860.0, -11, -11, 1, 0},
|
|
{1380.0, 1980.0, -11, -11, 1, 0},
|
|
{1500.0, 1980.0, -11, -11, 1, 0},
|
|
{1620.0, 1980.0, -11, -11, 1, 0},
|
|
{1740.0, 1980.0, -11, -11, 1, 0},
|
|
{1860.0, 1980.0, -11, -11, 1, 0},
|
|
{0.0, 0.0, 0, 0, 0, 0}
|
|
};
|
|
|
|
static const mf_digit_tones_t r2_mf_back_tones[] =
|
|
{
|
|
{1140.0, 1020.0, -11, -11, 1, 0},
|
|
{1140.0, 900.0, -11, -11, 1, 0},
|
|
{1020.0, 900.0, -11, -11, 1, 0},
|
|
{1140.0, 780.0, -11, -11, 1, 0},
|
|
{1020.0, 780.0, -11, -11, 1, 0},
|
|
{ 900.0, 780.0, -11, -11, 1, 0},
|
|
{1140.0, 660.0, -11, -11, 1, 0},
|
|
{1020.0, 660.0, -11, -11, 1, 0},
|
|
{ 900.0, 660.0, -11, -11, 1, 0},
|
|
{ 780.0, 660.0, -11, -11, 1, 0},
|
|
{1140.0, 540.0, -11, -11, 1, 0},
|
|
{1020.0, 540.0, -11, -11, 1, 0},
|
|
{ 900.0, 540.0, -11, -11, 1, 0},
|
|
{ 780.0, 540.0, -11, -11, 1, 0},
|
|
{ 660.0, 540.0, -11, -11, 1, 0},
|
|
{0.0, 0.0, 0, 0, 0, 0}
|
|
};
|
|
|
|
static tone_gen_descriptor_t my_mf_digit_tones[16];
|
|
|
|
static char r2_mf_tone_codes[] = "1234567890BCDEF";
|
|
|
|
int callback_ok;
|
|
int callback_roll;
|
|
|
|
static void my_mf_gen_init(float low_fudge,
|
|
int low_level,
|
|
float high_fudge,
|
|
int high_level,
|
|
int duration,
|
|
int fwd)
|
|
{
|
|
const mf_digit_tones_t *tone;
|
|
int i;
|
|
|
|
for (i = 0; i < 15; i++)
|
|
{
|
|
if (fwd)
|
|
tone = &r2_mf_fwd_tones[i];
|
|
else
|
|
tone = &r2_mf_back_tones[i];
|
|
tone_gen_descriptor_init(&my_mf_digit_tones[i],
|
|
tone->f1*(1.0 + low_fudge),
|
|
low_level,
|
|
tone->f2*(1.0 + high_fudge),
|
|
high_level,
|
|
duration,
|
|
0,
|
|
0,
|
|
0,
|
|
false);
|
|
}
|
|
}
|
|
/*- End of function --------------------------------------------------------*/
|
|
|
|
static int my_mf_generate(int16_t amp[], char digit)
|
|
{
|
|
int len;
|
|
char *cp;
|
|
tone_gen_state_t *tone;
|
|
|
|
len = 0;
|
|
if ((cp = strchr(r2_mf_tone_codes, digit)))
|
|
{
|
|
tone = tone_gen_init(NULL, &my_mf_digit_tones[cp - r2_mf_tone_codes]);
|
|
len += tone_gen(tone, amp + len, 9999);
|
|
}
|
|
return len;
|
|
}
|
|
/*- End of function --------------------------------------------------------*/
|
|
|
|
static void codec_munge(int16_t amp[], int len)
|
|
{
|
|
int i;
|
|
uint8_t alaw;
|
|
|
|
for (i = 0; i < len; i++)
|
|
{
|
|
alaw = linear_to_alaw (amp[i]);
|
|
amp[i] = alaw_to_linear (alaw);
|
|
}
|
|
}
|
|
/*- End of function --------------------------------------------------------*/
|
|
|
|
static void digit_delivery(void *data, int digit, int level, int delay)
|
|
{
|
|
char ch;
|
|
|
|
if (data != (void *) 0x12345678)
|
|
{
|
|
callback_ok = false;
|
|
