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<H1 ALIGN=CENTER>WFDB Applications Guide</H1>
<P ALIGN=CENTER><STRONG>Tenth Edition<BR>
(Revised for release 10.2.6)<BR>
1 June 2002<BR>
<BR> 
<BR> 
<BR> 
George B. Moody<BR> 
Harvard-MIT Division of Health Sciences and Technology</STRONG></P><P>
<P>
Copyright &#169;1980-2002 George B. Moody
<P>
The most recent versions of the programs described in this guide may be freely
downloaded from <A HREF="http://www.physionet.org/">PhysioNet</A>.  For
further information, write to:
<P>
<BLOCKQUOTE>George B. Moody<BR> 
MIT Room E25-505A<BR> 
Cambridge, MA 02139<BR> 
USA<BR> 
</BLOCKQUOTE>
<P>
<A HREF="wag.ps">PostScript</A> and <A HREF="wag.pdf">PDF</A> versions of this
guide are available.  The latest version can be downloaded from
<A HREF="http://www.physionet.org/">PhysioNet</A>.
<P>
Permission is granted to make and distribute verbatim copies of this
guide provided that the copyright notice and this permission notice are
preserved on all copies.
<P>
Permission is granted to copy and distribute modified versions of this
guide under the conditions for verbatim copying, provided also that the
entire resulting derived work is distributed under the terms of a
permission notice identical to this one.
<P>
Permission is granted to copy and distribute translations of this guide
into another language, under the above conditions for modified versions.
<P>
<BR> <HR>
<H2>Contents</H2>
<A HREF="intro.htm"><H3>Introduction</H3></A>
<H3>Applications</H3>
<UL> 
<LI> <A HREF="a2m-1.htm">a2m, ad2m, m2a, md2a</A>: utilities for converting
	between MIT and AHA DB formats
<LI> <A HREF="ann2rr-1.htm">ann2rr, rr2ann</A>: convert annotation files to
	interval lists and vice versa
<LI> <A HREF="bxb-1.htm">bxb</A>: ANSI/AAMI-standard beat-by-beat annotation
	comparator
<LI> <A HREF="calsig-1.htm">calsig</A>: calibrate signals of a WFDB record
<LI> <A HREF="cohere-1.htm">coherence</A>: estimate coherence and
	cross-spectrum of two time series
<LI> <A HREF="dfa-1.htm">dfa</A>: detrended fluctuation analysis
<LI> <A HREF="ecgeva-1.htm">ecgeval</A>: generate and run ECG analyzer
	evaluation script
<LI> <A HREF="epic-1.htm">epic</A>: ANSI/AAMI-standard episode-by-episode
	annotation comparator
<LI> <A HREF="fft-1.htm">fft</A>: fast Fourier transform
<LI> <A HREF="fir-1.htm">fir</A>: general-purpose FIR filter for WFDB records
<LI> <A HREF="hrfft-1.htm">hrfft, hrlomb, hrmem, hrplot</A>: calculate and
	plot heart rate power spectra
<LI> <A HREF="ihr-1.htm">ihr</A>: calculate instantaneous heart rate
<LI> <A HREF="log10-1.htm">log10</A>: calculate common logarithms of
	two-column data
<LI> <A HREF="lomb-1.htm">lomb</A>: estimate power spectrum using the Lomb
	periodogram method
<LI> <A HREF="memse-1.htm">memse</A>: estimate power spectrum using the
	maximum entropy (all poles) method
<LI> <A HREF="mfilt-1.htm">mfilt</A>: general-purpose median filter for WFDB
	records
<LI> <A HREF="mrgann-1.htm">mrgann</A>: merge annotation files
<LI> <A HREF="mxm-1.htm">mxm</A>: ANSI/AAMI-standard
	measurement-by-measurement comparator
<LI> <A HREF="nst-1.htm">nst</A>: noise stress test for ECG analysis programs
<LI> <A HREF="plot2d-1.htm">plot2d, plot3d</A>: make 2-D or 3-D plots from
	text files of data, using <I>gnuplot</I>
<LI> <A HREF="plotst-1.htm">plotstm</A>: produce scatter plot of ST measurement
	errors on a PostScript device
<LI> <A HREF="pschar-1.htm">pschart</A>: produce annotated `chart recordings'
	on a PostScript device
<LI> <A HREF="psfd-1.htm">psfd</A>: produce annotated `full disclosure' plots
	on a PostScript device
<LI> <A HREF="rdann-1.htm">rdann</A>: read a WFDB annotation file
<LI> <A HREF="rdsamp-1.htm">rdsamp</A>: read WFDB signal files
<LI> <A HREF="rxr-1.htm">rxr</A>: ANSI/AAMI-standard run-by-run annotation
	comparator
<LI> <A HREF="sampfr-1.htm">sampfreq</A>: show sampling frequency for a record
