forked from Mirrors/freeswitch
551 lines
18 KiB
C
551 lines
18 KiB
C
/*
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* SpanDSP - a series of DSP components for telephony
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*
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* bell_mf_tests.c - Test the Bell MF detector against the spec., whatever the
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* spec. may be :)
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*
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* Written by Steve Underwood <steveu@coppice.org>
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*
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* Copyright (C) 2003 Steve Underwood
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*! \file */
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/*! \page bell_mf_tests_page Bell MF tone generation and detection tests
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\section bell_mf_tests_page_sec_1 What does it do?
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These tests are fashioned after those on the CM7291 test tape from
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Mitel. Those tests are for DTMF, rather than Bell MF, but make a
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fair starting point for a set of meaningful tests of Bell MF.
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These tests include conversion to and from A-law. It is assumed the
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distortion this produces is comparable to u-law, so it should be
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a fair test of performance in a real PSTN channel.
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*/
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#if defined(HAVE_CONFIG_H)
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#include "config.h"
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <string.h>
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#include <time.h>
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#include <sndfile.h>
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#define SPANDSP_EXPOSE_INTERNAL_STRUCTURES
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#include "spandsp.h"
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/* Basic Bell MF specs:
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*
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* Signal generation:
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* Tone on time = KP: 100+-7ms. All other signals: 68+-7ms
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* Tone off time (between digits) = 68+-7ms
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* Frequency tolerance +- 1.5%
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* Signal level -7+-1dBm per frequency
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*
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* Signal reception:
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* Frequency tolerance +- 1.5% +-10Hz
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* Signal level -14dBm to 0dBm
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* Perform a "two and only two tones present" test.
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* Twist <= 6dB accepted
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* Receiver sensitive to signals above -22dBm per frequency
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* Test for a minimum of 55ms if KP, or 30ms of other signals.
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* Signals to be recognised if the two tones arrive within 8ms of each other.
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* Invalid signals result in the return of the re-order tone.
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*/
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#define MF_DURATION (68*8)
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#define MF_PAUSE (68*8)
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#define MF_CYCLE (MF_DURATION + MF_PAUSE)
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/*!
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MF tone descriptor for tests.
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*/
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typedef struct
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{
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float f1; /* First freq */
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float f2; /* Second freq */
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int8_t level1; /* Level of the first freq (dB) */
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int8_t level2; /* Level of the second freq (dB) */
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uint8_t on_time; /* Tone on time (ms) */
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uint8_t off_time; /* Minimum post tone silence (ms) */
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} mf_digit_tones_t;
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static const mf_digit_tones_t bell_mf_tones[] =
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{
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{ 700.0, 900.0, -7, -7, 68, 68},
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{ 700.0, 1100.0, -7, -7, 68, 68},
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{ 900.0, 1100.0, -7, -7, 68, 68},
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{ 700.0, 1300.0, -7, -7, 68, 68},
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{ 900.0, 1300.0, -7, -7, 68, 68},
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{1100.0, 1300.0, -7, -7, 68, 68},
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{ 700.0, 1500.0, -7, -7, 68, 68},
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{ 900.0, 1500.0, -7, -7, 68, 68},
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{1100.0, 1500.0, -7, -7, 68, 68},
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{1300.0, 1500.0, -7, -7, 68, 68},
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{ 700.0, 1700.0, -7, -7, 68, 68}, /* ST''' - use 'C' */
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{ 900.0, 1700.0, -7, -7, 68, 68}, /* ST' - use 'A' */
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{1100.0, 1700.0, -7, -7, 100, 68}, /* KP - use '*' */
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{1300.0, 1700.0, -7, -7, 68, 68}, /* ST'' - use 'B' */
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{1500.0, 1700.0, -7, -7, 68, 68}, /* ST - use '#' */
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{0.0, 0.0, 0, 0, 0, 0}
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};
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static tone_gen_descriptor_t my_mf_digit_tones[16];
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static char bell_mf_tone_codes[] = "1234567890CA*B#";
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bool callback_ok;
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int callback_roll;
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static void my_mf_gen_init(float low_fudge,
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int low_level,
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float high_fudge,
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int high_level,
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int duration,
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int gap)
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{
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int i;
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/* The fiddle factor on the tone duration is to make KP consistently
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50% longer than the other digits, as the digit durations are varied
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for the tests. This is an approximation, as the real scaling should
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be 100/68 */
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for (i = 0; i < 15; i++)
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{
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tone_gen_descriptor_init(&my_mf_digit_tones[i],
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bell_mf_tones[i].f1*(1.0 + low_fudge),
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low_level,
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bell_mf_tones[i].f2*(1.0 + high_fudge),
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high_level,
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(i == 12) ? 3*duration/2 : duration,
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gap,
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0,
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0,
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false);
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}
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}
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/*- End of function --------------------------------------------------------*/
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static int my_mf_generate(int16_t amp[], const char *digits)
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{
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int len;
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char *cp;
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tone_gen_state_t tone;
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len = 0;
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while (*digits)
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{
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if ((cp = strchr(bell_mf_tone_codes, *digits)))
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{
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tone_gen_init(&tone, &my_mf_digit_tones[cp - bell_mf_tone_codes]);
