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This database includes 12 half-hour ECG recordings and 3 half-hour recordings of noise typical in ambulatory ECG recordings. The noise recordings were made using physically active volunteers and standard ECG recorders, leads, and electrodes; the electrodes were placed on the limbs in positions in which the subjects’ ECGs were not visible. The three noise records were assembled from the recordings by selecting intervals that contained predominantly baseline wander (in record 'bw'), muscle (EMG) artifact (in record 'ma'), and electrode motion artifact (in record 'em'). Electrode motion artifact is generally considered the most troublesome, since it can mimic the appearance of ectopic beats and cannot be removed easily by simple filters, as can noise of other types.
The ECG recordings were created by the script nstdbgen- using two clean recordings (118 and 119) from the MIT-BIH Arrhythmia Database, to which calibrated amounts of noise from record 'em' were added using nst. (The process of making such records is now simpler; the simplified script nstdbgen can be used with current versions of the WFDB software package to recreate these records.) Noise was added beginning after the first 5 minutes of each record, during two-minute segments alternating with two-minute clean segments. The signal-to-noise ratios (SNRs) during the noisy segments of these records are:
Record | SNR (dB) | Record | SNR (dB) |
---|---|---|---|
118e24 | 24 | 119e24 | 24 |
118e18 | 18 | 119e18 | 18 |
118e12 | 12 | 119e12 | 12 |
118e06 | 6 | 119e06 | 6 |
118e00 | 0 | 119e00 | 0 |
118e_6 | -6 | 119e_6 | -6 |
Since the original ECG recordings are clean, the correct beat annotations are known even when the noise makes the recordings visually unreadable. The reference annotations for these records are simply copies of those for the original clean ECGs.
Name Last modified Size Description
Parent Directory - 119e_6.dat 1992-08-02 04:10 2.5M digitized signal(s) 119e00.dat 1992-08-02 04:09 2.5M digitized signal(s) 118e_6.dat 1992-08-02 04:06 2.5M digitized signal(s) 118e00.dat 1992-08-02 04:05 2.5M digitized signal(s) ma.dat 1992-08-02 03:39 1.9M digitized signal(s) em.dat 1992-08-02 03:39 1.9M digitized signal(s) bw.dat 1992-08-02 03:39 1.9M digitized signal(s) 119e24.dat 1992-08-02 04:06 1.9M digitized signal(s) 119e18.dat 1992-08-02 04:07 1.9M digitized signal(s) 119e12.dat 1992-08-02 04:08 1.9M digitized signal(s) 119e06.dat 1992-08-02 04:08 1.9M digitized signal(s) 118e24.dat 1992-08-02 04:03 1.9M digitized signal(s) 118e18.dat 1992-08-02 04:03 1.9M digitized signal(s) 118e12.dat 1992-08-02 04:04 1.9M digitized signal(s) 118e06.dat 1992-08-02 04:04 1.9M digitized signal(s) SHA256SUMS 2007-09-18 12:39 4.9K 119e_6.atr 1992-08-02 04:10 4.7K reference annotations 119e24.atr 1992-08-02 04:06 4.7K reference annotations 119e18.atr 1992-08-02 04:07 4.7K reference annotations 119e12.atr 1992-08-02 04:08 4.7K reference annotations 119e06.atr 1992-08-02 04:08 4.7K reference annotations 119e00.atr 1992-08-02 04:09 4.7K reference annotations 118e_6.atr 1992-08-02 04:06 4.5K reference annotations 118e24.atr 1992-08-02 04:03 4.5K reference annotations 118e18.atr 1992-08-02 04:03 4.5K reference annotations 118e12.atr 1992-08-02 04:04 4.5K reference annotations 118e06.atr 1992-08-02 04:04 4.5K reference annotations 118e00.atr 1992-08-01 23:35 4.5K reference annotations SHA1SUMS 2005-07-13 01:17 3.3K MD5SUMS 2005-07-13 01:17 2.8K nstdb.txt 1992-08-02 04:54 1.9K nstdb.doc 1992-08-02 04:54 1.9K nstdbgen- 1992-08-02 03:39 1.2K nstdbgen 2002-11-08 03:01 730 118e12.hea 1992-08-02 04:04 177 header file 118e24.hea 1992-08-02 04:03 176 header file 119e24.hea 1992-08-02 04:06 175 header file 119e18.hea 1992-08-02 04:07 175 header file 119e06.hea 1992-08-02 04:08 175 header file 118e18.hea 1992-08-02 04:03 175 header file 118e06.hea 1992-08-02 04:04 175 header file 119e12.hea 1992-08-02 04:08 174 header file 118e00.hea 1992-08-02 04:05 173 header file 118e_6.hea 1992-08-02 04:06 172 header file 119e_6.hea 1992-08-02 04:10 171 header file 119e00.hea 1992-08-02 04:09 170 header file bw.hea- 1992-08-02 03:39 117 header file em.hea- 1992-08-02 03:39 116 header file ma.hea- 1992-08-02 03:39 114 header file bw.hea 2012-02-14 18:28 93 header file RECORDS 2000-03-29 10:12 93 list of record names em.hea 2012-02-14 18:28 92 header file 119e_6.xws 1999-12-12 17:29 91 WAVEScript 119e24.xws 1999-12-12 17:29 91 WAVEScript 119e18.xws 1999-12-12 17:29 91 WAVEScript 119e12.xws 1999-12-12 17:29 91 WAVEScript 119e06.xws 1999-12-12 17:29 91 WAVEScript 119e00.xws 1999-12-12 17:29 91 WAVEScript 118e_6.xws 1999-12-12 17:29 91 WAVEScript 118e24.xws 1999-12-12 17:29 91 WAVEScript 118e18.xws 1999-12-12 17:29 91 WAVEScript 118e12.xws 1999-12-12 17:29 91 WAVEScript 118e06.xws 1999-12-12 17:29 91 WAVEScript 118e00.xws 1999-12-12 17:29 91 WAVEScript ma.hea 2012-02-14 18:28 90 header file ma.xws 1999-12-12 17:29 80 WAVEScript em.xws 1999-12-12 17:29 80 WAVEScript bw.xws 1999-12-12 17:29 80 WAVEScript ANNOTATORS 2000-10-13 22:32 59 list of annotators DOI 2015-09-21 13:00 19 old/ 2011-07-14 10:50 -
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