<LI> <A HREF="sample-1.htm">sample</A>: digitize and replay analog signals
	(MS-DOS only)
<LI> <A HREF="setwfd-1.htm">setwfdb, cshsetwfdb</A>: set WFDB environment
	variables
<LI> <A HREF="sigamp-1.htm">sigamp</A>: measure signal amplitudes of a WFDB
	record
<LI> <A HREF="skewed-1.htm">skewedit</A>: edit skew fields of header file(s)
<LI> <A HREF="snip-1.htm">snip</A>: copy an excerpt of a WFDB record
<LI> <A HREF="sortan-1.htm">sortann</A>: rearrange annotations in canonical
	order
<LI> <A HREF="sqrs-1.htm">sqrs, sqrs125</A>: single-channel QRS detector
<LI> <A HREF="sumann-1.htm">sumann</A>: summarize the contents of a WFDB
	annotation file
<LI> <A HREF="sumsta-1.htm">sumstats</A>: derive aggregate statistics from
	bxb, rxr, etc., line-format output
<LI> <A HREF="tach-1.htm">tach</A>: heart rate tachometer
<LI> <A HREF="view-1.htm">view, vsetup</A>: WFDB browser for MS-DOS
<LI> <A HREF="wave-1.htm">wave</A>: waveform analyzer, viewer, and editor for
	the X Window System
<LI> <A HREF="wfdbca-1.htm">wfdbcat</A>: copy WFDB files to standard output
<LI> <A HREF="wfdbco-1.htm">wfdbcollate</A>: collate WFDB records into a
	multi-segment record
<LI> <A HREF="wfdb-c-1.htm">wfdb-config</A>: print WFDB library info
<LI> <A HREF="wfdbde-1.htm">wfdbdesc</A>: read signal specifications
<LI> <A HREF="wfdbwh-1.htm">wfdbwhich</A>: find a WFDB file and print its
        pathname
<LI> <A HREF="wrann-1.htm">wrann</A>: write a WFDB annotation file
<LI> <A HREF="wrsamp-1.htm">wrsamp</A>: write WFDB signal files
<LI> <A HREF="wview-1.htm">wview</A>: WFDB browser for MS Windows
<LI> <A HREF="xform-1.htm">xform</A>: sampling frequency, amplitude, and
	format conversion for WFDB records
</UL>
<H3>Functions</H3>
<UL>
<LI> <A HREF="wfdb-3.htm">wfdb</A>: Waveform Database library
<LI> <A HREF="wfdbf-3.htm">wfdbf</A>: Waveform Database library bindings for
	Fortran
</UL>
<H3>File formats</H3>
<UL>
<LI> <A HREF="annot-5.htm">annot</A>: WFDB annotation file format
<LI> <A HREF="header-5.htm">header</A>: WFDB header file format
<LI> <A HREF="signal-5.htm">signal</A>: WFDB signal file format
<LI> <A HREF="wfdbca-5.htm">wfdbcal</A>: WFDB calibration file format
</UL>
<H3>Appendices</H3>
<UL>
<LI><I><A HREF="install.htm">Installing the WFDB Software Package</A></I>
<LI><I><A HREF="eval.htm">Evaluating ECG Analyzers</A></I>
</UL>
<BR><HR>
<H2>Other links of interest</H2>
<UL>
<LI><A HREF="http://www.physionet.org/">PhysioNet</A><BR>
PhysioNet offers free access via the web to large collections of
recorded physiologic signals and related open-source software.
PhysioNet is a public service of the Research Resource for
Complex Physiologic Signals, funded by the National Center for
Research Resources of the National Institutes of Health.  
The most recent version of this guide, and of the software it
describes, may be obtained from PhysioNet.
<LI><A HREF="http://ecg.mit.edu/">The MIT-BIH Database Distribution
Home Page</A><BR>
Information about obtaining CD-ROMs containing many of the databases
available from PhysioNet can be found here.
<LI><I><A HREF="../wpg/wpg.htm">WFDB Programmer's Guide</A></I>
<BR>
Includes tutorial and reference material relating to the WFDB library,
a portable set of functions (subroutines) for reading and writing files in the
formats supported by the applications described here.  The WFDB library may be
used with C, C++, or Fortran programs;  the guide primarily describes the C
interface.
<LI><I><A HREF="../wug/wug.htm">WAVE User's Guide</A></I><BR>
A comprehensive tutorial, with extensive reference material, for
<STRONG>WAVE</STRONG>, an interactive waveform browser with facilities for
annotation editing and control of external analysis programs.
<STRONG>WAVE</STRONG> runs on PCs under the free Linux operating system, and
on SPARC-based systems under SunOS or Solaris.
</UL>
<BR> <HR>
<P><I><ADDRESS>
<A HREF="mailto:george@mit.edu">George B. Moody (<tt>george@mit.edu</tt>)</A>
</ADDRESS></I><BR>
