Mercurial > hg > audiostuff
comparison spandsp-0.0.3/spandsp-0.0.3/tests/dc_restore_tests.c @ 5:f762bf195c4b
import spandsp-0.0.3
| author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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| date | Fri, 25 Jun 2010 16:00:21 +0200 |
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| 4:26cd8f1ef0b1 | 5:f762bf195c4b |
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| 1 /* | |
| 2 * SpanDSP - a series of DSP components for telephony | |
| 3 * | |
| 4 * dc_restore_tests.c - Tests for the dc_restore functions. | |
| 5 * | |
| 6 * Written by Steve Underwood <steveu@coppice.org> | |
| 7 * | |
| 8 * Copyright (C) 2001 Steve Underwood | |
| 9 * | |
| 10 * All rights reserved. | |
| 11 * | |
| 12 * This program is free software; you can redistribute it and/or modify | |
| 13 * it under the terms of the GNU General Public License version 2, as | |
| 14 * published by the Free Software Foundation. | |
| 15 * | |
| 16 * This program is distributed in the hope that it will be useful, | |
| 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 19 * GNU General Public License for more details. | |
| 20 * | |
| 21 * You should have received a copy of the GNU General Public License | |
| 22 * along with this program; if not, write to the Free Software | |
| 23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
| 24 * | |
| 25 * $Id: dc_restore_tests.c,v 1.18 2006/11/19 14:07:26 steveu Exp $ | |
| 26 */ | |
| 27 | |
| 28 /*! \page dc_restore_tests_page DC restoration tests | |
| 29 \section dc_restore_tests_page_sec_1 What does it do? | |
| 30 */ | |
| 31 | |
| 32 #ifdef HAVE_CONFIG_H | |
| 33 #include "config.h" | |
| 34 #endif | |
| 35 | |
| 36 #include <stdlib.h> | |
| 37 #include <inttypes.h> | |
| 38 #include <stdio.h> | |
| 39 #include <memory.h> | |
| 40 #if defined(HAVE_TGMATH_H) | |
| 41 #include <tgmath.h> | |
| 42 #endif | |
| 43 #if defined(HAVE_MATH_H) | |
| 44 #include <math.h> | |
| 45 #endif | |
| 46 #include <time.h> | |
| 47 #include <tiffio.h> | |
| 48 | |
| 49 #include "spandsp.h" | |
| 50 | |
| 51 int main (int argc, char *argv[]) | |
| 52 { | |
| 53 awgn_state_t noise_source; | |
| 54 dc_restore_state_t dc_state; | |
| 55 int i; | |
| 56 int idum = 1234567; | |
| 57 int16_t dirty; | |
| 58 int16_t clean; | |
| 59 int estimate; | |
| 60 int min; | |
| 61 int max; | |
| 62 int dc_offset; | |
| 63 | |
| 64 dc_offset = 5000; | |
| 65 awgn_init_dbm0(&noise_source, idum, -10.0); | |
| 66 dc_restore_init(&dc_state); | |
| 67 for (i = 0; i < 100000; i++) | |
| 68 { | |
| 69 dirty = awgn(&noise_source) + dc_offset; | |
| 70 clean = dc_restore(&dc_state, dirty); | |
| 71 if ((i % 1000) == 0) | |
| 72 { | |
| 73 printf("Sample %6d: %d (expect %d)\n", | |
| 74 i, | |
| 75 dc_restore_estimate(&dc_state), | |
| 76 dc_offset); | |
| 77 } | |
| 78 } | |
| 79 /* We should have settled by now. Look at the variation we get */ | |
| 80 min = 99999; | |
| 81 max = -99999; | |
| 82 for (i = 0; i < 100000; i++) | |
| 83 { | |
| 84 dirty = awgn(&noise_source) + dc_offset; | |
| 85 clean = dc_restore(&dc_state, dirty); | |
| 86 estimate = dc_restore_estimate(&dc_state); | |
| 87 if (estimate < min) | |
| 88 min = estimate; | |
| 89 if (estimate > max) | |
| 90 max = estimate; | |
| 91 } | |
| 92 printf("Spread of DC estimate for an offset of %d was %d to %d\n", dc_offset, min, max); | |
| 93 if (min < dc_offset - 50 || max > dc_offset + 50) | |
| 94 { | |
| 95 printf("Test failed.\n"); | |
| 96 exit(2); | |
| 97 } | |
| 98 printf("Test passed.\n"); | |
| 99 return 0; | |
| 100 } | |
| 101 /*- End of function --------------------------------------------------------*/ | |
| 102 /*- End of file ------------------------------------------------------------*/ |