return;
|
|
}
|
|
if ((callback_roll & 1))
|
|
ch = 0;
|
|
else
|
|
ch = r2_mf_tone_codes[callback_roll >> 1];
|
|
if (ch == digit)
|
|
callback_ok = true;
|
|
else
|
|
callback_ok = false;
|
|
if (r2_mf_tone_codes[callback_roll >> 1])
|
|
callback_roll++;
|
|
else
|
|
callback_ok = false;
|
|
}
|
|
/*- End of function --------------------------------------------------------*/
|
|
|
|
static int test_a_tone_set(int fwd)
|
|
{
|
|
int i;
|
|
int j;
|
|
int len;
|
|
int sample;
|
|
const char *s;
|
|
char digit;
|
|
int actual;
|
|
int nplus;
|
|
int nminus;
|
|
float rrb;
|
|
float rcfo;
|
|
int16_t amp[100000];
|
|
r2_mf_rx_state_t *mf_state;
|
|
awgn_state_t *noise_source;
|
|
|
|
mf_state = r2_mf_rx_init(NULL, fwd, NULL, NULL);
|
|
|
|
/* Test 1: Mitel's test 1 isn't really a test. Its a calibration step,
|
|
which has no meaning here. */
|
|
|
|
printf("Test 1: Calibration\n");
|
|
printf(" Passed\n");
|
|
|
|
/* Test 2: Decode check
|
|
This is a sanity check, that all digits are reliably detected
|
|
under ideal conditions. Each possible digit is repeated 10 times,
|
|
with 68ms bursts. The level of each tone is about 6dB down from clip */
|
|
|
|
printf("Test 2: Decode check\n");
|
|
my_mf_gen_init(0.0, -3, 0.0, -3, 68, fwd);
|
|
s = r2_mf_tone_codes;
|
|
while (*s)
|
|
{
|
|
digit = *s++;
|
|
for (i = 0; i < 10; i++)
|
|
{
|
|
len = my_mf_generate(amp, digit);
|
|
codec_munge (amp, len);
|
|
r2_mf_rx(mf_state, amp, len);
|
|
actual = r2_mf_rx_get(mf_state);
|
|
if (actual != digit)
|
|
{
|
|
printf(" Sent '%c'\n", digit);
|
|
printf(" Received 0x%X\n", actual);
|
|
printf(" Failed\n");
|
|
exit(2);
|
|
}
|
|
}
|
|
}
|
|
printf(" Passed\n");
|
|
|
|
/* Test 3: Recognition bandwidth and channel centre frequency check.
|
|
Use all digits. Each digit types requires four tests to complete
|
|
the check. Each section contains 40 pulses of 68ms duration,
|
|
with an amplitude of -20dB from clip per frequency.
|
|
|
|
Four sections covering the tests for one tone (1 digit) are:
|
|
a. H frequency at 0% deviation from center, L frequency at +0.1%.
|
|
L frequency is then increments in +01.% steps up to +4%. The
|
|
number of tone bursts is noted and designated N+.
|
|
b. H frequency at 0% deviation, L frequency at -0.1%. L frequency
|
|
is then incremental in -0.1% steps, up to -4%. The number of
|
|
tone bursts is noted and designated N-.
|
|
c. The test in (a) is repeated with the L frequency at 0% and the
|
|
H frequency varied up to +4%.
|
|
d. The test in (b) is repeated with the L frequency and 0% and the
|
|
H frequency varied to -4%.