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len += tone_gen(&tone, amp + len, 9999);
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}
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digits++;
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}
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return len;
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}
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/*- End of function --------------------------------------------------------*/
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static void codec_munge(int16_t amp[], int len)
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{
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int i;
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uint8_t alaw;
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for (i = 0; i < len; i++)
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{
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alaw = linear_to_alaw (amp[i]);
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amp[i] = alaw_to_linear (alaw);
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}
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}
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/*- End of function --------------------------------------------------------*/
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#define ALL_POSSIBLE_DIGITS "1234567890CA*B#"
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static void digit_delivery(void *data, const char *digits, int len)
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{
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int i;
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int seg;
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const char *s = ALL_POSSIBLE_DIGITS;
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const char *t;
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if (data != (void *) 0x12345678)
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{
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callback_ok = false;
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return;
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}
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callback_ok = true;
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t = s + callback_roll;
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seg = 15 - callback_roll;
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for (i = 0; i < len; i += seg, seg = 15)
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{
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if (i + seg > len)
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seg = len - i;
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if (memcmp(digits + i, t, seg))
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{
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callback_ok = false;
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printf("Fail at %d %d\n", i, seg);
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break;
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}
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t = s;
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callback_roll = (callback_roll + seg)%15;
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}
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}
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/*- End of function --------------------------------------------------------*/
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static int16_t amp[1000000];
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int main(int argc, char *argv[])
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{
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int duration;
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int i;
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int j;
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int len;
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int sample;
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const char *s;
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char digit[2];
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char buf[MAX_BELL_MF_DIGITS + 1];
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int actual;
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int nplus;
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int nminus;
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float rrb;
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float rcfo;
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time_t now;
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bell_mf_rx_state_t *mf_state;
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awgn_state_t noise_source;
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time(&now);
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mf_state = bell_mf_rx_init(NULL, NULL, NULL);
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/* Test 1: Mitel's test 1 isn't really a test. Its a calibration step,
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which has no meaning here. */
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printf("Test 1: Calibration\n");
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printf(" Passed\n");
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/* Test 2: Decode check
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This is a sanity check, that all digits are reliably detected
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under ideal conditions. Each possible digit is repeated 10 times,
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with 68ms bursts. The level of each tone is about 6dB down from clip */
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printf("Test 2: Decode check\n");
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my_mf_gen_init(0.0, -3, 0.0, -3, 68, 68);
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s = ALL_POSSIBLE_DIGITS;
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digit[1] = '\0';
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while (*s)
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{
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digit[0] = *s++;
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for (i = 0; i < 10; i++)
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{
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len = my_mf_generate(amp, digit);
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codec_munge(amp, len);
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bell_mf_rx(mf_state, amp, len);
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actual = bell_mf_rx_get(mf_state, buf, 128);
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if (actual != 1 || buf[0] != digit[0])
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{
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printf(" Sent '%s'\n", digit);
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printf(" Received '%s' [%d]\n", buf, actual);
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printf(" Failed\n");
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exit(2);
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}
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}
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}
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printf(" Passed\n");
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/* Test 3: Recognition bandwidth and channel centre frequency check.
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Use all digits. Each digit types requires four tests to complete
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the check. Each section contains 40 pulses of 68ms duration,
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with an amplitude of -20dB from clip per frequency.
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Four sections covering the tests for one tone (1 digit) are:
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a. H frequency at 0% deviation from center, L frequency at +0.1%.
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L frequency is then increments in +01.% steps up to +4%. The
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number of tone bursts is noted and designated N+.
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b. H frequency at 0% deviation, L frequency at -0.1%. L frequency
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is then incremental in -0.1% steps, up to -4%. The number of
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tone bursts is noted and designated N-.
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c. The test in (a) is repeated with the L frequency at 0% and the
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H frequency varied up to +4%.
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d. The test in (b) is repeated with the L frequency and 0% and the
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H frequency varied to -4%.
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Receiver Recognition Bandwidth (RRB) is calculated as follows:
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RRB% = (N+ + N-)/10
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Receiver Center Frequency Offset (RCFO) is calculated as follows:
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RCFO% = X + (N+ - N-)/20
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Note that this test doesn't test what it says it is testing at all,
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and the results are quite inaccurate, if not a downright lie! However,
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it follows the Mitel procedure, so how can it be bad? :)
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The spec calls for +-1.5% +-10Hz of bandwidth.
