forked from Mirrors/freeswitch
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/*
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* SpanDSP - a series of DSP components for telephony
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*
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* dc_restore_tests.c - Tests for the dc_restore functions.
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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) 2001 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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/*! \page dc_restore_tests_page DC restoration tests
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\section dc_restore_tests_page_sec_1 What does it do?
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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 <memory.h>
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#include <time.h>
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//#if defined(WITH_SPANDSP_INTERNALS)
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#define SPANDSP_EXPOSE_INTERNAL_STRUCTURES
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//#endif
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#include "spandsp.h"
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int main (int argc, char *argv[])
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{
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awgn_state_t noise_source;
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dc_restore_state_t dc_state;
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int i;
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int idum = 1234567;
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int16_t dirty;
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int16_t clean;
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int estimate;
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int min;
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int max;
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int dc_offset;
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dc_offset = 5000;
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awgn_init_dbm0(&noise_source, idum, -10.0);
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dc_restore_init(&dc_state);
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for (i = 0; i < 100000; i++)
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{
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dirty = awgn(&noise_source) + dc_offset;
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clean = dc_restore(&dc_state, dirty);
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if ((i % 1000) == 0)
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{
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printf("Sample %6d: %d (expect %d)\n",
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i,
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dc_restore_estimate(&dc_state),
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dc_offset);
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}
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}
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/* We should have settled by now. Look at the variation we get */
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min = 99999;
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max = -99999;
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for (i = 0; i < 100000; i++)
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{
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dirty = awgn(&noise_source) + dc_offset;
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clean = dc_restore(&dc_state, dirty);
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estimate = dc_restore_estimate(&dc_state);
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if (estimate < min)
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min = estimate;
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if (estimate > max)
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max = estimate;
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}
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printf("Spread of DC estimate for an offset of %d was %d to %d\n", dc_offset, min, max);
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if (min < dc_offset - 50 || max > dc_offset + 50)
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{
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printf("Test failed.\n");
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exit(2);
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}
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printf("Test passed.\n");
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return 0;
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}
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/*- End of function --------------------------------------------------------*/
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/*- End of file ------------------------------------------------------------*/
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