|
|
|
|
Receiver Recognition Bandwidth (RRB) is calculated as follows:
|
|
RRB% = (N+ + N-)/10
|
|
Receiver Center Frequency Offset (RCFO) is calculated as follows:
|
|
RCFO% = X + (N+ - N-)/20
|
|
|
|
Note that this test doesn't test what it says it is testing at all,
|
|
and the results are quite inaccurate, if not a downright lie! However,
|
|
it follows the Mitel procedure, so how can it be bad? :)
|
|
|
|
The spec calls for +-4 +-10Hz (ie +-14Hz) of bandwidth. */
|
|
|
|
printf("Test 3: Recognition bandwidth and channel centre frequency check\n");
|
|
s = r2_mf_tone_codes;
|
|
j = 0;
|
|
while (*s)
|
|
{
|
|
digit = *s++;
|
|
for (nplus = 0, i = 1; i <= 60; i++)
|
|
{
|
|
my_mf_gen_init((float) i/1000.0, -17, 0.0, -17, 68, fwd);
|
|
len = my_mf_generate(amp, digit);
|
|
codec_munge(amp, len);
|
|
r2_mf_rx(mf_state, amp, len);
|
|
if (r2_mf_rx_get(mf_state) == digit)
|
|
nplus++;
|
|
}
|
|
for (nminus = 0, i = -1; i >= -60; i--)
|
|
{
|
|
my_mf_gen_init((float) i/1000.0, -17, 0.0, -17, 68, fwd);
|
|
len = my_mf_generate(amp, digit);
|
|
codec_munge(amp, len);
|
|
r2_mf_rx(mf_state, amp, len);
|
|
if (r2_mf_rx_get(mf_state) == digit)
|
|
nminus++;
|
|
}
|
|
rrb = (float) (nplus + nminus)/10.0;
|
|
rcfo = (float) (nplus - nminus)/10.0;
|
|
printf(" %c (low) rrb = %5.2f%%, rcfo = %5.2f%%, max -ve = %5.2f, max +ve = %5.2f\n",
|
|
digit,
|
|
rrb,
|
|
rcfo,
|
|
(float) nminus/10.0,
|
|
(float) nplus/10.0);
|
|
|
|
if (rrb < rcfo + (2.0*100.0*14.0/r2_mf_fwd_tones[j].f1) || rrb >= 15.0 + rcfo)
|
|
{
|
|
printf(" Failed\n");
|
|
exit(2);
|
|
}
|
|
|
|
for (nplus = 0, i = 1; i <= 60; i++)
|
|
{
|
|
my_mf_gen_init(0.0, -17, (float) i/1000.0, -17, 68, fwd);
|
|
len = my_mf_generate(amp, digit);
|
|
codec_munge(amp, len);
|
|
r2_mf_rx(mf_state, amp, len);
|
|
if (r2_mf_rx_get(mf_state) == digit)
|
|
nplus++;
|
|
}
|
|
for (nminus = 0, i = -1; i >= -60; i--)
|
|
{
|
|
my_mf_gen_init(0.0, -17, (float) i/1000.0, -17, 68, fwd);
|
|
len = my_mf_generate(amp, digit);
|
|
codec_munge(amp, len);
|
|
r2_mf_rx(mf_state, amp, len);
|
|
if (r2_mf_rx_get(mf_state) == digit)
|
|
nminus++;
|
|
}
|
|
rrb = (float) (nplus + nminus)/10.0;
|
|
rcfo = (float) (nplus - nminus)/10.0;
|
|
printf(" %c (high) rrb = %5.2f%%, rcfo = %5.2f%%, max -ve = %5.2f, max +ve = %5.2f\n",
|
|
digit,
|
|
rrb,
|
|
rcfo,
|
|
(float) nminus/10.0,
|
|
(float) nplus/10.0);
|
|
if (rrb < rcfo + (2.0*100.0*14.0/r2_mf_fwd_tones[j].f2) || rrb >= 15.0 + rcfo)
|
|
{
|
|
printf(" Failed\n");
|
|
exit(2);
|
|
}
|
|
j++;
|
|
}
|
|
printf(" Passed\n");
|
|
|
|
/* Test 4: Acceptable amplitude ratio (twist).