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*/
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printf("Test 3: Recognition bandwidth and channel centre frequency check\n");
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s = ALL_POSSIBLE_DIGITS;
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digit[1] = '\0';
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j = 0;
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while (*s)
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{
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digit[0] = *s++;
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for (nplus = 0, i = 1; i <= 60; i++)
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{
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my_mf_gen_init((float) i/1000.0, -17, 0.0, -17, 68, 68);
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len = my_mf_generate(amp, digit);
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codec_munge(amp, len);
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bell_mf_rx(mf_state, amp, len);
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nplus += bell_mf_rx_get(mf_state, buf, 128);
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}
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for (nminus = 0, i = -1; i >= -60; i--)
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{
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my_mf_gen_init((float) i/1000.0, -17, 0.0, -17, 68, 68);
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len = my_mf_generate(amp, digit);
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codec_munge(amp, len);
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bell_mf_rx(mf_state, amp, len);
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nminus += bell_mf_rx_get(mf_state, buf, 128);
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}
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rrb = (float) (nplus + nminus)/10.0;
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rcfo = (float) (nplus - nminus)/10.0;
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printf(" %c (low) rrb = %5.2f%%, rcfo = %5.2f%%, max -ve = %5.2f, max +ve = %5.2f\n",
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digit[0],
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rrb,
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rcfo,
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(float) nminus/10.0,
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(float) nplus/10.0);
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if (rrb < 3.0 + rcfo + (2.0*100.0*10.0/bell_mf_tones[j].f1) || rrb >= 15.0 + rcfo)
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{
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printf(" Failed\n");
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exit(2);
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}
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for (nplus = 0, i = 1; i <= 60; i++)
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{
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my_mf_gen_init(0.0, -17, (float) i/1000.0, -17, 68, 68);
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len = my_mf_generate(amp, digit);
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codec_munge(amp, len);
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bell_mf_rx(mf_state, amp, len);
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nplus += bell_mf_rx_get(mf_state, buf, 128);
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}
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for (nminus = 0, i = -1; i >= -60; i--)
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{
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my_mf_gen_init(0.0, -17, (float) i/1000.0, -17, 68, 68);
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len = my_mf_generate(amp, digit);
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codec_munge(amp, len);
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bell_mf_rx(mf_state, amp, len);
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nminus += bell_mf_rx_get(mf_state, buf, 128);
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}
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rrb = (float) (nplus + nminus)/10.0;
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rcfo = (float) (nplus - nminus)/10.0;
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printf(" %c (high) rrb = %5.2f%%, rcfo = %5.2f%%, max -ve = %5.2f, max +ve = %5.2f\n",
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digit[0],
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rrb,
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rcfo,
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(float) nminus/10.0,
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(float) nplus/10.0);
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if (rrb < 3.0 + rcfo + (2.0*100.0*10.0/bell_mf_tones[j].f2) || rrb >= 15.0 + rcfo)
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{
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printf(" Failed\n");
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exit(2);
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}
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j++;
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}
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printf(" Passed\n");
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/* Test 4: Acceptable amplitude ratio (twist).
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Twist all digits in both directions, and check the maximum twist
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we can accept. The way this is done is styled after the Mitel DTMF
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test, and has good and bad points. */
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printf("Test 4: Acceptable amplitude ratio (twist)\n");
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s = ALL_POSSIBLE_DIGITS;
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digit[1] = '\0';
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while (*s)
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{
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digit[0] = *s++;
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for (nplus = 0, i = -50; i >= -250; i--)
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{
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my_mf_gen_init(0.0, -5, 0.0, i/10, 68, 68);
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len = my_mf_generate(amp, digit);
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codec_munge(amp, len);
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bell_mf_rx(mf_state, amp, len);
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nplus += bell_mf_rx_get(mf_state, buf, 128);
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}
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printf(" %c normal twist = %.2fdB\n", digit[0], (float) nplus/10.0);
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if (nplus < 60)
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{
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printf(" Failed\n");
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exit(2);
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}
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for (nminus = 0, i = -50; i >= -250; i--)
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{
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my_mf_gen_init(0.0, i/10, 0.0, -5, 68, 68);
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len = my_mf_generate(amp, digit);
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codec_munge(amp, len);
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bell_mf_rx(mf_state, amp, len);
