--- a
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+file: nstdb.doc		G. Moody	August 1992
+
+Copyright (C) Massachusetts Institute of Technology 1992.  All rights reserved.
+
+
+This directory contains the second edition of the MIT-BIH Noise Stress Test
+Database.  The directory includes noise records (`bw', `em', and `ma') that may
+be added to ECG records by `nst' to create noise stress test records.  It also
+contains 12 sample noise stress test records generated by `nst', by adding `em'
+noise to MIT-BIH Arrhythmia Database records 118 and 119.  File `nstdbgen' is
+the UNIX shell script that was used to generate the sample records.  For
+convenience, reference annotation files are included here; all are copies of
+the original reference annotation files for records 118 and 119.  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
+
+The records with SNRs of 0 and -6 dB are written in format 16, since the sample
+values occasionally exceed the 12-bit range enforced by format 212 (used for
+the other records in this directory).
+
+The directory `old' contains the first edition of the MIT-BIH Noise Stress Test
+Database, reproduced here for the sake of completeness.  Unless you wish to
+repeat an experiment based on the first edition, use the records in this
+directory.
+
+For further information about:		see:
+
+ these records				`../readme.doc'
+
+ signal-to-noise ratio,			the ECG Database Applications Guide,
+  and `nst'				  or `../src/db/doc/nst.1'
+
+ testing noise tolerance of		the ECG Database Applications Guide
+  arrhythmia detectors		 	 or `../src/db/doc/eval.tex'
+
+ signal file formats			the ECG Database Applications Guide
+					  or `../src/db/doc/signal.5'
+
+ the first edition of			`old/oldnstdb.doc'
+  this database
+