|
|
Twist all digits in both directions, and check the maximum twist
|
|
we can accept. The way this is done is styled after the Mitel DTMF
|
|
test, and has good and bad points. */
|
|
|
|
printf("Test 4: Acceptable amplitude ratio (twist)\n");
|
|
s = r2_mf_tone_codes;
|
|
while (*s)
|
|
{
|
|
digit = *s++;
|
|
for (nplus = 0, i = -50; i >= -250; i--)
|
|
{
|
|
my_mf_gen_init(0.0, -5, 0.0, i/10, 68, fwd);
|
|
|
|
len = my_mf_generate(amp, digit);
|
|
codec_munge (amp, len);
|
|
r2_mf_rx(mf_state, amp, len);
|
|
if (r2_mf_rx_get(mf_state) == digit)
|
|
nplus++;
|
|
}
|
|
printf(" %c normal twist = %.2fdB\n", digit, (float) nplus/10.0);
|
|
if (nplus < 70)
|
|
{
|
|
printf(" Failed\n");
|
|
exit(2);
|
|
}
|
|
for (nminus = 0, i = -50; i >= -250; i--)
|
|
{
|
|
my_mf_gen_init(0.0, i/10, 0.0, -5, 68, fwd);
|
|
|
|
len = my_mf_generate(amp, digit);
|
|
codec_munge(amp, len);
|
|
r2_mf_rx(mf_state, amp, len);
|
|
if (r2_mf_rx_get(mf_state) == digit)
|
|
nminus++;
|
|
}
|
|
printf(" %c reverse twist = %.2fdB\n", digit, (float) nminus/10.0);
|
|
if (nminus < 70)
|
|
{
|
|
printf(" Failed\n");
|
|
exit(2);
|
|
}
|
|
}
|
|
printf(" Passed\n");
|
|
|
|
/* Test 5: Dynamic range
|
|
This test sends all possible digits, with gradually increasing
|
|
amplitude. We determine the span over which we achieve reliable
|
|
detection. */
|
|
|
|
printf("Test 5: Dynamic range\n");
|
|
for (nplus = nminus = -1000, i = -50; i <= 3; i++)
|
|
{
|
|
s = r2_mf_tone_codes;
|
|
while (*s)
|
|
{
|
|
digit = *s++;
|
|
my_mf_gen_init(0.0, i, 0.0, i, 68, fwd);
|
|
for (j = 0; j < 100; j++)
|
|
{
|
|
len = my_mf_generate(amp, digit);
|
|
codec_munge(amp, len);
|
|
r2_mf_rx(mf_state, amp, len);
|
|
if (r2_mf_rx_get(mf_state) != digit)
|
|
break;
|
|
}
|
|
if (j < 100)
|
|
break;
|
|
}
|
|
if (j == 100)
|
|
{
|
|
if (nplus == -1000)
|
|
nplus = i;
|
|
}
|
|
else
|
|
{
|
|
if (nplus != -1000 && nminus == -1000)
|
|
nminus = i;
|
|
}
|
|
}
|
|
printf(" Dynamic range = %ddB to %ddB\n", nplus, nminus - 1);
|
|
if (nplus > -35 || nminus <= -5)
|
|
{
|
|
printf(" Failed\n");
|
|
exit(2);
|
|
}
|
|
printf(" Passed\n");
|
|
|
|
/* Test 6: Guard time
|
|
This test sends all possible digits, with a gradually reducing
|
|
duration. */
|
|
|
|
printf("Test 6: Guard time\n");
|
|
for (i = 30; i < 62; i++)
|
|
{
|
|
s = r2_mf_tone_codes;
|
|
j = 0;
|
|
while (*s)
|
|
{
|
|
digit = *s++;
|
|
my_mf_gen_init(0.0, -5, 0.0, -3, i, fwd);
|
|
for (j = 0; j < 500; j++)
|
|
{
|
|
len = my_mf_generate(amp, digit);
|
|
codec_munge(amp, len);
|
|
r2_mf_rx(mf_state, amp, len);
|
|
if (r2_mf_rx_get(mf_state) != digit)
|
|
break;
|
|
}
|
|
if (j < 500)
|
|
break;
|
|
}
|
|
if (j == 500)
|
|
break;
|
|
}
|
|
printf(" Guard time = %dms\n", i);
|
|
if (i > 61)
|
|
{
|
|
printf(" Failed\n");
|
|
exit(2);
|
|
}
|
|
printf(" Passed\n");
|
|
|
|
/* Test 7: Acceptable signal to noise ratio
|
|
We send all possible digits at -6dBm from clip, mixed with AWGN.