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nminus += bell_mf_rx_get(mf_state, buf, 128);
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}
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printf(" %c reverse twist = %.2fdB\n", digit[0], (float) nminus/10.0);
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if (nminus < 60)
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{
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printf(" Failed\n");
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exit(2);
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}
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}
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printf(" Passed\n");
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/* Test 5: Dynamic range
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This test sends all possible digits, with gradually increasing
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amplitude. We determine the span over which we achieve reliable
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detection. The spec says we should detect between -14dBm and 0dBm,
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but the tones clip above -3dBm, so this cannot really work. */
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printf("Test 5: Dynamic range\n");
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for (nplus = nminus = -1000, i = -50; i <= 3; i++)
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{
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my_mf_gen_init(0.0, i, 0.0, i, 68, 68);
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for (j = 0; j < 100; j++)
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{
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len = my_mf_generate(amp, ALL_POSSIBLE_DIGITS);
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codec_munge(amp, len);
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bell_mf_rx(mf_state, amp, len);
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if (bell_mf_rx_get(mf_state, buf, 128) != 15)
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break;
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if (strcmp(buf, ALL_POSSIBLE_DIGITS) != 0)
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break;
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}
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if (j == 100)
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{
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if (nplus == -1000)
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nplus = i;
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}
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else
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{
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if (nplus != -1000 && nminus == -1000)
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nminus = i;
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}
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}
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printf(" Dynamic range = %ddB to %ddB\n", nplus, nminus - 1);
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if (nplus > -22 || nminus <= -3)
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{
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printf(" Failed\n");
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exit(2);
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}
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printf(" Passed\n");
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/* Test 6: Guard time
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This test sends all possible digits, with a gradually reducing
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duration. The spec defines a narrow range of tone duration
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times we can expect, so as long as we detect reliably at the
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specified minimum we should be OK. However, the spec also says
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we should detect on a minimum of 55ms of KP, or 30ms of other
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digits. */
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printf("Test 6: Guard time\n");
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for (i = 30; i < 62; i++)
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{
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my_mf_gen_init(0.0, -5, 0.0, -3, i, 68);
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for (j = 0; j < 500; j++)
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{
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len = my_mf_generate(amp, ALL_POSSIBLE_DIGITS);
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codec_munge(amp, len);
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bell_mf_rx(mf_state, amp, len);
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if (bell_mf_rx_get(mf_state, buf, 128) != 15)
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break;
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if (strcmp(buf, ALL_POSSIBLE_DIGITS) != 0)
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break;
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}
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if (j == 500)
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break;
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}
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printf(" Guard time = %dms\n", i);
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if (i > 61)
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{
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printf(" Failed\n");
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exit(2);
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}
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printf(" Passed\n");
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|
/* Test 7: Acceptable signal to noise ratio
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|
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, 68);
|
|
for (i = -10; i > -50; i--)
|
|
{
|
|
awgn_init_dbm0(&noise_source, 1234567, (float) i);
|
|
for (j = 0; j < 500; j++)
|
|
{
|
|
len = my_mf_generate(amp, ALL_POSSIBLE_DIGITS);
|
|
for (sample = 0; sample < len; sample++)
|
|
amp[sample] = saturate(amp[sample] + awgn(&noise_source));
|
|
codec_munge(amp, len);
|
|
bell_mf_rx(mf_state, amp, len);
|
|
if (bell_mf_rx_get(mf_state, buf, 128) != 15)
|
|
break;
|
|
if (strcmp(buf, ALL_POSSIBLE_DIGITS) != 0)
|
|
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");
|
|
|
|
/* The remainder of the Mitel tape is the talk-off test. This is
|
|
meaningless for Bell MF. However the decoder's tolerance of
|
|
out of band noise is significant. */
|
|
/* TODO: add a OOB tolerance test. */
|
|
|
|
/* Test the callback mode for delivering detected digits */
|
|
|
|
printf("Test: Callback digit delivery mode.\n");
|
|
callback_ok = false;
|
|
callback_roll = 0;
|
|
mf_state = bell_mf_rx_init(NULL, digit_delivery, (void *) 0x12345678);
|
|
my_mf_gen_init(0.0, -10, 0.0, -10, 68, 68);
|
|
for (i = 1; i < 10; i++)
|
|
{
|
|
len = 0;
|
|
for (j = 0; j < i; j++)
|
|
len += my_mf_generate(amp + len, ALL_POSSIBLE_DIGITS);
|
|
bell_mf_rx(mf_state, amp, len);
|
|
if (!callback_ok)
|
|
break;
|
|
}
|
|
if (!callback_ok)
|
|
{
|
|
printf(" Failed\n");
|
|
exit(2);
|
|
}
|
|
printf(" Passed\n");
|
|
|
|
duration = time (NULL) - now;
|
|
printf("Tests passed in %ds\n", duration);
|
|
return 0;
|
|
}
|
|
/*- End of function --------------------------------------------------------*/
|
|
/*- End of file ------------------------------------------------------------*/
|