|
|
We gradually reduce the noise until we get clean detection. */
|
|
|
|
printf("Test 7: Acceptable signal to noise ratio\n");
|
|
my_mf_gen_init(0.0, -3, 0.0, -3, 68, fwd);
|
|
for (i = -3; i > -50; i--)
|
|
{
|
|
s = r2_mf_tone_codes;
|
|
while (*s)
|
|
{
|
|
digit = *s++;
|
|
noise_source = awgn_init_dbm0(NULL, 1234567, (float) i);
|
|
for (j = 0; j < 500; j++)
|
|
{
|
|
len = my_mf_generate(amp, digit);
|
|
for (sample = 0; sample < len; sample++)
|
|
amp[sample] = saturate(amp[sample] + awgn(noise_source));
|
|
codec_munge(amp, len);
|
|
r2_mf_rx(mf_state, amp, len);
|
|
if (r2_mf_rx_get(mf_state) != digit)
|
|
break;
|
|
}
|
|
if (j < 500)
|
|
break;
|
|
}
|
|
if (j == 500)
|
|
break;
|
|
}
|
|
printf(" Acceptable S/N ratio is %ddB\n", -3 - i);
|
|
if (-3 - i > 26)
|
|
{
|
|
printf(" Failed\n");
|
|
exit(2);
|
|
}
|
|
printf(" Passed\n");
|
|
|
|
printf("Test 8: Callback digit delivery mode.\n");
|
|
callback_ok = false;
|
|
callback_roll = 0;
|
|
mf_state = r2_mf_rx_init(NULL, fwd, digit_delivery, (void *) 0x12345678);
|
|
my_mf_gen_init(0.0, -3, 0.0, -3, 68, fwd);
|
|
s = r2_mf_tone_codes;
|
|
noise_source = awgn_init_dbm0(NULL, 1234567, -40.0f);
|
|
while (*s)
|
|
{
|
|
digit = *s++;
|
|
len = my_mf_generate(amp, digit);
|
|
for (sample = 0; sample < len; sample++)
|
|
amp[sample] = saturate(amp[sample] + awgn(noise_source));
|
|
codec_munge(amp, len);
|
|
r2_mf_rx(mf_state, amp, len);
|
|
len = 160;
|
|
memset(amp, '\0', len*sizeof(int16_t));
|
|
for (sample = 0; sample < len; sample++)
|
|
amp[sample] = saturate(amp[sample] + awgn(noise_source));
|
|
codec_munge(amp, len);
|
|
r2_mf_rx(mf_state, amp, len);
|
|
}
|
|
if (!callback_ok)
|
|
{
|
|
printf(" Failed\n");
|
|
exit(2);
|
|
}
|
|
printf(" Passed\n");
|
|
|
|
/* The remainder of the Mitel tape is the talk-off test. This is
|
|
meaningless for R2 MF. However the decoder's tolerance of
|
|
out of band noise is significant. */
|
|
/* TODO: add a OOB tolerance test. */
|
|
|
|
return 0;
|
|
}
|
|
/*- End of function --------------------------------------------------------*/
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
time_t now;
|
|
time_t duration;
|
|
|
|
now = time(NULL);
|
|
printf("R2 forward tones\n");
|
|
test_a_tone_set(true);
|
|
printf("R2 backward tones\n");
|
|
test_a_tone_set(false);
|
|
duration = time(NULL) - now;
|
|
printf("Tests passed in %lds\n", duration);
|
|
return 0;
|
|
}
|
|
/*- End of function --------------------------------------------------------*/
|
|
/*- End of file ------------------------------------------------------------*/
|